QuestionId stringlengths 3 8 | QuestionTitle stringlengths 15 149 | QuestionScore int64 1 27.2k | QuestionCreatedUtc stringdate 2008-08-01 18:33:08 2025-06-16 04:59:48 | QuestionBodyHtml stringlengths 40 28.2k | QuestionViewCount int64 78 16.5M | QuestionOwnerUserId float64 4 25.2M ⌀ | QuestionLastActivityUtc stringdate 2008-09-08 19:26:01 2026-01-24 22:40:25 | AcceptedAnswerId int64 266 79.7M | AnswerScore int64 2 30.1k | AnswerCreatedUtc stringdate 2008-08-01 23:40:28 2025-06-16 05:23:39 | AnswerOwnerUserId float64 1 29.5M ⌀ | AnswerLastActivityUtc stringdate 2008-08-01 23:40:28 2026-01-23 17:46:09 | QuestionLink stringlengths 31 36 | AnswerLink stringlengths 31 36 | AnswerBodyHtml stringlengths 35 33k | AnswerBodyPreview stringlengths 35 400 | AllTagIdsCsv stringlengths 2 37 | AllTagNamesCsv stringlengths 2 106 | MergedQuestion stringlengths 74 28.4k | quality_filter stringclasses 10
values | unique_id int64 0 29k | tag_major_lang stringclasses 10
values | MergedQuestion_md stringlengths 60 28.1k | AnswerBodyHtml_md stringlengths 14 29.2k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
62969992 | Clojure: what's the way to have current time string with babashka with least dependency? | 8 | 2020-07-18 14:56:06 | <p>With the following expression,</p>
<pre><code>bb '(new java.util.Date)'
#inst "2020-07-18T14:35:16.663-00:00"
</code></pre>
<p>I want to get a string, and slightly formatted as:</p>
<pre><code>"2020-07-18 UTC 14:35:16"
</code></pre>
<p>With Babashka (bb), I wish to have the least dependency.
Othe... | 2,350 | 126,164 | 2020-07-20 00:22:39 | 62,970,721 | 15 | 2020-07-18 16:04:34 | 6,264 | 2020-07-18 16:04:34 | https://stackoverflow.com/q/62969992 | https://stackoverflow.com/a/62970721 | <p>In babashka you can use the <code>java.time</code> package:</p>
<pre class="lang-clj prettyprint-override"><code>(import 'java.time.format.DateTimeFormatter
'java.time.LocalDateTime)
(def date (LocalDateTime/now))
(def formatter (DateTimeFormatter/ofPattern "yyyy-MM-dd HH:mm:ss"))
(.format date fo... | <p>In babashka you can use the <code>java.time</code> package:</p> <pre class="lang-clj prettyprint-override"><code>(import 'java.time.format.DateTimeFormatter 'java.time.LocalDateTime) (def date (LocalDateTime/now)) (def formatter (DateTimeFormatter/ofPattern "yyyy-MM-dd HH:mm:ss")) (.format date fo... | 603, 2512, 5002, 6525, 145505 | babashka, calendar, clojure, date, time | <h1>Clojure: what's the way to have current time string with babashka with least dependency?</h1>
<p>With the following expression,</p>
<pre><code>bb '(new java.util.Date)'
#inst "2020-07-18T14:35:16.663-00:00"
</code></pre>
<p>I want to get a string, and slightly formatted as:</p>
<pre><code>"2020-07-18... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,364 | bash | # Clojure: what's the way to have current time string with babashka with least dependency?
With the following expression,
```
bb '(new java.util.Date)'
#inst "2020-07-18T14:35:16.663-00:00"
```
I want to get a string, and slightly formatted as:
```
"2020-07-18 UTC 14:35:16"
```
With Babashka (bb), I wish to have t... | In babashka you can use the `java.time` package:
```
(import 'java.time.format.DateTimeFormatter
'java.time.LocalDateTime)
(def date (LocalDateTime/now))
(def formatter (DateTimeFormatter/ofPattern "yyyy-MM-dd HH:mm:ss"))
(.format date formatter) ;;=> "2020-07-18 18:04:04"
``` |
55063570 | How to resolve variables in a Powershell script block | 8 | 2019-03-08 12:48:05 | <p>Given I have:</p>
<pre><code>$a = "world"
$b = { write-host "hello $a" }
</code></pre>
<p>How do I get the resolved text of the script block, which should be the entre string including write-host:</p>
<pre><code>write-host "hello world"
</code></pre>
<p>UPDATE: additional clarifications... | 12,327 | 3,140,853 | 2024-07-29 11:36:43 | 55,064,086 | 15 | 2019-03-08 13:19:58 | 11,025,476 | 2019-03-08 16:59:44 | https://stackoverflow.com/q/55063570 | https://stackoverflow.com/a/55064086 | <p>As in the original question, if your entire scriptblock contents is not a string (but you want it to be) and you need variable substitution within the scriptblock, you can use the following:</p>
<pre><code>$ExecutionContext.InvokeCommand.ExpandString($b)
</code></pre>
<p>Calling <code>.InvokeCommand.ExpandString($... | <p>As in the original question, if your entire scriptblock contents is not a string (but you want it to be) and you need variable substitution within the scriptblock, you can use the following:</p> <pre><code>$ExecutionContext.InvokeCommand.ExpandString($b) </code></pre> <p>Calling <code>.InvokeCommand.ExpandString($... | 526 | powershell | <h1>How to resolve variables in a Powershell script block</h1>
<p>Given I have:</p>
<pre><code>$a = "world"
$b = { write-host "hello $a" }
</code></pre>
<p>How do I get the resolved text of the script block, which should be the entre string including write-host:</p>
<pre><code>write-host "hello... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,365 | bash | # How to resolve variables in a Powershell script block
Given I have:
```
$a = "world"
$b = { write-host "hello $a" }
```
How do I get the resolved text of the script block, which should be the entre string including write-host:
```
write-host "hello world"
```
UPDATE: additional clarifications
If you just print ... | As in the original question, if your entire scriptblock contents is not a string (but you want it to be) and you need variable substitution within the scriptblock, you can use the following:
```
$ExecutionContext.InvokeCommand.ExpandString($b)
```
Calling `.InvokeCommand.ExpandString($b)` on the current execution con... |
54624827 | JQ, how to count depending on conditions? | 8 | 2019-02-11 06:10:11 | <p>Using jq, I need to <strong>get the count</strong> within an array depending on two criterias: it MUST have <code>status === 'skipped' && ref.includes(version)</code></p>
<pre><code>[
{
"id": 15484,
"sha": "52606c8da57984d1243f436e5d12e275db29a6e0",
"ref": "v1.4.15",
"status": "canceled"
... | 10,857 | 2,127,277 | 2019-02-21 20:19:40 | 54,624,970 | 15 | 2019-02-11 06:25:09 | 5,291,015 | 2019-02-11 19:48:27 | https://stackoverflow.com/q/54624827 | https://stackoverflow.com/a/54624970 | <p>Use the <code>length()</code> function at the end of the filter, after putting the objects list into an array</p>
<pre><code>jq '[.[] | select(.status == "skipped") | select(.ref | test("1\\.4\\.15"))] | length'
</code></pre>
<p>but for just returning the objects leave out the logic to get the length</p>
<pre><co... | <p>Use the <code>length()</code> function at the end of the filter, after putting the objects list into an array</p> <pre><code>jq '[.[] | select(.status == "skipped") | select(.ref | test("1\\.4\\.15"))] | length' </code></pre> <p>but for just returning the objects leave out the logic to get the length</p> <pre><co... | 58, 387, 1012, 1508, 105170 | bash, debian, jq, json, linux | <h1>JQ, how to count depending on conditions?</h1>
<p>Using jq, I need to <strong>get the count</strong> within an array depending on two criterias: it MUST have <code>status === 'skipped' && ref.includes(version)</code></p>
<pre><code>[
{
"id": 15484,
"sha": "52606c8da57984d1243f436e5d12e275db29a6e0... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,366 | bash | # JQ, how to count depending on conditions?
Using jq, I need to **get the count** within an array depending on two criterias: it MUST have `status === 'skipped' && ref.includes(version)`
```
[
{
"id": 15484,
"sha": "52606c8da57984d1243f436e5d12e275db29a6e0",
"ref": "v1.4.15",
"status": "canceled"
... | Use the `length()` function at the end of the filter, after putting the objects list into an array
```
jq '[.[] | select(.status == "skipped") | select(.ref | test("1\\.4\\.15"))] | length'
```
but for just returning the objects leave out the logic to get the length
```
jq '[.[] | select(.status == "skipped") | sele... |
53841976 | Get the date modified to be formatted with AM/PM with powershell | 8 | 2018-12-18 22:23:00 | <p>I've currently got</p>
<pre><code>Get-Item "C:\path\to\file.txt" | ForEach-Object { $_.LastWriteTime }
</code></pre>
<p>Which outputs like this</p>
<pre><code>12/18/2018 16:54:32
</code></pre>
<p>But I want it to output like this</p>
<pre><code>12/18/2018 4:54 PM
</code></pre>
<p>Is there any way I can do ... | 38,064 | 10,808,414 | 2023-02-18 00:31:29 | 53,842,101 | 15 | 2018-12-18 22:33:53 | 4,643,093 | 2023-02-18 00:31:29 | https://stackoverflow.com/q/53841976 | https://stackoverflow.com/a/53842101 | <p>Use the DateTime objects formatting. More info <a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings" rel="nofollow noreferrer">here</a></p>
<pre class="lang-bash prettyprint-override"><code>Get-Item "C:\path\to\file.txt" | ForEach-Object {
$_.LastWrit... | <p>Use the DateTime objects formatting. More info <a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings" rel="nofollow noreferrer">here</a></p> <pre class="lang-bash prettyprint-override"><code>Get-Item "C:\path\to\file.txt" | ForEach-Object { $_.LastWrit... | 526, 555, 1263 | datetime, formatting, powershell | <h1>Get the date modified to be formatted with AM/PM with powershell</h1>
<p>I've currently got</p>
<pre><code>Get-Item "C:\path\to\file.txt" | ForEach-Object { $_.LastWriteTime }
</code></pre>
<p>Which outputs like this</p>
<pre><code>12/18/2018 16:54:32
</code></pre>
<p>But I want it to output like this</p>... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,367 | bash | # Get the date modified to be formatted with AM/PM with powershell
I've currently got
```
Get-Item "C:\path\to\file.txt" | ForEach-Object { $_.LastWriteTime }
```
Which outputs like this
```
12/18/2018 16:54:32
```
But I want it to output like this
```
12/18/2018 4:54 PM
```
Is there any way I can do that? | Use the DateTime objects formatting. More info [here](https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings)
```
Get-Item "C:\path\to\file.txt" | ForEach-Object {
$_.LastWriteTime.ToString("MM/dd/yyyy hh:mm tt")
}
``` |
52293871 | powershell performance: Get-ChildItem -Include vs. Get-ChildItem | Where-Object | 8 | 2018-09-12 11:16:12 | <p>I tried a few options to iterate my directories and get a huge performance difference between the following commands:</p>
<p>Slow:</p>
<pre><code>Get-ChildItem -Directory -Force -Recurse -Depth 3 -Include '$tf'
</code></pre>
<p>Fast:</p>
<pre><code>Get-ChildItem -Directory -Force -Recurse -Depth 3 | Where-Object... | 2,518 | 7,761,156 | 2018-09-12 11:41:43 | 52,294,304 | 15 | 2018-09-12 11:41:43 | 712,649 | 2018-09-12 11:41:43 | https://stackoverflow.com/q/52293871 | https://stackoverflow.com/a/52294304 | <p><code>Get-ChildItem</code> is a provider cmdlet - that means that a bulk of its actual work is offloaded to an underlying provider, likely the <code>FileSystem</code> provider in your case.</p>
<p>The provider itself doesn't actually support the <code>-Include</code>/<code>-Exclude</code> parameters, that's one of ... | <p><code>Get-ChildItem</code> is a provider cmdlet - that means that a bulk of its actual work is offloaded to an underlying provider, likely the <code>FileSystem</code> provider in your case.</p> <p>The provider itself doesn't actually support the <code>-Include</code>/<code>-Exclude</code> parameters, that's one of ... | 526 | powershell | <h1>powershell performance: Get-ChildItem -Include vs. Get-ChildItem | Where-Object</h1>
<p>I tried a few options to iterate my directories and get a huge performance difference between the following commands:</p>
<p>Slow:</p>
<pre><code>Get-ChildItem -Directory -Force -Recurse -Depth 3 -Include '$tf'
</code></pre>
... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,368 | bash | # powershell performance: Get-ChildItem -Include vs. Get-ChildItem | Where-Object
I tried a few options to iterate my directories and get a huge performance difference between the following commands:
Slow:
```
Get-ChildItem -Directory -Force -Recurse -Depth 3 -Include '$tf'
```
Fast:
```
Get-ChildItem -Directory -... | `Get-ChildItem` is a provider cmdlet - that means that a bulk of its actual work is offloaded to an underlying provider, likely the `FileSystem` provider in your case.
The provider itself doesn't actually support the `-Include`/`-Exclude` parameters, that's one of the few things that the cmdlet takes care off - and fo... |
51183960 | How to change language/region and speech in Windows 10 with Powershell script | 8 | 2018-07-05 05:29:20 | <p>I'm trying to switch language, region and speech inside Windows 10 with a Powershell script. After the script ends, the user will be logged out and have to log in again. So everything should be changed.</p>
<p>But the region and speech is currently not changed. Does anyone know what i'm missing in the script?</p>
... | 34,353 | 6,108,697 | 2024-10-18 10:49:20 | 51,374,938 | 15 | 2018-07-17 06:50:11 | 6,108,697 | 2018-07-17 06:50:11 | https://stackoverflow.com/q/51183960 | https://stackoverflow.com/a/51374938 | <p>Found the solution. Thanks for the link to the thread. </p>
<p>To switch on german language</p>
<pre><code>Set-Culture de-DE
Set-WinSystemLocale -SystemLocale de-DE
Set-WinUILanguageOverride -Language de-DE
Set-WinUserLanguageList de-DE -Force
Set-WinHomeLocation -GeoId 94
shutdown -r;exit
</code></pre>
<p>For en... | <p>Found the solution. Thanks for the link to the thread. </p> <p>To switch on german language</p> <pre><code>Set-Culture de-DE Set-WinSystemLocale -SystemLocale de-DE Set-WinUILanguageOverride -Language de-DE Set-WinUserLanguageList de-DE -Force Set-WinHomeLocation -GeoId 94 shutdown -r;exit </code></pre> <p>For en... | 526, 9013, 106599, 107329 | cortana, environment-variables, powershell, windows-10 | <h1>How to change language/region and speech in Windows 10 with Powershell script</h1>
<p>I'm trying to switch language, region and speech inside Windows 10 with a Powershell script. After the script ends, the user will be logged out and have to log in again. So everything should be changed.</p>
<p>But the region and ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,369 | bash | # How to change language/region and speech in Windows 10 with Powershell script
I'm trying to switch language, region and speech inside Windows 10 with a Powershell script. After the script ends, the user will be logged out and have to log in again. So everything should be changed.
But the region and speech is curren... | Found the solution. Thanks for the link to the thread.
To switch on german language
```
Set-Culture de-DE
Set-WinSystemLocale -SystemLocale de-DE
Set-WinUILanguageOverride -Language de-DE
Set-WinUserLanguageList de-DE -Force
Set-WinHomeLocation -GeoId 94
shutdown -r;exit
```
For en-US use following lines
```
Set-Cu... |
50986354 | Execute python program from command line without script file | 8 | 2018-06-22 10:54:02 | <p>I want to execute a python program on a remote server, without creating a script. The remote server does not allow me to create any files anywhere on the file system.</p>
<p>The python program has following structure, though the functions are a lot more complicated</p>
<pre><code>def test2():
print("test2")
def... | 10,803 | 414,939 | 2022-04-11 21:36:56 | 50,986,737 | 15 | 2018-06-22 11:15:49 | 7,003,620 | 2021-03-28 18:41:30 | https://stackoverflow.com/q/50986354 | https://stackoverflow.com/a/50986737 | <p>i found a solution, maybe it will help, you can use <code>EOF</code></p>
<pre><code>$ python << EOF
> def test2():
> print("test2")
>
> def test_func():
> test2()
> print("test_func")
>
> test_func()
> EOF
# output
test2
test_func
</code></pre>
<p>You can... | <p>i found a solution, maybe it will help, you can use <code>EOF</code></p> <pre><code>$ python << EOF > def test2(): > print("test2") > > def test_func(): > test2() > print("test_func") > > test_func() > EOF # output test2 test_func </code></pre> <p>You can... | 16, 387 | bash, python | <h1>Execute python program from command line without script file</h1>
<p>I want to execute a python program on a remote server, without creating a script. The remote server does not allow me to create any files anywhere on the file system.</p>
<p>The python program has following structure, though the functions are a l... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,370 | bash | # Execute python program from command line without script file
I want to execute a python program on a remote server, without creating a script. The remote server does not allow me to create any files anywhere on the file system.
The python program has following structure, though the functions are a lot more complica... | i found a solution, maybe it will help, you can use `EOF`
```
$ python << EOF
> def test2():
> print("test2")
>
> def test_func():
> test2()
> print("test_func")
>
> test_func()
> EOF
# output
test2
test_func
```
You can also use `python -c` with `"""`
```
$ python -c """
def test2():
print("test2")
def ... |
49835860 | Fastest Way to Create a File With Random Data | 8 | 2018-04-14 20:25:55 | <p>I have a requirement to create files of a specified size filled with random data.
I can't use any third party tools to achieve this so all I have at my disposal is all the Powershell commands.</p>
<p>What I have here works well with small files ranging in size from 1 KB to a 30 KB.
It doesn't scale well when the f... | 8,269 | 4,020,238 | 2018-10-10 10:46:51 | 49,836,223 | 15 | 2018-04-14 21:07:49 | 52,598 | 2018-04-15 21:29:45 | https://stackoverflow.com/q/49835860 | https://stackoverflow.com/a/49836223 | <p>Following writes a set of random bytes to a file and is still pretty fast</p>
<p><strong>Edit</strong><br>
<sub>Kudos to Tom Blodget for pointing out an issue in decoding/encoding</sub></p>
<pre><code>$bytes = 10MB
[System.Security.Cryptography.RNGCryptoServiceProvider] $rng = New-Object System.Security.Cryptogra... | <p>Following writes a set of random bytes to a file and is still pretty fast</p> <p><strong>Edit</strong><br> <sub>Kudos to Tom Blodget for pointing out an issue in decoding/encoding</sub></p> <pre><code>$bytes = 10MB [System.Security.Cryptography.RNGCryptoServiceProvider] $rng = New-Object System.Security.Cryptogra... | 526 | powershell | <h1>Fastest Way to Create a File With Random Data</h1>
<p>I have a requirement to create files of a specified size filled with random data.
I can't use any third party tools to achieve this so all I have at my disposal is all the Powershell commands.</p>
<p>What I have here works well with small files ranging in size... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,371 | bash | # Fastest Way to Create a File With Random Data
I have a requirement to create files of a specified size filled with random data.
I can't use any third party tools to achieve this so all I have at my disposal is all the Powershell commands.
What I have here works well with small files ranging in size from 1 KB to a 3... | Following writes a set of random bytes to a file and is still pretty fast
**Edit**
Kudos to Tom Blodget for pointing out an issue in decoding/encoding
```
$bytes = 10MB
[System.Security.Cryptography.RNGCryptoServiceProvider] $rng = New-Object System.Security.Cryptography.RNGCryptoServiceProvider
$rndbytes = New-Ob... |
44368990 | How do I get properties that ONLY have populated values? | 8 | 2017-06-05 12:30:20 | <p>How do I get properties that ONLY have populated values?</p>
<p>So for example if I run</p>
<pre><code>Get-QADUser -Identity "SomeOne" -IncludeAllProperties
</code></pre>
<p>the output would of course include.. all properties, including those with and those without values. I want a listing of properties with valu... | 20,059 | 6,537,651 | 2023-07-22 13:09:05 | 44,370,775 | 15 | 2017-06-05 14:02:45 | 5,771,128 | 2017-06-05 14:02:45 | https://stackoverflow.com/q/44368990 | https://stackoverflow.com/a/44370775 | <p>You could try using the built-in (hidden) property of PowerShell objects called <strong>PSObject</strong>, which includes a property called <strong>Properties</strong>, i.e. a list of all properties on the parent object.</p>
<p>Maybe easier with an example. Take <code>Get-Process</code>... a process can have many a... | <p>You could try using the built-in (hidden) property of PowerShell objects called <strong>PSObject</strong>, which includes a property called <strong>Properties</strong>, i.e. a list of all properties on the parent object.</p> <p>Maybe easier with an example. Take <code>Get-Process</code>... a process can have many a... | 526, 18663 | powershell, quest | <h1>How do I get properties that ONLY have populated values?</h1>
<p>How do I get properties that ONLY have populated values?</p>
<p>So for example if I run</p>
<pre><code>Get-QADUser -Identity "SomeOne" -IncludeAllProperties
</code></pre>
<p>the output would of course include.. all properties, including those with ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,372 | bash | # How do I get properties that ONLY have populated values?
How do I get properties that ONLY have populated values?
So for example if I run
```
Get-QADUser -Identity "SomeOne" -IncludeAllProperties
```
the output would of course include.. all properties, including those with and those without values. I want a listi... | You could try using the built-in (hidden) property of PowerShell objects called **PSObject**, which includes a property called **Properties**, i.e. a list of all properties on the parent object.
Maybe easier with an example. Take `Get-Process`... a process can have many attributes (properties) with or without values. ... |
41733251 | os.chdir() to relative home directory (/home/usr/) | 8 | 2017-01-19 03:34:03 | <p>Is there a way to use os.chdir() to go to relative user folder?</p>
<p>I'm making a bash and the only issue I found is the <code>cd ~</code>, <code>arg[0]</code> is undefined since I'm using this cd functions:</p>
<pre><code>def cd(args):
os.chdir(args[0])
return current_status
</code></pre>
<p>Which I wa... | 10,265 | 3,431,636 | 2017-01-19 03:36:25 | 41,733,276 | 15 | 2017-01-19 03:36:25 | 82,294 | 2017-01-19 03:36:25 | https://stackoverflow.com/q/41733251 | https://stackoverflow.com/a/41733276 | <p>No, <code>os.chdir</code> won't do that, since it is just a thin wrapper around a system call. Consider that <code>~</code> is actually a legal name for a directory.</p>
<p>You can, however, use <code>os.expanduser</code> to expand <code>~</code> in a path.</p>
<pre><code>def cd(path):
os.chdir(os.path.expand... | <p>No, <code>os.chdir</code> won't do that, since it is just a thin wrapper around a system call. Consider that <code>~</code> is actually a legal name for a directory.</p> <p>You can, however, use <code>os.expanduser</code> to expand <code>~</code> in a path.</p> <pre><code>def cd(path): os.chdir(os.path.expand... | 16, 387, 390, 36377 | bash, chdir, python, shell | <h1>os.chdir() to relative home directory (/home/usr/)</h1>
<p>Is there a way to use os.chdir() to go to relative user folder?</p>
<p>I'm making a bash and the only issue I found is the <code>cd ~</code>, <code>arg[0]</code> is undefined since I'm using this cd functions:</p>
<pre><code>def cd(args):
os.chdir(arg... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,373 | bash | # os.chdir() to relative home directory (/home/usr/)
Is there a way to use os.chdir() to go to relative user folder?
I'm making a bash and the only issue I found is the `cd ~`, `arg[0]` is undefined since I'm using this cd functions:
```
def cd(args):
os.chdir(args[0])
return current_status
```
Which I want... | No, `os.chdir` won't do that, since it is just a thin wrapper around a system call. Consider that `~` is actually a legal name for a directory.
You can, however, use `os.expanduser` to expand `~` in a path.
```
def cd(path):
os.chdir(os.path.expanduser(path))
```
Note that this will also expand `~user` to the ho... |
40593740 | Can namerefs (declare -n) be used with arrays in bash? What does the documentation mean when it says declare -n cannot be applied to arrays? | 8 | 2016-11-14 16:43:47 | <p>In another question to stackoverflow, I asked how to pass array to a function. An answer recommended me a previous answers.
One answer suggests that declare with -n option, referencing, is useful to pass array to an function, like following,</p>
<pre><code>declare -a array=( 1 2 )
function array_pass_by_referen... | 5,445 | 5,396,302 | 2023-02-12 12:06:11 | 40,593,912 | 15 | 2016-11-14 16:54:19 | 45,375 | 2016-11-14 19:27:51 | https://stackoverflow.com/q/40593740 | https://stackoverflow.com/a/40593912 | <p>Further down on the <code>man</code> page, under the <code>PARAMETERS</code> heading, it also says: </p>
<blockquote>
<p>However, nameref variables can reference array variables and subscripted array variables.</p>
</blockquote>
<p>In other words:</p>
<ul>
<li>You can't declare a nameref variable <em>itself<... | <p>Further down on the <code>man</code> page, under the <code>PARAMETERS</code> heading, it also says: </p> <blockquote> <p>However, nameref variables can reference array variables and subscripted array variables.</p> </blockquote> <p>In other words:</p> <ul> <li>You can't declare a nameref variable <em>itself<... | 387 | bash | <h1>Can namerefs (declare -n) be used with arrays in bash? What does the documentation mean when it says declare -n cannot be applied to arrays?</h1>
<p>In another question to stackoverflow, I asked how to pass array to a function. An answer recommended me a previous answers.
One answer suggests that declare with -n... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,374 | bash | # Can namerefs (declare -n) be used with arrays in bash? What does the documentation mean when it says declare -n cannot be applied to arrays?
In another question to stackoverflow, I asked how to pass array to a function. An answer recommended me a previous answers.
One answer suggests that declare with -n option, ref... | Further down on the `man` page, under the `PARAMETERS` heading, it also says:
> However, nameref variables can reference array variables and subscripted array variables.
In other words:
- You can't declare a nameref variable *itself* as an array (`declare -a -n foo=...` will result in a syntax error).
- But a namere... |
38336329 | ls not updating to reflect new files? | 8 | 2016-07-12 18:22:40 | <p>I am running a program that creates a bunch of files in a certain directory, and I want to watch the files get created.</p>
<p>I open two terminal windows and cd one of them (call it terminal A) to the directory of the program (so I can run it) and the other (terminal B) to the directory where the output files get ... | 4,119 | 2,049,443 | 2016-07-12 18:45:56 | 38,336,580 | 15 | 2016-07-12 18:40:00 | 6,580,940 | 2016-07-12 18:45:56 | https://stackoverflow.com/q/38336329 | https://stackoverflow.com/a/38336580 | <p>This sequence of events seems to reproduce the issue.</p>
<p><img src="https://i.sstatic.net/BOmgH.png" alt="image"></p>
<p>Your program in terminal A probably deletes terminal B's current directory and then recreates it with the same name, so <code>ls</code> doesn't work since that particular directory that was o... | <p>This sequence of events seems to reproduce the issue.</p> <p><img src="https://i.sstatic.net/BOmgH.png" alt="image"></p> <p>Your program in terminal A probably deletes terminal B's current directory and then recreates it with the same name, so <code>ls</code> doesn't work since that particular directory that was o... | 58, 387, 3589, 5310 | bash, file, linux, ls | <h1>ls not updating to reflect new files?</h1>
<p>I am running a program that creates a bunch of files in a certain directory, and I want to watch the files get created.</p>
<p>I open two terminal windows and cd one of them (call it terminal A) to the directory of the program (so I can run it) and the other (terminal ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,375 | bash | # ls not updating to reflect new files?
I am running a program that creates a bunch of files in a certain directory, and I want to watch the files get created.
I open two terminal windows and cd one of them (call it terminal A) to the directory of the program (so I can run it) and the other (terminal B) to the direct... | This sequence of events seems to reproduce the issue.
Your program in terminal A probably deletes terminal B's current directory and then recreates it with the same name, so `ls` doesn't work since that particular directory that was originally `cd`'d to by terminal B doesn't ... |
38233988 | Automatically reword all rebased commits | 8 | 2016-07-06 21:22:05 | <p>I want to be able to touch up my commit messages before I push them to my remote, but I want to automatically do that.</p>
<p>I can reword all my additional commits by doing</p>
<pre><code>git rebase -i origin/master
</code></pre>
<p>This brings up an editor where I can change all the commits from <code>pick</cod... | 3,017 | 6,194,839 | 2022-06-24 10:06:56 | 38,234,236 | 15 | 2016-07-06 21:40:09 | 6,541,288 | 2016-07-06 21:40:09 | https://stackoverflow.com/q/38233988 | https://stackoverflow.com/a/38234236 | <p>Since the question is a bit vague on the nature of edits, these are just cues on what you could do.</p>
<blockquote>
<p>I don't want to have to change every commit to reword.</p>
</blockquote>
<p>You could change the editor used by <code>git-rebase -i</code> with <code>git config sequence.editor 'sed -i s/pick/r... | <p>Since the question is a bit vague on the nature of edits, these are just cues on what you could do.</p> <blockquote> <p>I don't want to have to change every commit to reword.</p> </blockquote> <p>You could change the editor used by <code>git-rebase -i</code> with <code>git config sequence.editor 'sed -i s/pick/r... | 119, 387 | bash, git | <h1>Automatically reword all rebased commits</h1>
<p>I want to be able to touch up my commit messages before I push them to my remote, but I want to automatically do that.</p>
<p>I can reword all my additional commits by doing</p>
<pre><code>git rebase -i origin/master
</code></pre>
<p>This brings up an editor where... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,376 | bash | # Automatically reword all rebased commits
I want to be able to touch up my commit messages before I push them to my remote, but I want to automatically do that.
I can reword all my additional commits by doing
```
git rebase -i origin/master
```
This brings up an editor where I can change all the commits from `pick... | Since the question is a bit vague on the nature of edits, these are just cues on what you could do.
> I don't want to have to change every commit to reword.
You could change the editor used by `git-rebase -i` with `git config sequence.editor 'sed -i s/pick/reword/'`, so that no editor pops for the rebase-todo, and pi... |
36625593 | How to get the complete calling command of a BASH script from inside the script (not just the arguments) | 8 | 2016-04-14 14:05:27 | <p>I have a BASH script that has a long set of arguments and two ways of calling it: </p>
<pre><code>my_script --option1 value --option2 value ... etc
</code></pre>
<p>or </p>
<pre><code>my_script val1 val2 val3 ..... valn
</code></pre>
<p>This script in turn compiles and runs a large FORTRAN code suite that e... | 11,942 | 6,068,294 | 2016-04-15 15:10:54 | 36,625,791 | 15 | 2016-04-14 14:12:51 | 45,375 | 2016-04-15 15:10:54 | https://stackoverflow.com/q/36625593 | https://stackoverflow.com/a/36625791 | <p>You can try the following:</p>
<pre><code>myInvocation="$(printf %q "$BASH_SOURCE")$((($#)) && printf ' %q' "$@")"
</code></pre>
<p><code>$BASH_SOURCE</code> refers to the running script (as invoked), and <code>$@</code> is the array of arguments; <code>(($#)) &&</code> ensures that the following <... | <p>You can try the following:</p> <pre><code>myInvocation="$(printf %q "$BASH_SOURCE")$((($#)) && printf ' %q' "$@")" </code></pre> <p><code>$BASH_SOURCE</code> refers to the running script (as invoked), and <code>$@</code> is the array of arguments; <code>(($#)) &&</code> ensures that the following <... | 58, 387, 390 | bash, linux, shell | <h1>How to get the complete calling command of a BASH script from inside the script (not just the arguments)</h1>
<p>I have a BASH script that has a long set of arguments and two ways of calling it: </p>
<pre><code>my_script --option1 value --option2 value ... etc
</code></pre>
<p>or </p>
<pre><code>my_script val... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,377 | bash | # How to get the complete calling command of a BASH script from inside the script (not just the arguments)
I have a BASH script that has a long set of arguments and two ways of calling it:
```
my_script --option1 value --option2 value ... etc
```
or
```
my_script val1 val2 val3 ..... valn
```
This script in turn... | You can try the following:
```
myInvocation="$(printf %q "$BASH_SOURCE")$((($#)) && printf ' %q' "$@")"
```
`$BASH_SOURCE` refers to the running script (as invoked), and `$@` is the array of arguments; `(($#)) &&` ensures that the following `printf` command is only executed if at least 1 argument was passed; `printf ... |
36346817 | Powershell "private" scope seems not useful at all | 8 | 2016-04-01 02:01:24 | <p>I've got the script below, from internet:</p>
<pre><code>$private:a = 1
Function test {
"variable a contains $a"
$a = 2
"variable a contains $a"
}
test
</code></pre>
<p>It prints 2. No problem. If I delete "private", like below:</p>
<pre><code>$a = 1
Function test {
"variable a contains $a"
... | 9,316 | 4,927,124 | 2022-11-12 21:10:12 | 36,352,633 | 15 | 2016-04-01 09:26:20 | 4,003,407 | 2016-04-01 14:49:06 | https://stackoverflow.com/q/36346817 | https://stackoverflow.com/a/36352633 | <p>Private scope can be useful when writing a function that invokes a user-supplied callback. Consider this simple example:</p>
<pre><code>filter Where-Name {
param(
[ScriptBlock]$Condition
)
$FirstName, $LastName = $_ -split ' '
if(&$Condition $FirstName $LastName) {
$_
}
}
</c... | <p>Private scope can be useful when writing a function that invokes a user-supplied callback. Consider this simple example:</p> <pre><code>filter Where-Name { param( [ScriptBlock]$Condition ) $FirstName, $LastName = $_ -split ' ' if(&$Condition $FirstName $LastName) { $_ } } </c... | 526, 2182, 4943 | powershell, private, scope | <h1>Powershell "private" scope seems not useful at all</h1>
<p>I've got the script below, from internet:</p>
<pre><code>$private:a = 1
Function test {
"variable a contains $a"
$a = 2
"variable a contains $a"
}
test
</code></pre>
<p>It prints 2. No problem. If I delete "private", like below:</p>
<pre><co... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,378 | bash | # Powershell "private" scope seems not useful at all
I've got the script below, from internet:
```
$private:a = 1
Function test {
"variable a contains $a"
$a = 2
"variable a contains $a"
}
test
```
It prints 2. No problem. If I delete "private", like below:
```
$a = 1
Function test {
"variable a c... | Private scope can be useful when writing a function that invokes a user-supplied callback. Consider this simple example:
```
filter Where-Name {
param(
[ScriptBlock]$Condition
)
$FirstName, $LastName = $_ -split ' '
if(&$Condition $FirstName $LastName) {
$_
}
}
```
Then, if someone... |
34246819 | "sh: : unknown operand" in Yocto | 8 | 2015-12-13 00:52:19 | <p>The following works in Ubuntu but not Yocto (Poky).</p>
<pre><code>root@system:~/# x='abc'
root@system:~/# y=''
root@system:~/# [[ $(echo $x) != '' ]] && echo true
true
root@system:~/# [[ $(echo $y) != '' ]] && echo true
sh: : unknown operand
</code></pre>
<p>In Ubuntu the last line returns nothing... | 44,860 | 1,156,245 | 2015-12-13 16:23:54 | 34,251,849 | 15 | 2015-12-13 13:53:32 | 4,687,135 | 2015-12-13 13:53:32 | https://stackoverflow.com/q/34246819 | https://stackoverflow.com/a/34251849 | <p>The problem seems to be that <code>$(echo $y)</code> is expanding to an empty string, and then <code>[[</code> isn't handling it correctly. The solution to that would be to quote the command substitution like</p>
<pre><code>[[ "$(echo "$y")" != '' ]] && echo true
</code></pre>
<p>though it's probably bett... | <p>The problem seems to be that <code>$(echo $y)</code> is expanding to an empty string, and then <code>[[</code> isn't handling it correctly. The solution to that would be to quote the command substitution like</p> <pre><code>[[ "$(echo "$y")" != '' ]] && echo true </code></pre> <p>though it's probably bett... | 390, 104267 | shell, yocto | <h1>"sh: : unknown operand" in Yocto</h1>
<p>The following works in Ubuntu but not Yocto (Poky).</p>
<pre><code>root@system:~/# x='abc'
root@system:~/# y=''
root@system:~/# [[ $(echo $x) != '' ]] && echo true
true
root@system:~/# [[ $(echo $y) != '' ]] && echo true
sh: : unknown operand
</code></pre>
... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,379 | bash | # "sh: : unknown operand" in Yocto
The following works in Ubuntu but not Yocto (Poky).
```
root@system:~/# x='abc'
root@system:~/# y=''
root@system:~/# [[ $(echo $x) != '' ]] && echo true
true
root@system:~/# [[ $(echo $y) != '' ]] && echo true
sh: : unknown operand
```
In Ubuntu the last line returns nothing (as ex... | The problem seems to be that `$(echo $y)` is expanding to an empty string, and then `[[` isn't handling it correctly. The solution to that would be to quote the command substitution like
```
[[ "$(echo "$y")" != '' ]] && echo true
```
though it's probably better still to use [printf than echo](https://unix.stackexcha... |
32169795 | Git for Windows, run git bash without mintty? | 8 | 2015-08-23 18:05:33 | <p>After upgrading my PC to Windows 10 and doing a reset, I had to redownload all of my programs. When I downloaded Git for Windows, it came with a newer version compared to what I used before. This version looks to use mintty for the terminal, which doesn't seem to support using arrow keys to scroll through options ... | 11,461 | 1,795,832 | 2016-02-23 07:17:11 | 32,328,351 | 15 | 2015-09-01 09:43:11 | 1,539,872 | 2015-09-01 09:43:11 | https://stackoverflow.com/q/32169795 | https://stackoverflow.com/a/32328351 | <p>I'm using <a href="http://sourceforge.net/projects/console/">console2</a> to display my different <code>cmd.exe</code> and <code>bash</code> windows in tabs, so I ran into the same problem. The way I solved it was to call <code>cmd.exe</code> and have it launch the git <code>bash</code>. That seems to do the trick... | <p>I'm using <a href="http://sourceforge.net/projects/console/">console2</a> to display my different <code>cmd.exe</code> and <code>bash</code> windows in tabs, so I ran into the same problem. The way I solved it was to call <code>cmd.exe</code> and have it launch the git <code>bash</code>. That seems to do the trick... | 119, 61874 | git, git-bash | <h1>Git for Windows, run git bash without mintty?</h1>
<p>After upgrading my PC to Windows 10 and doing a reset, I had to redownload all of my programs. When I downloaded Git for Windows, it came with a newer version compared to what I used before. This version looks to use mintty for the terminal, which doesn't seem... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,380 | bash | # Git for Windows, run git bash without mintty?
After upgrading my PC to Windows 10 and doing a reset, I had to redownload all of my programs. When I downloaded Git for Windows, it came with a newer version compared to what I used before. This version looks to use mintty for the terminal, which doesn't seem to support... | I'm using [console2](http://sourceforge.net/projects/console/) to display my different `cmd.exe` and `bash` windows in tabs, so I ran into the same problem. The way I solved it was to call `cmd.exe` and have it launch the git `bash`. That seems to do the trick for me. So configure your tool(s) to use a shell like that:... |
30452699 | make bash script display system event dialog, then take its result and use it in an if statement | 8 | 2015-05-26 07:54:16 | <p>I'm on macOS. I have a script that, after asking for confirmation using <code>read</code> in Terminal, uses <code>grep</code> to check whether /dev/disk1 is mounted, then formats that disk. That's a dangerous script, hence why asking if it's okay first is vital.</p>
<p>Eventually, I would like to have this script b... | 8,027 | 4,939,413 | 2018-06-27 07:02:40 | 30,464,956 | 15 | 2015-05-26 17:16:59 | 438,157 | 2015-05-26 17:16:59 | https://stackoverflow.com/q/30452699 | https://stackoverflow.com/a/30464956 | <p>Yes, it is possible in bash to take the output of an osascript dialog. Here’s an example with a Yes/No dialog box:</p>
<pre><code>#!/bin/bash
SURETY="$(osascript -e 'display dialog "Are you sure you want to partition this disk?" buttons {"Yes", "No"} default button "No"')"
if [ "$SURETY" = "button returned:Yes" ]... | <p>Yes, it is possible in bash to take the output of an osascript dialog. Here’s an example with a Yes/No dialog box:</p> <pre><code>#!/bin/bash SURETY="$(osascript -e 'display dialog "Are you sure you want to partition this disk?" buttons {"Yes", "No"} default button "No"')" if [ "$SURETY" = "button returned:Yes" ]... | 369, 387, 390, 1243 | applescript, bash, macos, shell | <h1>make bash script display system event dialog, then take its result and use it in an if statement</h1>
<p>I'm on macOS. I have a script that, after asking for confirmation using <code>read</code> in Terminal, uses <code>grep</code> to check whether /dev/disk1 is mounted, then formats that disk. That's a dangerous sc... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,381 | bash | # make bash script display system event dialog, then take its result and use it in an if statement
I'm on macOS. I have a script that, after asking for confirmation using `read` in Terminal, uses `grep` to check whether /dev/disk1 is mounted, then formats that disk. That's a dangerous script, hence why asking if it's ... | Yes, it is possible in bash to take the output of an osascript dialog. Here’s an example with a Yes/No dialog box:
```
#!/bin/bash
SURETY="$(osascript -e 'display dialog "Are you sure you want to partition this disk?" buttons {"Yes", "No"} default button "No"')"
if [ "$SURETY" = "button returned:Yes" ]; then
ech... |
29119383 | PowerShell use regular expression to split a string | 8 | 2015-03-18 10:19:19 | <p>This is my code:</p>
<pre><code>[regex]::split("1,2 3", '(,|\s)+')
</code></pre>
<p>What I want is an array with three elements <code>1, 2, 3</code>, however, what I got it is an array with five elements.</p>
<pre><code>PS C:\Users\a> [regex]::split("1,2 3", '(,|\s)+').Length
5
PS C:\Users\a>
</code></p... | 48,732 | 170,931 | 2022-01-31 04:11:49 | 29,120,112 | 15 | 2015-03-18 10:54:36 | 3,829,407 | 2020-05-04 22:11:08 | https://stackoverflow.com/q/29119383 | https://stackoverflow.com/a/29120112 | <p>In PowerShell when you use a <code>-split</code> function if you have part of the match in brackets <code>()</code> you are asking for that match to be returned as well. I am sure that the same is true with the static method of <code>[regex]</code> as well. Consider the output from the two following commands (which ... | <p>In PowerShell when you use a <code>-split</code> function if you have part of the match in brackets <code>()</code> you are asking for that match to be returned as well. I am sure that the same is true with the static method of <code>[regex]</code> as well. Consider the output from the two following commands (which ... | 18, 526, 2193 | powershell, regex, split | <h1>PowerShell use regular expression to split a string</h1>
<p>This is my code:</p>
<pre><code>[regex]::split("1,2 3", '(,|\s)+')
</code></pre>
<p>What I want is an array with three elements <code>1, 2, 3</code>, however, what I got it is an array with five elements.</p>
<pre><code>PS C:\Users\a> [regex]::spli... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,382 | bash | # PowerShell use regular expression to split a string
This is my code:
```
[regex]::split("1,2 3", '(,|\s)+')
```
What I want is an array with three elements `1, 2, 3`, however, what I got it is an array with five elements.
```
PS C:\Users\a> [regex]::split("1,2 3", '(,|\s)+').Length
5
PS C:\Users\a>
```
How t... | In PowerShell when you use a `-split` function if you have part of the match in brackets `()` you are asking for that match to be returned as well. I am sure that the same is true with the static method of `[regex]` as well. Consider the output from the two following commands (which are similar to yours) and you will s... |
28966977 | Get only the drive letter from a path in PowerShell | 8 | 2015-03-10 14:55:56 | <p>I want to make a script in PowerShell to help easily translate a path like this:</p>
<pre><code>H:\MyDoc.docx
</code></pre>
<p>Into its true absolute path, like this:</p>
<pre><code>\\FileServer\UserShares\Organization\Department\Me\MyDoc.docx
</code></pre>
<p>In this case, I've created a network drive mapping o... | 28,059 | 477,682 | 2017-08-09 17:03:19 | 28,967,236 | 15 | 2015-03-10 15:06:57 | 3,115,685 | 2015-03-10 15:14:40 | https://stackoverflow.com/q/28966977 | https://stackoverflow.com/a/28967236 | <p>You could use the <code>PSDrive</code> property of the FileInfo object:</p>
<pre><code>(Get-Item .\your\path\to\file.ext).PSDrive.Name
</code></pre>
| <p>You could use the <code>PSDrive</code> property of the FileInfo object:</p> <pre><code>(Get-Item .\your\path\to\file.ext).PSDrive.Name </code></pre> | 526 | powershell | <h1>Get only the drive letter from a path in PowerShell</h1>
<p>I want to make a script in PowerShell to help easily translate a path like this:</p>
<pre><code>H:\MyDoc.docx
</code></pre>
<p>Into its true absolute path, like this:</p>
<pre><code>\\FileServer\UserShares\Organization\Department\Me\MyDoc.docx
</code></... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,383 | bash | # Get only the drive letter from a path in PowerShell
I want to make a script in PowerShell to help easily translate a path like this:
```
H:\MyDoc.docx
```
Into its true absolute path, like this:
```
\\FileServer\UserShares\Organization\Department\Me\MyDoc.docx
```
In this case, I've created a network drive mappi... | You could use the `PSDrive` property of the FileInfo object:
```
(Get-Item .\your\path\to\file.ext).PSDrive.Name
``` |
27356095 | How can I stop the Powershell command `Get-NetFirewallRule` from throwing an error? | 8 | 2014-12-08 10:39:30 | <p>I'm trying to determine if a firewall rule exists or not, with Powershell.</p>
<p>If the rule does <em>not</em> exist, I get an ugly error message. If it does exist, all is good :)</p>
<p>How can I check if the rule exists without any ugly red error message occuring?</p>
<p>eg.</p>
<pre><code>Import-Module NetSe... | 5,015 | 30,674 | 2014-12-08 10:51:15 | 27,356,180 | 15 | 2014-12-08 10:44:01 | 3,115,685 | 2014-12-08 10:51:15 | https://stackoverflow.com/q/27356095 | https://stackoverflow.com/a/27356180 | <p>Populate the <code>-ErrorAction</code> parameter for the cmdlet</p>
<p><code>Get-NetFirewallRule -DisplayName $name -ErrorAction SilentlyContinue</code></p>
<p>At this point you can test the result of the last command using <code>$?</code>. If the rule exists, this will return <code>$true</code>.</p>
<p>Alternati... | <p>Populate the <code>-ErrorAction</code> parameter for the cmdlet</p> <p><code>Get-NetFirewallRule -DisplayName $name -ErrorAction SilentlyContinue</code></p> <p>At this point you can test the result of the last command using <code>$?</code>. If the rule exists, this will return <code>$true</code>.</p> <p>Alternati... | 526, 2045 | firewall, powershell | <h1>How can I stop the Powershell command `Get-NetFirewallRule` from throwing an error?</h1>
<p>I'm trying to determine if a firewall rule exists or not, with Powershell.</p>
<p>If the rule does <em>not</em> exist, I get an ugly error message. If it does exist, all is good :)</p>
<p>How can I check if the rule exists... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,384 | bash | # How can I stop the Powershell command `Get-NetFirewallRule` from throwing an error?
I'm trying to determine if a firewall rule exists or not, with Powershell.
If the rule does *not* exist, I get an ugly error message. If it does exist, all is good :)
How can I check if the rule exists without any ugly red error me... | Populate the `-ErrorAction` parameter for the cmdlet
`Get-NetFirewallRule -DisplayName $name -ErrorAction SilentlyContinue`
At this point you can test the result of the last command using `$?`. If the rule exists, this will return `$true`.
Alternatively, you can use a try / catch block:
```
try {
Get-NetFirewallR... |
25732814 | PowerShell can't use the matching enum type? | 8 | 2014-09-08 20:39:44 | <p>Am I doing something stupid here?</p>
<p>I specify that a function takes a particular enum type as an argument:</p>
<pre><code>PS> add-type -AssemblyName System.ServiceProcess
PS> function test([System.ServiceProcess.ServiceControllerStatus]$x) { Write-host $x $x.gettype() }
</code></pre>
<p>The type is mos... | 7,807 | 1,394,393 | 2020-08-31 19:10:25 | 25,733,351 | 15 | 2014-09-08 21:25:00 | 2,797,457 | 2020-08-31 19:10:25 | https://stackoverflow.com/q/25732814 | https://stackoverflow.com/a/25733351 | <p>You are running into a small gotcha regarding parsing modes. You can put parens around the argument and it will work:</p>
<pre><code>test ([System.ServiceProcess.ServiceControllerStatus]::Stopped)
</code></pre>
<p>Alternatively, conversions from string to enum happen naturally, so you could write:</p>
<pre><code>te... | <p>You are running into a small gotcha regarding parsing modes. You can put parens around the argument and it will work:</p> <pre><code>test ([System.ServiceProcess.ServiceControllerStatus]::Stopped) </code></pre> <p>Alternatively, conversions from string to enum happen naturally, so you could write:</p> <pre><code>te... | 360, 526, 1078, 1926 | enums, parameters, powershell, types | <h1>PowerShell can't use the matching enum type?</h1>
<p>Am I doing something stupid here?</p>
<p>I specify that a function takes a particular enum type as an argument:</p>
<pre><code>PS> add-type -AssemblyName System.ServiceProcess
PS> function test([System.ServiceProcess.ServiceControllerStatus]$x) { Write-ho... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,385 | bash | # PowerShell can't use the matching enum type?
Am I doing something stupid here?
I specify that a function takes a particular enum type as an argument:
```
PS> add-type -AssemblyName System.ServiceProcess
PS> function test([System.ServiceProcess.ServiceControllerStatus]$x) { Write-host $x $x.gettype() }
```
The typ... | You are running into a small gotcha regarding parsing modes. You can put parens around the argument and it will work:
```
test ([System.ServiceProcess.ServiceControllerStatus]::Stopped)
```
Alternatively, conversions from string to enum happen naturally, so you could write:
```
test Stopped
```
Here are a couple go... |
25062341 | How to run multiple jar files at once using shell script? | 8 | 2014-07-31 15:01:31 | <p><a href="https://stackoverflow.com/questions/14554786/batch-script-run-multiple-jar-files-at-once/14556024#14556024">Similar question</a> related to Batch script has an answer. But I need same in shell script.</p>
| 14,846 | 3,485,172 | 2019-09-17 11:44:42 | 25,062,541 | 15 | 2014-07-31 15:08:58 | 1,174,332 | 2014-07-31 15:08:58 | https://stackoverflow.com/q/25062341 | https://stackoverflow.com/a/25062541 | <p>Just launch your jar adding a & at the end
Example : </p>
<pre><code>#!/bin/bash
java -jar myjar1.jar &
java -jar myjar2.jar &
java -jar myjar3.jar &
</code></pre>
<p>If you want the jar keep running after closing the terminal, use nohup : </p>
<pre><code>#!/bin/bash
nohup java -jar myjar1.jar &... | <p>Just launch your jar adding a & at the end Example : </p> <pre><code>#!/bin/bash java -jar myjar1.jar & java -jar myjar2.jar & java -jar myjar3.jar & </code></pre> <p>If you want the jar keep running after closing the terminal, use nohup : </p> <pre><code>#!/bin/bash nohup java -jar myjar1.jar &... | 390, 7002 | batch-file, shell | <h1>How to run multiple jar files at once using shell script?</h1>
<p><a href="https://stackoverflow.com/questions/14554786/batch-script-run-multiple-jar-files-at-once/14556024#14556024">Similar question</a> related to Batch script has an answer. But I need same in shell script.</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,386 | bash | # How to run multiple jar files at once using shell script?
[Similar question](https://stackoverflow.com/questions/14554786/batch-script-run-multiple-jar-files-at-once/14556024#14556024) related to Batch script has an answer. But I need same in shell script. | Just launch your jar adding a & at the end
Example :
```
#!/bin/bash
java -jar myjar1.jar &
java -jar myjar2.jar &
java -jar myjar3.jar &
```
If you want the jar keep running after closing the terminal, use nohup :
```
#!/bin/bash
nohup java -jar myjar1.jar &
nohup java -jar myjar2.jar &
nohup java -jar myjar3.jar... |
24102663 | How do I use bash to bulk add a file full of IP blocks to IPTables | 8 | 2014-06-08 03:16:53 | <p>How can I bulk add a text file full of IP blocks to IPTables using BASH (or another scripting language)? Or is there some other way of blocking these address ranges?</p>
<p>EDIT: In other words is there a way to program something to iterate through the file and build the relevant entries? </p>
| 5,770 | 1,499,072 | 2016-01-07 21:25:51 | 24,102,703 | 15 | 2014-06-08 03:23:39 | 1,347,170 | 2014-06-08 03:23:39 | https://stackoverflow.com/q/24102663 | https://stackoverflow.com/a/24102703 | <p>Could you just create a loop within your iptables config script? Something like</p>
<pre><code>#!/bin/bash
for x in $(cat ip_list.txt)
do
iptables -A INPUT -s $x -j DROP
done
</code></pre>
<p>Where your <code>ip_list.txt</code> file would just look like</p>
<pre><code>1.1.1.1
2.2.2.2
3.3.3.3
etc
</code></pre>... | <p>Could you just create a loop within your iptables config script? Something like</p> <pre><code>#!/bin/bash for x in $(cat ip_list.txt) do iptables -A INPUT -s $x -j DROP done </code></pre> <p>Where your <code>ip_list.txt</code> file would just look like</p> <pre><code>1.1.1.1 2.2.2.2 3.3.3.3 etc </code></pre>... | 387, 5431 | bash, iptables | <h1>How do I use bash to bulk add a file full of IP blocks to IPTables</h1>
<p>How can I bulk add a text file full of IP blocks to IPTables using BASH (or another scripting language)? Or is there some other way of blocking these address ranges?</p>
<p>EDIT: In other words is there a way to program something to iterate... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,387 | bash | # How do I use bash to bulk add a file full of IP blocks to IPTables
How can I bulk add a text file full of IP blocks to IPTables using BASH (or another scripting language)? Or is there some other way of blocking these address ranges?
EDIT: In other words is there a way to program something to iterate through the fil... | Could you just create a loop within your iptables config script? Something like
```
#!/bin/bash
for x in $(cat ip_list.txt)
do
iptables -A INPUT -s $x -j DROP
done
```
Where your `ip_list.txt` file would just look like
```
1.1.1.1
2.2.2.2
3.3.3.3
etc
``` |
23441994 | truncate table via command line in Linux | 8 | 2014-05-03 08:27:54 | <p>I want to truncate one of my db table using mysqldump command so that I can place that command in sh file for executing it on daily basis. Do any one know about this command? Thanks in advance</p>
| 13,799 | 2,042,759 | 2019-08-20 15:38:37 | 23,442,043 | 15 | 2014-05-03 08:33:29 | 1,767,938 | 2014-05-03 08:33:29 | https://stackoverflow.com/q/23441994 | https://stackoverflow.com/a/23442043 | <p>You can use mysql command line client to do it</p>
<pre><code>mysql -h dbserver_hostname -e "truncate table schema_name.table_name"
</code></pre>
| <p>You can use mysql command line client to do it</p> <pre><code>mysql -h dbserver_hostname -e "truncate table schema_name.table_name" </code></pre> | 21, 58, 10327 | linux, mysql, sh | <h1>truncate table via command line in Linux</h1>
<p>I want to truncate one of my db table using mysqldump command so that I can place that command in sh file for executing it on daily basis. Do any one know about this command? Thanks in advance</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,388 | bash | # truncate table via command line in Linux
I want to truncate one of my db table using mysqldump command so that I can place that command in sh file for executing it on daily basis. Do any one know about this command? Thanks in advance | You can use mysql command line client to do it
```
mysql -h dbserver_hostname -e "truncate table schema_name.table_name"
``` |
22797530 | How to print #!/bin/bash using echo command | 8 | 2014-04-01 21:46:27 | <p>I have tried the escape character but it doesn't seems works with <strong>!</strong>.
I need this to auto-configure packages using scripts.</p>
| 21,239 | 2,828,681 | 2014-04-02 07:11:32 | 22,797,555 | 15 | 2014-04-01 21:48:18 | 1,899,640 | 2014-04-01 21:48:18 | https://stackoverflow.com/q/22797530 | https://stackoverflow.com/a/22797555 | <p><code>!</code> is magic in a default interactive bash session, but not in scripts (<code>set +H</code> to disable in an interactive prompt). In any case:</p>
<pre><code>echo '#!/bin/bash'
</code></pre>
| <p><code>!</code> is magic in a default interactive bash session, but not in scripts (<code>set +H</code> to disable in an interactive prompt). In any case:</p> <pre><code>echo '#!/bin/bash' </code></pre> | 387, 390, 1796, 4804, 13824 | bash, command, echo, escaping, shell | <h1>How to print #!/bin/bash using echo command</h1>
<p>I have tried the escape character but it doesn't seems works with <strong>!</strong>.
I need this to auto-configure packages using scripts.</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,389 | bash | # How to print #!/bin/bash using echo command
I have tried the escape character but it doesn't seems works with **!**.
I need this to auto-configure packages using scripts. | `!` is magic in a default interactive bash session, but not in scripts (`set +H` to disable in an interactive prompt). In any case:
```
echo '#!/bin/bash'
``` |
22574201 | Running python script as root | 8 | 2014-03-22 06:20:34 | <p>I have the following script:</p>
<pre><code>#!/usr/bin/env python
import sys
import pyttsx
def main(): ... | 105,526 | 1,190,419 | 2023-10-10 17:10:56 | 22,574,300 | 15 | 2014-03-22 06:32:01 | 641,955 | 2019-08-22 04:20:49 | https://stackoverflow.com/q/22574201 | https://stackoverflow.com/a/22574300 | <p>So you want the script to run as <code>root</code>, even without <code>sudo</code>? For that you would need to set the <em>setuid bit</em> on the script with <code>sudo chmod u+s program</code>. However, most Unix distributions allow this only for binaries, and not for scripts, for security reasons. In general it's ... | <p>So you want the script to run as <code>root</code>, even without <code>sudo</code>? For that you would need to set the <em>setuid bit</em> on the script with <code>sudo chmod u+s program</code>. However, most Unix distributions allow this only for binaries, and not for scripts, for security reasons. In general it's ... | 16, 390, 10824, 12079 | alsa, python, root, shell | <h1>Running python script as root</h1>
<p>I have the following script:</p>
<pre><code>#!/usr/bin/env python
import sys
import pyttsx ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,390 | bash | # Running python script as root
I have the following script:
```
#!/usr/bin/env python
import sys
import pyttsx
def main... | So you want the script to run as `root`, even without `sudo`? For that you would need to set the *setuid bit* on the script with `sudo chmod u+s program`. However, most Unix distributions allow this only for binaries, and not for scripts, for security reasons. In general it's really not a good idea to do that.
If you ... |
21342094 | How Can I calculate the sum of a specific column using bash? | 8 | 2014-01-24 20:40:31 | <p>I want to calculate the sum of a specific column using bash without using the print that specific column (I want to keep all the output columns of my pipeline and only sum one of them!)</p>
| 22,803 | 1,080,684 | 2016-06-14 11:29:13 | 21,342,227 | 15 | 2014-01-24 20:48:32 | 3,030,305 | 2014-01-24 20:48:32 | https://stackoverflow.com/q/21342094 | https://stackoverflow.com/a/21342227 | <p>If you wanted to sum over, say, the second column, but print all columns in some pipeline:</p>
<pre><code>cat data | awk '{sum+=$2 ; print $0} END{print "sum=",sum}'
</code></pre>
<p>If the file data looks like:</p>
<pre><code>1 2 3
4 5 6
7 8 9
</code></pre>
<p>Then the output would be:</p>
<pre><code>1 2 3
4 5... | <p>If you wanted to sum over, say, the second column, but print all columns in some pipeline:</p> <pre><code>cat data | awk '{sum+=$2 ; print $0} END{print "sum=",sum}' </code></pre> <p>If the file data looks like:</p> <pre><code>1 2 3 4 5 6 7 8 9 </code></pre> <p>Then the output would be:</p> <pre><code>1 2 3 4 5... | 387, 4928 | bash, sum | <h1>How Can I calculate the sum of a specific column using bash?</h1>
<p>I want to calculate the sum of a specific column using bash without using the print that specific column (I want to keep all the output columns of my pipeline and only sum one of them!)</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,391 | bash | # How Can I calculate the sum of a specific column using bash?
I want to calculate the sum of a specific column using bash without using the print that specific column (I want to keep all the output columns of my pipeline and only sum one of them!) | If you wanted to sum over, say, the second column, but print all columns in some pipeline:
```
cat data | awk '{sum+=$2 ; print $0} END{print "sum=",sum}'
```
If the file data looks like:
```
1 2 3
4 5 6
7 8 9
```
Then the output would be:
```
1 2 3
4 5 6
7 8 9
sum= 15
``` |
17747864 | how can I use linux command sed to process Little-endian UTF-16 file | 8 | 2013-07-19 13:53:05 | <p>I am working on an application about windows rdp. Now I get a problem when I try to use the sed command to replace the string of IP address directly in the rdp file. But after executing this command, the origin rdp file is garbled. </p>
<pre><code>sed -i "s/address:s:.*/address:s:$(cat check-free-ip.to.rdpzhitong.r... | 7,070 | 2,576,093 | 2013-07-22 11:18:03 | 17,786,213 | 15 | 2013-07-22 11:18:03 | 733,345 | 2013-07-22 11:18:03 | https://stackoverflow.com/q/17747864 | https://stackoverflow.com/a/17786213 | <p>If the file is UTF-16 encoded text (as <a href="http://msdn.microsoft.com/en-us/library/ms861803.aspx">RDP is</a>), and that is not your current encoding (it's not likely to be on Linux) then you can pre- and post-process the file with <code>iconv</code>. For example:</p>
<pre><code>iconv -f utf-16 -t us-ascii <... | <p>If the file is UTF-16 encoded text (as <a href="http://msdn.microsoft.com/en-us/library/ms861803.aspx">RDP is</a>), and that is not your current encoding (it's not likely to be on Linux) then you can pre- and post-process the file with <code>iconv</code>. For example:</p> <pre><code>iconv -f utf-16 -t us-ascii <... | 390, 10016, 11692 | endianness, shell, utf-16 | <h1>how can I use linux command sed to process Little-endian UTF-16 file</h1>
<p>I am working on an application about windows rdp. Now I get a problem when I try to use the sed command to replace the string of IP address directly in the rdp file. But after executing this command, the origin rdp file is garbled. </p>
<... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,392 | bash | # how can I use linux command sed to process Little-endian UTF-16 file
I am working on an application about windows rdp. Now I get a problem when I try to use the sed command to replace the string of IP address directly in the rdp file. But after executing this command, the origin rdp file is garbled.
```
sed -i "s/a... | If the file is UTF-16 encoded text (as [RDP is](http://msdn.microsoft.com/en-us/library/ms861803.aspx)), and that is not your current encoding (it's not likely to be on Linux) then you can pre- and post-process the file with `iconv`. For example:
```
iconv -f utf-16 -t us-ascii <rdpzhitong.rdp |
sed 's/original/modif... |
17628867 | solve $1: ambiguous redirect | 8 | 2013-07-13 09:34:52 | <p>I'm using this script to backup an old private instance of postgresql to gmail periodically:</p>
<pre><code>#!/bin/bash
/opt/local/lib/postgresql83/bin/pg_dump maxgests -U postgres | gzip --best -c > $1 && (/opt/local/bin/mutt -s `date "+%d-%m-%Y-%H:%M"` -a $1 $2 < /dev/null)
</code></pre>
<p>As of l... | 39,878 | 2,448,104 | 2013-07-13 09:40:42 | 17,628,906 | 15 | 2013-07-13 09:38:47 | 874,188 | 2013-07-13 09:38:47 | https://stackoverflow.com/q/17628867 | https://stackoverflow.com/a/17628906 | <p><code>$1</code> is apparently empty.</p>
<p>As a general guidance, you should put your variable interpolations in double quotes, nearly always.</p>
| <p><code>$1</code> is apparently empty.</p> <p>As a general guidance, you should put your variable interpolations in double quotes, nearly always.</p> | 387 | bash | <h1>solve $1: ambiguous redirect</h1>
<p>I'm using this script to backup an old private instance of postgresql to gmail periodically:</p>
<pre><code>#!/bin/bash
/opt/local/lib/postgresql83/bin/pg_dump maxgests -U postgres | gzip --best -c > $1 && (/opt/local/bin/mutt -s `date "+%d-%m-%Y-%H:%M"` -a $1 $2 <... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,393 | bash | # solve $1: ambiguous redirect
I'm using this script to backup an old private instance of postgresql to gmail periodically:
```
#!/bin/bash
/opt/local/lib/postgresql83/bin/pg_dump maxgests -U postgres | gzip --best -c > $1 && (/opt/local/bin/mutt -s `date "+%d-%m-%Y-%H:%M"` -a $1 $2 < /dev/null)
```
As of late I'm g... | `$1` is apparently empty.
As a general guidance, you should put your variable interpolations in double quotes, nearly always. |
16597342 | bash test for yum or apt based linux | 8 | 2013-05-16 20:57:41 | <p>Simple question -- what's the canonical way to test in bash whether yum or apt-get are present? I'm writing a script that will run on client machines and install unison, then create a cron job for it ... </p>
| 6,899 | 362,808 | 2014-07-27 15:35:20 | 16,597,499 | 15 | 2013-05-16 21:07:18 | 2,327,476 | 2013-05-16 21:16:58 | https://stackoverflow.com/q/16597342 | https://stackoverflow.com/a/16597499 | <p>With bash script (or sh, zsh, ksh) you could use the builtin <code>command -v yum</code> and <code>command -v apt-get</code>.<br>
(yes, the command is named command)</p>
<p>Zero output means it isn't there, otherwise you get the commands path.</p>
<p>You could then use a test statement to test whether the result w... | <p>With bash script (or sh, zsh, ksh) you could use the builtin <code>command -v yum</code> and <code>command -v apt-get</code>.<br> (yes, the command is named command)</p> <p>Zero output means it isn't there, otherwise you get the commands path.</p> <p>You could then use a test statement to test whether the result w... | 387, 7425, 16113 | apt-get, bash, yum | <h1>bash test for yum or apt based linux</h1>
<p>Simple question -- what's the canonical way to test in bash whether yum or apt-get are present? I'm writing a script that will run on client machines and install unison, then create a cron job for it ... </p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,394 | bash | # bash test for yum or apt based linux
Simple question -- what's the canonical way to test in bash whether yum or apt-get are present? I'm writing a script that will run on client machines and install unison, then create a cron job for it ... | With bash script (or sh, zsh, ksh) you could use the builtin `command -v yum` and `command -v apt-get`.
(yes, the command is named command)
Zero output means it isn't there, otherwise you get the commands path.
You could then use a test statement to test whether the result was null or not.
```
[ -n "$(command -v y... |
16322792 | 'tail -f' doesn't give single lines when piped through grep' | 8 | 2013-05-01 17:03:13 | <p>I am launching a website, and I wanted to setup a Bash one-liner so when someone hits the site it would make a beep using the internal buzzer.</p>
<p>So far it's working using the following.</p>
<pre><code>tail -f access_log | while read x ; do echo -ne '\007' $x '\n' ; done
</code></pre>
<p>Tail follows the acce... | 1,657 | 683,017 | 2022-10-24 15:52:50 | 16,322,840 | 15 | 2013-05-01 17:05:56 | 68,587 | 2013-05-01 17:05:56 | https://stackoverflow.com/q/16322792 | https://stackoverflow.com/a/16322840 | <p>Grep's output is buffered when it's used in a pipe. Use <code>--line-buffered</code> to force it to use line buffering so it outputs lines immediately.</p>
<pre><code>tail -f access_log | grep --line-buffered "/index.php" | while read x ; do echo -ne '\007' $x '\n' ; done
</code></pre>
<p>You could also combine th... | <p>Grep's output is buffered when it's used in a pipe. Use <code>--line-buffered</code> to force it to use line buffering so it outputs lines immediately.</p> <pre><code>tail -f access_log | grep --line-buffered "/index.php" | while read x ; do echo -ne '\007' $x '\n' ; done </code></pre> <p>You could also combine th... | 387 | bash | <h1>'tail -f' doesn't give single lines when piped through grep'</h1>
<p>I am launching a website, and I wanted to setup a Bash one-liner so when someone hits the site it would make a beep using the internal buzzer.</p>
<p>So far it's working using the following.</p>
<pre><code>tail -f access_log | while read x ; do ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,395 | bash | # 'tail -f' doesn't give single lines when piped through grep'
I am launching a website, and I wanted to setup a Bash one-liner so when someone hits the site it would make a beep using the internal buzzer.
So far it's working using the following.
```
tail -f access_log | while read x ; do echo -ne '\007' $x '\n' ; d... | Grep's output is buffered when it's used in a pipe. Use `--line-buffered` to force it to use line buffering so it outputs lines immediately.
```
tail -f access_log | grep --line-buffered "/index.php" | while read x ; do echo -ne '\007' $x '\n' ; done
```
You could also combine the `grep` and `while` loop into a singl... |
14629121 | Bash split string | 8 | 2013-01-31 15:19:56 | <p>I have the following data in array:</p>
<pre><code>MY_ARR[0]="./path/path2/name.exe 'word1 word2' 'name1,name2'"
MY_ARR[1]="./path/path2/name.exe 'word1 word2' 'name3,name4,name5'"
MY_ARR[2]=".name.exe 'word1 word2'"
MY_ARR[3]="name.exe"
MY_ARR[4]="./path/path2/name.exe 'word1 word2' 'name1'"
MY_ARR[5]="./path/pat... | 21,901 | 1,109,014 | 2014-01-31 11:21:46 | 14,629,210 | 15 | 2013-01-31 15:25:05 | 1,983,854 | 2014-01-08 10:17:29 | https://stackoverflow.com/q/14629121 | https://stackoverflow.com/a/14629210 | <p>It looks like the separator between the fields is an space. Hence, you can use <code>cut</code> to split them:</p>
<pre><code>file=$(echo "${MY_ARR[1]}" | cut -d' ' -f1)
parameter=$(echo "${MY_ARR[1]}" | cut -d' ' -f2-)
</code></pre>
<ul>
<li><code>-f1</code> means the first parameter.</li>
<li><code>-f2-</code> m... | <p>It looks like the separator between the fields is an space. Hence, you can use <code>cut</code> to split them:</p> <pre><code>file=$(echo "${MY_ARR[1]}" | cut -d' ' -f1) parameter=$(echo "${MY_ARR[1]}" | cut -d' ' -f2-) </code></pre> <ul> <li><code>-f1</code> means the first parameter.</li> <li><code>-f2-</code> m... | 139, 387, 990, 2193, 4257 | awk, bash, cut, split, string | <h1>Bash split string</h1>
<p>I have the following data in array:</p>
<pre><code>MY_ARR[0]="./path/path2/name.exe 'word1 word2' 'name1,name2'"
MY_ARR[1]="./path/path2/name.exe 'word1 word2' 'name3,name4,name5'"
MY_ARR[2]=".name.exe 'word1 word2'"
MY_ARR[3]="name.exe"
MY_ARR[4]="./path/path2/name.exe 'word1 word2' 'na... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,397 | bash | # Bash split string
I have the following data in array:
```
MY_ARR[0]="./path/path2/name.exe 'word1 word2' 'name1,name2'"
MY_ARR[1]="./path/path2/name.exe 'word1 word2' 'name3,name4,name5'"
MY_ARR[2]=".name.exe 'word1 word2'"
MY_ARR[3]="name.exe"
MY_ARR[4]="./path/path2/name.exe 'word1 word2' 'name1'"
MY_ARR[5]="./p... | It looks like the separator between the fields is an space. Hence, you can use `cut` to split them:
```
file=$(echo "${MY_ARR[1]}" | cut -d' ' -f1)
parameter=$(echo "${MY_ARR[1]}" | cut -d' ' -f2-)
```
- `-f1` means the first parameter.
- `-f2-` means everything from the second parameter. |
14544636 | Respect last line if it's not terminated with a new line char (\n) when using read | 8 | 2013-01-27 05:11:28 | <p>I have noticed for a while that <code>read</code> never actually reads the last line of a file if there is not, at the end of it, a "newline" character. This is understandable if one consider that, as long as there is not a "newline" character in a file, it is as if it contained 0 line (which is quite difficult to a... | 10,480 | 2,002,452 | 2013-03-23 01:07:25 | 14,547,230 | 15 | 2013-01-27 12:19:35 | 990,363 | 2013-03-23 01:07:25 | https://stackoverflow.com/q/14544636 | https://stackoverflow.com/a/14547230 | <p><code>read</code> does, in fact, read an unterminated line into the assigned var (<code>$REPLY</code> by default). It also returns false on such a line, which just means ‘end of file’; directly using its return value in the classic <code>while</code> loop thus skips that one last line. If you change the loop logic s... | <p><code>read</code> does, in fact, read an unterminated line into the assigned var (<code>$REPLY</code> by default). It also returns false on such a line, which just means ‘end of file’; directly using its return value in the classic <code>while</code> loop thus skips that one last line. If you change the loop logic s... | 387, 390, 14334 | bash, built-in, shell | <h1>Respect last line if it's not terminated with a new line char (\n) when using read</h1>
<p>I have noticed for a while that <code>read</code> never actually reads the last line of a file if there is not, at the end of it, a "newline" character. This is understandable if one consider that, as long as there is not a "... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,398 | bash | # Respect last line if it's not terminated with a new line char (\n) when using read
I have noticed for a while that `read` never actually reads the last line of a file if there is not, at the end of it, a "newline" character. This is understandable if one consider that, as long as there is not a "newline" character i... | `read` does, in fact, read an unterminated line into the assigned var (`$REPLY` by default). It also returns false on such a line, which just means ‘end of file’; directly using its return value in the classic `while` loop thus skips that one last line. If you change the loop logic slightly, you can process non-new lin... |
12286187 | Explain this command: . ~/nvm/nvm.sh | 8 | 2012-09-05 16:49:15 | <p>I am by no means a novice user on Linux, but I just don't understand why one has to put . in front of this command:</p>
<pre><code>. ~/nvm/nvm.sh
</code></pre>
<p>For those in the know, this is how to activate the nvm bash script (it allows for a virtual environment in the NodeJS universe). But if one does not put... | 8,887 | 1,143,837 | 2012-12-15 06:44:32 | 12,286,198 | 15 | 2012-09-05 16:50:16 | 714,501 | 2012-12-15 06:44:32 | https://stackoverflow.com/q/12286187 | https://stackoverflow.com/a/12286198 | <blockquote>
<pre><code>. ~/nvm/nvm.sh
</code></pre>
</blockquote>
<p>It asks the interpreter to interpret the script <strong>in the current process</strong>. In <code>bash</code> it's equivalent to:</p>
<pre><code>source ~/nvm/nvm.sh
</code></pre>
<p>You need to execute a script in the current process if you want i... | <blockquote> <pre><code>. ~/nvm/nvm.sh </code></pre> </blockquote> <p>It asks the interpreter to interpret the script <strong>in the current process</strong>. In <code>bash</code> it's equivalent to:</p> <pre><code>source ~/nvm/nvm.sh </code></pre> <p>You need to execute a script in the current process if you want i... | 58, 387, 81748 | bash, linux, nvm | <h1>Explain this command: . ~/nvm/nvm.sh</h1>
<p>I am by no means a novice user on Linux, but I just don't understand why one has to put . in front of this command:</p>
<pre><code>. ~/nvm/nvm.sh
</code></pre>
<p>For those in the know, this is how to activate the nvm bash script (it allows for a virtual environment in... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,399 | bash | # Explain this command: . ~/nvm/nvm.sh
I am by no means a novice user on Linux, but I just don't understand why one has to put . in front of this command:
```
. ~/nvm/nvm.sh
```
For those in the know, this is how to activate the nvm bash script (it allows for a virtual environment in the NodeJS universe). But if one... | > ```
> . ~/nvm/nvm.sh
> ```
It asks the interpreter to interpret the script **in the current process**. In `bash` it's equivalent to:
```
source ~/nvm/nvm.sh
```
You need to execute a script in the current process if you want it to change the environment (variables, et al). You can view more details with `help .`
... |
12058705 | A better way to do git clone | 8 | 2012-08-21 15:54:50 | <p>This is lazy programmer request. I would like to create a shell script automate the following process: </p>
<pre><code>git clone <remote-repo-url>
cd <cloned-folder>
open <cloned-folder>
</code></pre>
<p>So the idea here is to clone a URL and then immediately <code>cd</code> into the <code>clone... | 13,871 | 782,901 | 2020-11-03 11:20:00 | 12,059,200 | 15 | 2012-08-21 16:25:08 | 745 | 2012-08-21 16:25:08 | https://stackoverflow.com/q/12058705 | https://stackoverflow.com/a/12059200 | <p>bash function to do this (works in zsh also):</p>
<pre><code>function lazyclone {
url=$1;
reponame=$(echo $url | awk -F/ '{print $NF}' | sed -e 's/.git$//');
git clone $url $reponame;
cd $reponame;
}
</code></pre>
<p>The <code>awk</code> command prints the part after the last <code>/</code> (e.g fr... | <p>bash function to do this (works in zsh also):</p> <pre><code>function lazyclone { url=$1; reponame=$(echo $url | awk -F/ '{print $NF}' | sed -e 's/.git$//'); git clone $url $reponame; cd $reponame; } </code></pre> <p>The <code>awk</code> command prints the part after the last <code>/</code> (e.g fr... | 119, 390, 1362 | automation, git, shell | <h1>A better way to do git clone</h1>
<p>This is lazy programmer request. I would like to create a shell script automate the following process: </p>
<pre><code>git clone <remote-repo-url>
cd <cloned-folder>
open <cloned-folder>
</code></pre>
<p>So the idea here is to clone a URL and then immediatel... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,400 | bash | # A better way to do git clone
This is lazy programmer request. I would like to create a shell script automate the following process:
```
git clone <remote-repo-url>
cd <cloned-folder>
open <cloned-folder>
```
So the idea here is to clone a URL and then immediately `cd` into the `cloned-folder`. The trick here is to... | bash function to do this (works in zsh also):
```
function lazyclone {
url=$1;
reponame=$(echo $url | awk -F/ '{print $NF}' | sed -e 's/.git$//');
git clone $url $reponame;
cd $reponame;
}
```
The `awk` command prints the part after the last `/` (e.g from `http://example.com/myrepo.git` to `myrepo.git... |
11660962 | Determine where a UNIX alias is defined | 8 | 2012-07-26 01:07:32 | <p>Is there a (somewhat) reliable way to get the 'origin' of a command, even if the command is an alias? For example, if I put this in my .bash_profile</p>
<pre><code>alias lsa="ls -A"
</code></pre>
<p>and I wanted to know from the command-line where <code>lsa</code> is defined, is that possible? I know about the <co... | 4,810 | 1,516,425 | 2016-09-06 07:09:06 | 11,660,985 | 15 | 2012-07-26 01:12:01 | 418,413 | 2013-08-30 21:40:37 | https://stackoverflow.com/q/11660962 | https://stackoverflow.com/a/11660985 | <p>As Carl pointed out in his comment, <code>type</code> is the correct way to find out how a name is defined.</p>
<pre class="lang-bash prettyprint-override"><code>mini:~ michael$ alias foo='echo bar'
mini:~ michael$ biz() { echo bar; }
mini:~ michael$ type foo
foo is aliased to `echo bar'
mini:~ michael$ type biz
bi... | <p>As Carl pointed out in his comment, <code>type</code> is the correct way to find out how a name is defined.</p> <pre class="lang-bash prettyprint-override"><code>mini:~ michael$ alias foo='echo bar' mini:~ michael$ biz() { echo bar; } mini:~ michael$ type foo foo is aliased to `echo bar' mini:~ michael$ type biz bi... | 34, 58, 387, 390 | bash, linux, shell, unix | <h1>Determine where a UNIX alias is defined</h1>
<p>Is there a (somewhat) reliable way to get the 'origin' of a command, even if the command is an alias? For example, if I put this in my .bash_profile</p>
<pre><code>alias lsa="ls -A"
</code></pre>
<p>and I wanted to know from the command-line where <code>lsa</code> i... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,401 | bash | # Determine where a UNIX alias is defined
Is there a (somewhat) reliable way to get the 'origin' of a command, even if the command is an alias? For example, if I put this in my .bash_profile
```
alias lsa="ls -A"
```
and I wanted to know from the command-line where `lsa` is defined, is that possible? I know about th... | As Carl pointed out in his comment, `type` is the correct way to find out how a name is defined.
```
mini:~ michael$ alias foo='echo bar'
mini:~ michael$ biz() { echo bar; }
mini:~ michael$ type foo
foo is aliased to `echo bar'
mini:~ michael$ type biz
biz is a function
biz ()
{
echo bar
}
mini:~ michael$ type [... |
10575005 | Output a boolean from an Rscript into a Bash variable | 8 | 2012-05-13 20:34:10 | <p>I have an R script that outputs TRUE or FALSE. In R, it's using a bona fide T/F data type, but when I echo its return value to bash, it seems to be a string, saying:</p>
<p><code>"[1] TRUE"</code></p>
<p>or</p>
<p><code>"[1] FALSE"</code></p>
<p>They are both preceded by [1]. Neither is [0], th... | 6,106 | 1,052,117 | 2022-01-10 17:35:07 | 10,575,091 | 15 | 2012-05-13 20:46:14 | 1,855,677 | 2012-05-16 19:45:15 | https://stackoverflow.com/q/10575005 | https://stackoverflow.com/a/10575091 | <p>Instead of using either print() or the implicit print()-ing that occurs when an object name is offered to the R interpreter, you should be using <code>cat()</code> which will not prepend the "[1] " in front of either TRUE or FALSE. If you want 0/1, then use <code>cat(as.numeric(.))</code>. Try this instead:</p>
<pr... | <p>Instead of using either print() or the implicit print()-ing that occurs when an object name is offered to the R interpreter, you should be using <code>cat()</code> which will not prepend the "[1] " in front of either TRUE or FALSE. If you want 0/1, then use <code>cat(as.numeric(.))</code>. Try this instead:</p> <pr... | 387, 4452 | bash, r | <h1>Output a boolean from an Rscript into a Bash variable</h1>
<p>I have an R script that outputs TRUE or FALSE. In R, it's using a bona fide T/F data type, but when I echo its return value to bash, it seems to be a string, saying:</p>
<p><code>"[1] TRUE"</code></p>
<p>or</p>
<p><code>"[1] FALSE"</... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,402 | bash | # Output a boolean from an Rscript into a Bash variable
I have an R script that outputs TRUE or FALSE. In R, it's using a bona fide T/F data type, but when I echo its return value to bash, it seems to be a string, saying:
`"[1] TRUE"`
or
`"[1] FALSE"`
They are both preceded by [1]. Neither is [0], that is not a ty... | Instead of using either print() or the implicit print()-ing that occurs when an object name is offered to the R interpreter, you should be using `cat()` which will not prepend the "[1] " in front of either TRUE or FALSE. If you want 0/1, then use `cat(as.numeric(.))`. Try this instead:
```
myinput <- TRUE #or FALSE
Fu... |
10234872 | Changing system proxy settings in Ubuntu 12.04 from terminal | 8 | 2012-04-19 18:54:52 | <p>I've been working in Ubuntu 12.04 and one of the things that I am trying to implement in a Bash script is modifying the proxy settings of the system. To clarify, this would be a script that sets up each VM that I make with the programs and packages that I need. I can find and edit the Proxy settings manually through... | 31,189 | 1,188,403 | 2013-05-03 06:13:47 | 10,313,887 | 15 | 2012-04-25 10:32:45 | 39,726 | 2012-04-25 10:32:45 | https://stackoverflow.com/q/10234872 | https://stackoverflow.com/a/10313887 | <p>You must use new <code>gsettings</code> tool and not old gconftool, with a bit different keys:</p>
<pre><code>gsettings set org.gnome.system.proxy.socks host '127.0.0.1'
gsettings set org.gnome.system.proxy.socks port 3128
gsettings set org.gnome.system.proxy mode 'manual'
# to disable proxy:
# gsettings set org.g... | <p>You must use new <code>gsettings</code> tool and not old gconftool, with a bit different keys:</p> <pre><code>gsettings set org.gnome.system.proxy.socks host '127.0.0.1' gsettings set org.gnome.system.proxy.socks port 3128 gsettings set org.gnome.system.proxy mode 'manual' # to disable proxy: # gsettings set org.g... | 58, 387, 549, 725, 760 | bash, configuration, linux, proxy, ubuntu | <h1>Changing system proxy settings in Ubuntu 12.04 from terminal</h1>
<p>I've been working in Ubuntu 12.04 and one of the things that I am trying to implement in a Bash script is modifying the proxy settings of the system. To clarify, this would be a script that sets up each VM that I make with the programs and package... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,404 | bash | # Changing system proxy settings in Ubuntu 12.04 from terminal
I've been working in Ubuntu 12.04 and one of the things that I am trying to implement in a Bash script is modifying the proxy settings of the system. To clarify, this would be a script that sets up each VM that I make with the programs and packages that I ... | You must use new `gsettings` tool and not old gconftool, with a bit different keys:
```
gsettings set org.gnome.system.proxy.socks host '127.0.0.1'
gsettings set org.gnome.system.proxy.socks port 3128
gsettings set org.gnome.system.proxy mode 'manual'
# to disable proxy:
# gsettings set org.gnome.system.proxy mode 'n... |
10076741 | How to redirect standard input and output with Bash | 8 | 2012-04-09 16:57:44 | <pre><code>#!/bin/bash
./program < input.txt > output.txt
</code></pre>
<p>The <code>> output.txt</code> part is being ignored so output.txt ends up being empty.</p>
<p>This works for the <code>sort</code> command so I expected to also work for other programs.</p>
<p>Any reason this doesn't work? How should... | 8,663 | 658,014 | 2012-04-09 17:01:32 | 10,076,805 | 15 | 2012-04-09 17:01:32 | 129,570 | 2012-04-09 17:01:32 | https://stackoverflow.com/q/10076741 | https://stackoverflow.com/a/10076805 | <p>The most likely explanation is that the output you're seeing is from <code>stderr</code>, not <code>stdout</code>. To redirect both of them to a file, do this:</p>
<pre><code>./program < input.txt > output.txt 2>&1
</code></pre>
<p>or</p>
<pre><code>./program < input.txt &> output.txt
</co... | <p>The most likely explanation is that the output you're seeing is from <code>stderr</code>, not <code>stdout</code>. To redirect both of them to a file, do this:</p> <pre><code>./program < input.txt > output.txt 2>&1 </code></pre> <p>or</p> <pre><code>./program < input.txt &> output.txt </co... | 345, 387 | bash, io | <h1>How to redirect standard input and output with Bash</h1>
<pre><code>#!/bin/bash
./program < input.txt > output.txt
</code></pre>
<p>The <code>> output.txt</code> part is being ignored so output.txt ends up being empty.</p>
<p>This works for the <code>sort</code> command so I expected to also work for oth... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,405 | bash | # How to redirect standard input and output with Bash
```
#!/bin/bash
./program < input.txt > output.txt
```
The `> output.txt` part is being ignored so output.txt ends up being empty.
This works for the `sort` command so I expected to also work for other programs.
Any reason this doesn't work? How should I achieve... | The most likely explanation is that the output you're seeing is from `stderr`, not `stdout`. To redirect both of them to a file, do this:
```
./program < input.txt > output.txt 2>&1
```
or
```
./program < input.txt &> output.txt
``` |
9606503 | Using sed and regex to capture last part of url | 8 | 2012-03-07 17:42:34 | <p>I'm trying to make sed match the last part of a url and output just that. For example:</p>
<p><code>echo "http://randomurl/suburl/file.mp3" | sed (expression)</code></p>
<p>should give the output:</p>
<p><code>file.mp3</code></p>
<p>So far I've tried <code>sed 's|\([^/]+mp3\)$|\1|g'</code> but it just outputs th... | 7,080 | 909,438 | 2012-10-22 07:12:19 | 9,606,533 | 15 | 2012-03-07 17:44:22 | 164,835 | 2012-03-07 17:44:22 | https://stackoverflow.com/q/9606503 | https://stackoverflow.com/a/9606533 | <p>this works:</p>
<pre><code> echo "http://randomurl/suburl/file.mp3" | sed 's#.*/##'
</code></pre>
| <p>this works:</p> <pre><code> echo "http://randomurl/suburl/file.mp3" | sed 's#.*/##' </code></pre> | 18, 58, 387 | bash, linux, regex | <h1>Using sed and regex to capture last part of url</h1>
<p>I'm trying to make sed match the last part of a url and output just that. For example:</p>
<p><code>echo "http://randomurl/suburl/file.mp3" | sed (expression)</code></p>
<p>should give the output:</p>
<p><code>file.mp3</code></p>
<p>So far I've tried <code... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,406 | bash | # Using sed and regex to capture last part of url
I'm trying to make sed match the last part of a url and output just that. For example:
`echo "http://randomurl/suburl/file.mp3" | sed (expression)`
should give the output:
`file.mp3`
So far I've tried `sed 's|\([^/]+mp3\)$|\1|g'` but it just outputs the whole url. ... | this works:
```
echo "http://randomurl/suburl/file.mp3" | sed 's#.*/##'
``` |
7176572 | How to merge files in bash in alphabetical order | 8 | 2011-08-24 13:52:12 | <p>I need to merge a bunch of mp3 files together. I know that simply doing </p>
<pre><code>cat file1.mp3 >> file2.mp3
</code></pre>
<p>seems to work fine (at least it plays back correctly on my Zune anyway).</p>
<p>I'd like to run </p>
<pre><code>cat *.mp3 > merged.mp3
</code></pre>
<p>but since there are... | 10,998 | 117,549 | 2011-08-24 15:12:42 | 7,176,969 | 15 | 2011-08-24 14:17:09 | 115,845 | 2011-08-24 15:12:42 | https://stackoverflow.com/q/7176572 | https://stackoverflow.com/a/7176969 | <p>Your version (<code>cat *.mp3 > merged.mp3</code>) should work as you'd expect. The <code>*.mp3</code> is expanded by the shell and will be in alphabetical order. </p>
<p>From the <a href="http://www.gnu.org/software/bash/manual/bashref.html#index-pathname-expansion-95" rel="nofollow noreferrer">Bash Reference M... | <p>Your version (<code>cat *.mp3 > merged.mp3</code>) should work as you'd expect. The <code>*.mp3</code> is expanded by the shell and will be in alphabetical order. </p> <p>From the <a href="http://www.gnu.org/software/bash/manual/bashref.html#index-pathname-expansion-95" rel="nofollow noreferrer">Bash Reference M... | 387, 3589, 22820 | bash, cat, ls | <h1>How to merge files in bash in alphabetical order</h1>
<p>I need to merge a bunch of mp3 files together. I know that simply doing </p>
<pre><code>cat file1.mp3 >> file2.mp3
</code></pre>
<p>seems to work fine (at least it plays back correctly on my Zune anyway).</p>
<p>I'd like to run </p>
<pre><code>cat *... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,407 | bash | # How to merge files in bash in alphabetical order
I need to merge a bunch of mp3 files together. I know that simply doing
```
cat file1.mp3 >> file2.mp3
```
seems to work fine (at least it plays back correctly on my Zune anyway).
I'd like to run
```
cat *.mp3 > merged.mp3
```
but since there are around 50 separa... | Your version (`cat *.mp3 > merged.mp3`) should work as you'd expect. The `*.mp3` is expanded by the shell and will be in alphabetical order.
From the [Bash Reference Manual](http://www.gnu.org/software/bash/manual/bashref.html#index-pathname-expansion-95):
> After word splitting, unless the -f option has been set, Ba... |
3819659 | How to do "tail this file until that process stops" in Bash? | 8 | 2010-09-29 07:44:02 | <p>I have a couple of scripts to control some applications (start/stop/list/etc). Currently my "stop" script just sends an interrupt signal to an application, but I'd like to have more feedback about what application does when it is shutting down. Ideally, I'd like to start tailing its log, then send an interrupt signa... | 3,212 | 6,533 | 2020-02-09 08:53:53 | 3,819,814 | 15 | 2010-09-29 08:15:57 | 182,675 | 2010-09-29 15:34:26 | https://stackoverflow.com/q/3819659 | https://stackoverflow.com/a/3819814 | <p>For just tailing a log file until a certain process stops (using <code>tail</code> from <em>GNU coreutils</em>):</p>
<pre><code>do_something > logfile &
tail --pid $! -f logfile
</code></pre>
<p><strong>UPDATE</strong> The above contains a race condition: In case <code>do_something</code> spews many lines i... | <p>For just tailing a log file until a certain process stops (using <code>tail</code> from <em>GNU coreutils</em>):</p> <pre><code>do_something > logfile & tail --pid $! -f logfile </code></pre> <p><strong>UPDATE</strong> The above contains a race condition: In case <code>do_something</code> spews many lines i... | 387, 390 | bash, shell | <h1>How to do "tail this file until that process stops" in Bash?</h1>
<p>I have a couple of scripts to control some applications (start/stop/list/etc). Currently my "stop" script just sends an interrupt signal to an application, but I'd like to have more feedback about what application does when it is shutting down. Id... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,408 | bash | # How to do "tail this file until that process stops" in Bash?
I have a couple of scripts to control some applications (start/stop/list/etc). Currently my "stop" script just sends an interrupt signal to an application, but I'd like to have more feedback about what application does when it is shutting down. Ideally, I'... | For just tailing a log file until a certain process stops (using `tail` from *GNU coreutils*):
```
do_something > logfile &
tail --pid $! -f logfile
```
**UPDATE** The above contains a race condition: In case `do_something` spews many lines into `logfile`, the `tail` will skip all of them but the last few. To avoid t... |
374687 | Why is "echo foo | read a ; echo $a" not working as expected? | 8 | 2008-12-17 14:27:33 | <p>I could replicate the problem with various shells under FreeBSD, GNU/Linux, and Solaris. It had me head-scratching for more than an hour, so I decided to post the question here.</p>
| 9,932 | 20,520 | 2014-07-13 00:13:13 | 374,702 | 15 | 2008-12-17 14:31:10 | 43,582 | 2008-12-17 14:31:10 | https://stackoverflow.com/q/374687 | https://stackoverflow.com/a/374702 | <p>Due to the piping the <code>read</code> is executed in its own subshell.</p>
<pre><code>echo foo | while read a; do echo $a; done
</code></pre>
<p>will do what you expect it to.</p>
| <p>Due to the piping the <code>read</code> is executed in its own subshell.</p> <pre><code>echo foo | while read a; do echo $a; done </code></pre> <p>will do what you expect it to.</p> | 34, 58, 390 | linux, shell, unix | <h1>Why is "echo foo | read a ; echo $a" not working as expected?</h1>
<p>I could replicate the problem with various shells under FreeBSD, GNU/Linux, and Solaris. It had me head-scratching for more than an hour, so I decided to post the question here.</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,409 | bash | # Why is "echo foo | read a ; echo $a" not working as expected?
I could replicate the problem with various shells under FreeBSD, GNU/Linux, and Solaris. It had me head-scratching for more than an hour, so I decided to post the question here. | Due to the piping the `read` is executed in its own subshell.
```
echo foo | while read a; do echo $a; done
```
will do what you expect it to. |
71324859 | bash: npm: command not found in cPanel Terminal | 7 | 2022-03-02 15:01:03 | <p>I get response, When try to write:</p>
<pre><code>$ /opt/cpanel/ea-nodejs16/bin/npm -v
8.1.2
</code></pre>
<p>but with :</p>
<pre><code>$ npm -v
bash: npm: command not found
</code></pre>
<p>So, I tried as the same logic but it didn't work:</p>
<pre><code>$ /opt/cpanel/ea-nodejs16/bin/npm install
npm ERR! code ENOEN... | 16,608 | 11,973,741 | 2022-09-08 09:02:40 | 73,646,358 | 15 | 2022-09-08 09:02:40 | 11,992,703 | 2022-09-08 09:02:40 | https://stackoverflow.com/q/71324859 | https://stackoverflow.com/a/73646358 | <p>First install NodeJS install on cPanel, WHM.</p>
<p>To install NodeJS from WHM, Goto <strong>Home /
Software /
EasyApache 4</strong></p>
<p>And in Additional Packages find NodeJS.</p>
<p><a href="https://i.sstatic.net/ip5GO.png" rel="noreferrer"><img src="https://i.sstatic.net/ip5GO.png" alt="enter image description... | <p>First install NodeJS install on cPanel, WHM.</p> <p>To install NodeJS from WHM, Goto <strong>Home / Software / EasyApache 4</strong></p> <p>And in Additional Packages find NodeJS.</p> <p><a href="https://i.sstatic.net/ip5GO.png" rel="noreferrer"><img src="https://i.sstatic.net/ip5GO.png" alt="enter image description... | 387, 12409, 12410, 46426, 61387 | bash, cpanel, node.js, npm, whm | <h1>bash: npm: command not found in cPanel Terminal</h1>
<p>I get response, When try to write:</p>
<pre><code>$ /opt/cpanel/ea-nodejs16/bin/npm -v
8.1.2
</code></pre>
<p>but with :</p>
<pre><code>$ npm -v
bash: npm: command not found
</code></pre>
<p>So, I tried as the same logic but it didn't work:</p>
<pre><code>$ /o... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,410 | bash | # bash: npm: command not found in cPanel Terminal
I get response, When try to write:
```
$ /opt/cpanel/ea-nodejs16/bin/npm -v
8.1.2
```
but with :
```
$ npm -v
bash: npm: command not found
```
So, I tried as the same logic but it didn't work:
```
$ /opt/cpanel/ea-nodejs16/bin/npm install
npm ERR! code ENOENT
npm ... | First install NodeJS install on cPanel, WHM.
To install NodeJS from WHM, Goto **Home /
Software /
EasyApache 4**
And in Additional Packages find NodeJS.
[](https://i.sstatic.net/ip5GO.png)
After that create an environment variable which points to the n... |
73603594 | I am Unable to start OpenSSH with Windows PowerShell | 7 | 2022-09-05 00:17:09 | <p><strong>Problem:</strong> Unable to issue command <code>Start-Service sshd</code> in Windows PowerShell 7.2.6.</p>
<p><strong>Expected Results:</strong> OpenSSH Server Starts.</p>
<p><strong>Actual Results:</strong> <code>Start-Service: Cannot find any service with service name 'sshd'.</code>.</p>
<p><strong>Investi... | 19,219 | 18,257,801 | 2025-07-19 05:02:10 | 73,603,692 | 15 | 2022-09-05 00:49:37 | 18,257,801 | 2022-09-05 00:49:37 | https://stackoverflow.com/q/73603594 | https://stackoverflow.com/a/73603692 | <p>As per Abraham Zinalas Comment.</p>
<p><strong>Solution</strong></p>
<pre><code>PS > Get-WindowsCapability -Online -Name open* | Add-WindowsCapability -Online
Path :
Online : True
RestartNeeded : False
Path :
Online : True
RestartNeeded : False
PS > Get-WindowsCapability -On... | <p>As per Abraham Zinalas Comment.</p> <p><strong>Solution</strong></p> <pre><code>PS > Get-WindowsCapability -Online -Name open* | Add-WindowsCapability -Online Path : Online : True RestartNeeded : False Path : Online : True RestartNeeded : False PS > Get-WindowsCapability -On... | 64, 386, 526 | powershell, ssh, windows | <h1>I am Unable to start OpenSSH with Windows PowerShell</h1>
<p><strong>Problem:</strong> Unable to issue command <code>Start-Service sshd</code> in Windows PowerShell 7.2.6.</p>
<p><strong>Expected Results:</strong> OpenSSH Server Starts.</p>
<p><strong>Actual Results:</strong> <code>Start-Service: Cannot find any se... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,411 | bash | # I am Unable to start OpenSSH with Windows PowerShell
**Problem:** Unable to issue command `Start-Service sshd` in Windows PowerShell 7.2.6.
**Expected Results:** OpenSSH Server Starts.
**Actual Results:** `Start-Service: Cannot find any service with service name 'sshd'.`.
**Investigation:** Above error clearing i... | As per Abraham Zinalas Comment.
**Solution**
```
PS > Get-WindowsCapability -Online -Name open* | Add-WindowsCapability -Online
Path :
Online : True
RestartNeeded : False
Path :
Online : True
RestartNeeded : False
PS > Get-WindowsCapability -Online -Name open*
Name : OpenS... |
59744790 | Bash/WSL - How to run command as root? | 7 | 2020-01-15 03:32:23 | <pre><code>>ubuntu1804.exe -c "echo $USER"
mpen
</code></pre>
<p>That runs the command as me, how do I run it as root?</p>
<p>The help page doesn't even mention <code>-c</code> </p>
<pre><code>>ubuntu1804.exe help
Launches or configures a Linux distribution.
Usage:
<no args>
Launches the u... | 36,706 | 65,387 | 2024-07-24 22:52:34 | 59,763,908 | 15 | 2020-01-16 06:10:16 | 65,387 | 2020-01-16 06:16:00 | https://stackoverflow.com/q/59744790 | https://stackoverflow.com/a/59763908 | <p>Turns out there's another command simply called <code>wsl</code> that lets you run arbitrary commands as arbitrary users:</p>
<pre><code>>wsl -u root -d Ubuntu-18.04 -- echo "I am g$USER"
I am groot
</code></pre>
<p>N.B. you need to use separate args (instead of a string) for this one.</p>
<p><code>-d</code> i... | <p>Turns out there's another command simply called <code>wsl</code> that lets you run arbitrary commands as arbitrary users:</p> <pre><code>>wsl -u root -d Ubuntu-18.04 -- echo "I am g$USER" I am groot </code></pre> <p>N.B. you need to use separate args (instead of a string) for this one.</p> <p><code>-d</code> i... | 387, 549, 107329, 119526 | bash, ubuntu, windows-10, windows-subsystem-for-linux | <h1>Bash/WSL - How to run command as root?</h1>
<pre><code>>ubuntu1804.exe -c "echo $USER"
mpen
</code></pre>
<p>That runs the command as me, how do I run it as root?</p>
<p>The help page doesn't even mention <code>-c</code> </p>
<pre><code>>ubuntu1804.exe help
Launches or configures a Linux distribution.
U... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,412 | bash | # Bash/WSL - How to run command as root?
```
>ubuntu1804.exe -c "echo $USER"
mpen
```
That runs the command as me, how do I run it as root?
The help page doesn't even mention `-c`
```
>ubuntu1804.exe help
Launches or configures a Linux distribution.
Usage:
<no args>
Launches the user's default shell in... | Turns out there's another command simply called `wsl` that lets you run arbitrary commands as arbitrary users:
```
>wsl -u root -d Ubuntu-18.04 -- echo "I am g$USER"
I am groot
```
N.B. you need to use separate args (instead of a string) for this one.
`-d` is optional. You can change the default distro like
```
wsl... |
59551619 | How to extract value from json contained in a variable using jq in bash | 7 | 2020-01-01 10:16:26 | <p>I am writing a bash script which has a json value stored in a variable now i want to extract the values in that json using Jq. The code used is. </p>
<pre><code>json_val={"code":"lyz1To6ZTWClDHSiaeXyxg","redirect_to":"http://example.com/client-redirect-uri?code=lyz1To6ZTWClDHSiaeXyxg"}
code_val= echo"$json_val" |... | 16,895 | 7,419,457 | 2022-05-11 15:36:46 | 59,551,649 | 15 | 2020-01-01 10:21:41 | 548,225 | 2020-01-01 10:32:53 | https://stackoverflow.com/q/59551619 | https://stackoverflow.com/a/59551649 | <p>You may use this:</p>
<pre><code>json_val='{"code":"lyz1To6ZTWClDHSiaeXyxg","redirect_to":"http://example.com/client-redirect-uri?code=lyz1To6ZTWClDHSiaeXyxg"}'
code_val=$(jq -r '.code' <<< "$json_val")
echo "$code_val"
</code></pre>
<p></p>
<pre><code>lyz1To6ZTWClDHSiaeXyxg
</code></pre>
<p>Note follow... | <p>You may use this:</p> <pre><code>json_val='{"code":"lyz1To6ZTWClDHSiaeXyxg","redirect_to":"http://example.com/client-redirect-uri?code=lyz1To6ZTWClDHSiaeXyxg"}' code_val=$(jq -r '.code' <<< "$json_val") echo "$code_val" </code></pre> <p></p> <pre><code>lyz1To6ZTWClDHSiaeXyxg </code></pre> <p>Note follow... | 58, 387, 390, 105170 | bash, jq, linux, shell | <h1>How to extract value from json contained in a variable using jq in bash</h1>
<p>I am writing a bash script which has a json value stored in a variable now i want to extract the values in that json using Jq. The code used is. </p>
<pre><code>json_val={"code":"lyz1To6ZTWClDHSiaeXyxg","redirect_to":"http://example.co... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,413 | bash | # How to extract value from json contained in a variable using jq in bash
I am writing a bash script which has a json value stored in a variable now i want to extract the values in that json using Jq. The code used is.
```
json_val={"code":"lyz1To6ZTWClDHSiaeXyxg","redirect_to":"http://example.com/client-redirect-uri... | You may use this:
```
json_val='{"code":"lyz1To6ZTWClDHSiaeXyxg","redirect_to":"http://example.com/client-redirect-uri?code=lyz1To6ZTWClDHSiaeXyxg"}'
code_val=$(jq -r '.code' <<< "$json_val")
echo "$code_val"
```
```
lyz1To6ZTWClDHSiaeXyxg
```
Note following changes:
- Wrap complete json string in single quotes
- u... |
49194078 | How to Disconnect VPN in Windows Via Powershell | 7 | 2018-03-09 12:42:48 | <p>I'm always connecting and disconnecting to my VPN and I have a powershell script that connects to the VPN profile and it's brilliant. I dont have to type anything just run it. </p>
<p>However, I always needed to disconnected via the convoluted GUI. </p>
<p>The awesome script I use to connect goes something like:</... | 18,149 | 5,142,580 | 2025-04-15 01:44:43 | 49,194,774 | 15 | 2018-03-09 13:22:08 | 5,403,693 | 2018-03-09 13:22:08 | https://stackoverflow.com/q/49194078 | https://stackoverflow.com/a/49194774 | <p><code>rasdial</code> has a parameter <code>/DISCONNECT</code> that should do what you want.</p>
<p>You could rewrite your script to do the disconnect like this:</p>
<pre><code>$vpnName = "MyVPN";
$vpn = Get-VpnConnection -Name $vpnName;
if($vpn.ConnectionStatus -eq "Connected"){
rasdial $vpnName /DISCONNECT;
}
... | <p><code>rasdial</code> has a parameter <code>/DISCONNECT</code> that should do what you want.</p> <p>You could rewrite your script to do the disconnect like this:</p> <pre><code>$vpnName = "MyVPN"; $vpn = Get-VpnConnection -Name $vpnName; if($vpn.ConnectionStatus -eq "Connected"){ rasdial $vpnName /DISCONNECT; } ... | 526, 633, 1362, 107329 | automation, powershell, vpn, windows-10 | <h1>How to Disconnect VPN in Windows Via Powershell</h1>
<p>I'm always connecting and disconnecting to my VPN and I have a powershell script that connects to the VPN profile and it's brilliant. I dont have to type anything just run it. </p>
<p>However, I always needed to disconnected via the convoluted GUI. </p>
<p>T... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,414 | bash | # How to Disconnect VPN in Windows Via Powershell
I'm always connecting and disconnecting to my VPN and I have a powershell script that connects to the VPN profile and it's brilliant. I dont have to type anything just run it.
However, I always needed to disconnected via the convoluted GUI.
The awesome script I use t... | `rasdial` has a parameter `/DISCONNECT` that should do what you want.
You could rewrite your script to do the disconnect like this:
```
$vpnName = "MyVPN";
$vpn = Get-VpnConnection -Name $vpnName;
if($vpn.ConnectionStatus -eq "Connected"){
rasdial $vpnName /DISCONNECT;
}
```
I haven't tested this, but it should w... |
48153565 | .Net StopWatch and Powershell | 7 | 2018-01-08 15:43:45 | <p>I have a powershell script that is currently running every 4 hours via task scheduler. It cleans a drive and when it's done it fires off an email to me telling me what it moved and where and the amount of time it took to perform this task. </p>
<p>However, I seem to be having issues with the time it displays at the... | 8,243 | 8,285,969 | 2018-01-08 17:26:13 | 48,155,134 | 15 | 2018-01-08 17:26:13 | 3,515,885 | 2018-01-08 17:26:13 | https://stackoverflow.com/q/48153565 | https://stackoverflow.com/a/48155134 | <p>Try using $StopWatch.Elapsed.TotalMinutes instead of $StopWatch.Elapsed.Minutes </p>
<p>The latter will not count beyond 59 so for a task that took 64 minutes to run, the Minutes property will only show 4. The Hours property in this particular example however would have increased to 1, up from 0.</p>
<p>You could ... | <p>Try using $StopWatch.Elapsed.TotalMinutes instead of $StopWatch.Elapsed.Minutes </p> <p>The latter will not count beyond 59 so for a task that took 64 minutes to run, the Minutes property will only show 4. The Hours property in this particular example however would have increased to 1, up from 0.</p> <p>You could ... | 1, 526, 6809 | .net, powershell, stopwatch | <h1>.Net StopWatch and Powershell</h1>
<p>I have a powershell script that is currently running every 4 hours via task scheduler. It cleans a drive and when it's done it fires off an email to me telling me what it moved and where and the amount of time it took to perform this task. </p>
<p>However, I seem to be having ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,415 | bash | # .Net StopWatch and Powershell
I have a powershell script that is currently running every 4 hours via task scheduler. It cleans a drive and when it's done it fires off an email to me telling me what it moved and where and the amount of time it took to perform this task.
However, I seem to be having issues with the t... | Try using $StopWatch.Elapsed.TotalMinutes instead of $StopWatch.Elapsed.Minutes
The latter will not count beyond 59 so for a task that took 64 minutes to run, the Minutes property will only show 4. The Hours property in this particular example however would have increased to 1, up from 0.
You could easily verify/try ... |
47144395 | Git Bash Inserts Tilde | 7 | 2017-11-06 19:32:11 | <p>Does anyone know what could be causing git bash to randomly insert the tilde character in the terminal window. </p>
<p>Also I am not sure if related, but when viewing log files in vim, the help dialog automatically opens in a split window in vim. </p>
<p>Does anyone know what the issue could be? I suspect it co... | 4,259 | 521,682 | 2022-08-14 05:34:32 | 47,183,365 | 15 | 2017-11-08 15:19:28 | 2,687,741 | 2017-11-08 15:19:28 | https://stackoverflow.com/q/47144395 | https://stackoverflow.com/a/47183365 | <p>Same as above answer. </p>
<p>Caffeine was causing it for me.<br>
What I did was add a command argument <code>-useshift</code> and this stopped it completely.</p>
<p>For more command line things: <a href="http://www.zhornsoftware.co.uk/caffeine/" rel="noreferrer">Caffeine command line arguments</a></p>
| <p>Same as above answer. </p> <p>Caffeine was causing it for me.<br> What I did was add a command argument <code>-useshift</code> and this stopped it completely.</p> <p>For more command line things: <a href="http://www.zhornsoftware.co.uk/caffeine/" rel="noreferrer">Caffeine command line arguments</a></p> | 370, 61874 | git-bash, vim | <h1>Git Bash Inserts Tilde</h1>
<p>Does anyone know what could be causing git bash to randomly insert the tilde character in the terminal window. </p>
<p>Also I am not sure if related, but when viewing log files in vim, the help dialog automatically opens in a split window in vim. </p>
<p>Does anyone know what the ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,416 | bash | # Git Bash Inserts Tilde
Does anyone know what could be causing git bash to randomly insert the tilde character in the terminal window.
Also I am not sure if related, but when viewing log files in vim, the help dialog automatically opens in a split window in vim.
Does anyone know what the issue could be? I suspect i... | Same as above answer.
Caffeine was causing it for me.
What I did was add a command argument `-useshift` and this stopped it completely.
For more command line things: [Caffeine command line arguments](http://www.zhornsoftware.co.uk/caffeine/) |
46853748 | How to make grep not interpret special characters in my search string? | 7 | 2017-10-20 16:49:19 | <p>When executing <code>./test.sh 12.34</code>, the grep should match <code>12.34</code> and not <code>12-34</code>. How can this be accomplished?</p>
<pre><code>#!/bin/sh
ip=$1
echo $ip
if netstat | grep ssh | grep $ip; then
netstat | grep ssh | grep $ip
else
echo 'No'
fi
</code></pre>
| 11,637 | 1,032,531 | 2017-10-20 17:48:29 | 46,853,946 | 15 | 2017-10-20 17:01:05 | 6,919,746 | 2017-10-20 17:25:47 | https://stackoverflow.com/q/46853748 | https://stackoverflow.com/a/46853946 | <p>You could use <code>grep</code> with the <code>-F</code> option:</p>
<p>From man grep:</p>
<pre><code> -F, --fixed-strings
Interpret pattern as a set of fixed strings (i.e. force grep to
behave as fgrep).
</code></pre>
<p>Your example:</p>
<pre><code>grep -F "$ip"
</code></pre>
| <p>You could use <code>grep</code> with the <code>-F</code> option:</p> <p>From man grep:</p> <pre><code> -F, --fixed-strings Interpret pattern as a set of fixed strings (i.e. force grep to behave as fgrep). </code></pre> <p>Your example:</p> <pre><code>grep -F "$ip" </code></pre> | 387, 1271, 4804 | bash, escaping, grep | <h1>How to make grep not interpret special characters in my search string?</h1>
<p>When executing <code>./test.sh 12.34</code>, the grep should match <code>12.34</code> and not <code>12-34</code>. How can this be accomplished?</p>
<pre><code>#!/bin/sh
ip=$1
echo $ip
if netstat | grep ssh | grep $ip; then
... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,417 | bash | # How to make grep not interpret special characters in my search string?
When executing `./test.sh 12.34`, the grep should match `12.34` and not `12-34`. How can this be accomplished?
```
#!/bin/sh
ip=$1
echo $ip
if netstat | grep ssh | grep $ip; then
netstat | grep ssh | grep $ip
else
echo 'No'
f... | You could use `grep` with the `-F` option:
From man grep:
```
-F, --fixed-strings
Interpret pattern as a set of fixed strings (i.e. force grep to
behave as fgrep).
```
Your example:
```
grep -F "$ip"
``` |
46814858 | Toast notification not working on Windows fall creators update | 7 | 2017-10-18 16:23:16 | <p>I have a <code>PowerShell</code> code, which I called the <code>.NET</code> reference for doing the toast notification, it works good at previous update. but when got the windows 10 fall creators (FCU) update, it's gone, the same code not working now:<br /></p>
<pre><code>$app = "HTML Report"
[Windows.UI.Notificati... | 10,574 | 7,453,565 | 2017-10-18 19:35:31 | 46,817,674 | 15 | 2017-10-18 19:19:42 | 170,183 | 2017-10-18 19:35:31 | https://stackoverflow.com/q/46814858 | https://stackoverflow.com/a/46817674 | <p>As mentioned in the comments, this is something that recently had to be addressed in the <a href="https://github.com/Windos/BurntToast/commit/674b80c9fbbd689a729c1fd2c3dedd386843a5a4" rel="noreferrer">BurntToast</a> module. There's a <a href="https://king.geek.nz/2017/10/09/burnttoast-no-appid/" rel="noreferrer">blo... | <p>As mentioned in the comments, this is something that recently had to be addressed in the <a href="https://github.com/Windos/BurntToast/commit/674b80c9fbbd689a729c1fd2c3dedd386843a5a4" rel="noreferrer">BurntToast</a> module. There's a <a href="https://king.geek.nz/2017/10/09/burnttoast-no-appid/" rel="noreferrer">blo... | 1, 64, 526 | .net, powershell, windows | <h1>Toast notification not working on Windows fall creators update</h1>
<p>I have a <code>PowerShell</code> code, which I called the <code>.NET</code> reference for doing the toast notification, it works good at previous update. but when got the windows 10 fall creators (FCU) update, it's gone, the same code not workin... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,418 | bash | # Toast notification not working on Windows fall creators update
I have a `PowerShell` code, which I called the `.NET` reference for doing the toast notification, it works good at previous update. but when got the windows 10 fall creators (FCU) update, it's gone, the same code not working now:
```
$app = "HTML Report... | As mentioned in the comments, this is something that recently had to be addressed in the [BurntToast](https://github.com/Windos/BurntToast/commit/674b80c9fbbd689a729c1fd2c3dedd386843a5a4) module. There's a [blog post](https://king.geek.nz/2017/10/09/burnttoast-no-appid/) that accompanies this change too, but I'll do my... |
46752794 | Why does wait generate “<pid> is not a child of this shell” error if a pipe is used afterwards? | 7 | 2017-10-15 07:38:15 | <p>In the following I create a background process and wait for it to complete. </p>
<pre><code>$ bash -c "sleep 5 | false" & wait $!
[1] 46950
[1]+ Exit 1 bash -c "sleep 5 | false"
$ echo $?
1
</code></pre>
<p>This works and the prompt returns after 5 seconds. </p>
<p>However, <code>wait</cod... | 14,236 | 5,771,861 | 2017-10-16 05:02:38 | 46,753,750 | 15 | 2017-10-15 09:52:49 | 404,556 | 2017-10-15 18:16:28 | https://stackoverflow.com/q/46752794 | https://stackoverflow.com/a/46753750 | <p>There are two key points to observe here:</p>
<ul>
<li><code>wait</code> (a shell built-in) can wait only (the shell's) children</li>
<li>each command in a pipeline runs in a separate subshell</li>
</ul>
<p>So, when you say:</p>
<pre><code>cmd & wait $!
</code></pre>
<p>then <code>cmd</code> is run in your c... | <p>There are two key points to observe here:</p> <ul> <li><code>wait</code> (a shell built-in) can wait only (the shell's) children</li> <li>each command in a pipeline runs in a separate subshell</li> </ul> <p>So, when you say:</p> <pre><code>cmd & wait $! </code></pre> <p>then <code>cmd</code> is run in your c... | 58, 387, 390, 2348, 5813 | bash, linux, pipe, shell, subprocess | <h1>Why does wait generate “<pid> is not a child of this shell” error if a pipe is used afterwards?</h1>
<p>In the following I create a background process and wait for it to complete. </p>
<pre><code>$ bash -c "sleep 5 | false" & wait $!
[1] 46950
[1]+ Exit 1 bash -c "sleep 5 | false"
$ echo $?... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,419 | bash | # Why does wait generate “ is not a child of this shell” error if a pipe is used afterwards?
In the following I create a background process and wait for it to complete.
```
$ bash -c "sleep 5 | false" & wait $!
[1] 46950
[1]+ Exit 1 bash -c "sleep 5 | false"
$ echo $?
1
```
This works and the pro... | There are two key points to observe here:
- `wait` (a shell built-in) can wait only (the shell's) children
- each command in a pipeline runs in a separate subshell
So, when you say:
```
cmd & wait $!
```
then `cmd` is run in your current shell, in background, and `wait` (being the shell's built-in) can wait on `cmd... |
43938414 | set FLASK_DEBUG=1 not working on Powershell | 7 | 2017-05-12 13:00:04 | <p>I'm building a Flask application and my file "<strong>helloworld.py</strong>" is:</p>
<pre><code>from flask import Flask
app = Flask(__name__)
@app.route('/home')
def hello_world():
return 'Home!'
@app.route('/about')
def about_us():
return 'aboutus!'
</code></pre>
<p>My Flask code after activating venv:... | 11,941 | 7,732,877 | 2022-08-02 14:55:33 | 43,939,856 | 15 | 2017-05-12 14:10:33 | 400,617 | 2022-08-02 14:55:33 | https://stackoverflow.com/q/43938414 | https://stackoverflow.com/a/43939856 | <p>The syntax for setting environment variables is different in PowerShell, use <code>$env:</code>.</p>
<pre class="lang-none prettyprint-override"><code>> $env:FLASK_APP = "helloworld.py"
> $env:FLASK_DEBUG = "1"
> flask run
</code></pre>
<p><code>set</code> is used for Windows CMD.</p>
<p... | <p>The syntax for setting environment variables is different in PowerShell, use <code>$env:</code>.</p> <pre class="lang-none prettyprint-override"><code>> $env:FLASK_APP = "helloworld.py" > $env:FLASK_DEBUG = "1" > flask run </code></pre> <p><code>set</code> is used for Windows CMD.</p> <p... | 16, 526, 54712 | flask, powershell, python | <h1>set FLASK_DEBUG=1 not working on Powershell</h1>
<p>I'm building a Flask application and my file "<strong>helloworld.py</strong>" is:</p>
<pre><code>from flask import Flask
app = Flask(__name__)
@app.route('/home')
def hello_world():
return 'Home!'
@app.route('/about')
def about_us():
return 'aboutus!'
<... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,420 | bash | # set FLASK_DEBUG=1 not working on Powershell
I'm building a Flask application and my file "**helloworld.py**" is:
```
from flask import Flask
app = Flask(__name__)
@app.route('/home')
def hello_world():
return 'Home!'
@app.route('/about')
def about_us():
return 'aboutus!'
```
My Flask code after activatin... | The syntax for setting environment variables is different in PowerShell, use `$env:`.
```
> $env:FLASK_APP = "helloworld.py"
> $env:FLASK_DEBUG = "1"
> flask run
```
`set` is used for Windows CMD.
```
> set FLASK_DEBUG=1
```
`export` is used by most other shells, like Bash and Zsh, such as on Linux and MacOS.
```
... |
37411988 | Move files that are 30 minutes old | 7 | 2016-05-24 11:16:11 | <p>I work on a server system that does not allow me to store files more than 50 gigabytes. My application takes 20 minutes to generate a file. Is there any way whereby I can move all the files that are more than 30 minutes old from source to destination? I tried <code>rsync</code>: </p>
<pre><code>rsync -avP source/... | 11,124 | 4,057,644 | 2016-05-24 13:41:42 | 37,412,139 | 15 | 2016-05-24 11:22:59 | 5,291,015 | 2016-05-24 11:59:40 | https://stackoverflow.com/q/37411988 | https://stackoverflow.com/a/37412139 | <p>You can use <code>find</code> along with <code>-exec</code> for this:-</p>
<p>Replace <code>/sourcedirectory</code> and <code>/destination/directory/</code> with the source and target paths as you need.</p>
<pre><code>find /sourcedirectory -maxdepth 1 -mmin -30 -type f -exec mv "{}" /destination/directory/ \;
</co... | <p>You can use <code>find</code> along with <code>-exec</code> for this:-</p> <p>Replace <code>/sourcedirectory</code> and <code>/destination/directory/</code> with the source and target paths as you need.</p> <pre><code>find /sourcedirectory -maxdepth 1 -mmin -30 -type f -exec mv "{}" /destination/directory/ \; </co... | 58, 387, 390, 549, 2829 | bash, csh, linux, shell, ubuntu | <h1>Move files that are 30 minutes old</h1>
<p>I work on a server system that does not allow me to store files more than 50 gigabytes. My application takes 20 minutes to generate a file. Is there any way whereby I can move all the files that are more than 30 minutes old from source to destination? I tried <code>rsync... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,421 | bash | # Move files that are 30 minutes old
I work on a server system that does not allow me to store files more than 50 gigabytes. My application takes 20 minutes to generate a file. Is there any way whereby I can move all the files that are more than 30 minutes old from source to destination? I tried `rsync`:
```
rsync -a... | You can use `find` along with `-exec` for this:-
Replace `/sourcedirectory` and `/destination/directory/` with the source and target paths as you need.
```
find /sourcedirectory -maxdepth 1 -mmin -30 -type f -exec mv "{}" /destination/directory/ \;
```
What basically the command does is, it tries to find files in th... |
35235707 | Bash - how to avoid command "eval set --" evaluating variables | 7 | 2016-02-06 00:19:30 | <p>I just write a little bash script for managing multiple parallels ssh commands.
In order to parse arguments I use this piece of code : </p>
<pre><code>#!/bin/bash
# replace long arguments
for arg in "$@"; do
case "$arg" in
--help) args="${args}-h ";;
--host|-hS) args="${args}-s ... | 20,089 | 2,447,053 | 2017-10-18 18:04:16 | 35,235,757 | 15 | 2016-02-06 00:25:12 | 14,122 | 2017-10-18 18:04:16 | https://stackoverflow.com/q/35235707 | https://stackoverflow.com/a/35235757 | <p>As you note, <A HREF="http://mywiki.wooledge.org/BashFAQ/048" rel="noreferrer"><code>eval</code> is evil</A> -- and there's no need to use it here.</p>
<pre><code>#!/bin/bash
# make args an array, not a string
args=( )
# replace long arguments
for arg; do
case "$arg" in
--help) args+=( -h ) ... | <p>As you note, <A HREF="http://mywiki.wooledge.org/BashFAQ/048" rel="noreferrer"><code>eval</code> is evil</A> -- and there's no need to use it here.</p> <pre><code>#!/bin/bash # make args an array, not a string args=( ) # replace long arguments for arg; do case "$arg" in --help) args+=( -h ) ... | 34, 276, 387, 2631, 4413 | bash, cmd, eval, unix, variables | <h1>Bash - how to avoid command "eval set --" evaluating variables</h1>
<p>I just write a little bash script for managing multiple parallels ssh commands.
In order to parse arguments I use this piece of code : </p>
<pre><code>#!/bin/bash
# replace long arguments
for arg in "$@"; do
case "$arg" in
--help) ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,422 | bash | # Bash - how to avoid command "eval set --" evaluating variables
I just write a little bash script for managing multiple parallels ssh commands.
In order to parse arguments I use this piece of code :
```
#!/bin/bash
# replace long arguments
for arg in "$@"; do
case "$arg" in
--help) args="${arg... | As you note, [`eval` is evil](http://mywiki.wooledge.org/BashFAQ/048) -- and there's no need to use it here.
```
#!/bin/bash
# make args an array, not a string
args=( )
# replace long arguments
for arg; do
case "$arg" in
--help) args+=( -h ) ;;
--host|-hS) args+=( -s ) ;;
... |
29334851 | Sed command not found | 7 | 2015-03-29 21:08:03 | <p>I have this code:</p>
<pre><code>if [ -d "$PATH" ]; then
ABSPATH=$( cd "`echo "$1" | sed 's/[^/]*$//'`";pwd)
fi
</code></pre>
<p>when I run it, I get this <code>sed: command not found</code>.Any command I put inside this "if" blog writes this message, XXX:command not found. I have no idea why. I have exactly the s... | 44,512 | 4,232,455 | 2015-03-29 21:18:43 | 29,334,955 | 15 | 2015-03-29 21:18:43 | 418,413 | 2015-03-29 21:18:43 | https://stackoverflow.com/q/29334851 | https://stackoverflow.com/a/29334955 | <p>The nature of your program* snippet implies that you have just overwritten <code>PATH</code>. <code>PATH</code> is an important <a href="http://pubs.opengroup.org/onlinepubs/7908799/xbd/envvar.html" rel="noreferrer">environment variable</a> that lets the shell know where to find commands… commands like <code>sed</co... | <p>The nature of your program* snippet implies that you have just overwritten <code>PATH</code>. <code>PATH</code> is an important <a href="http://pubs.opengroup.org/onlinepubs/7908799/xbd/envvar.html" rel="noreferrer">environment variable</a> that lets the shell know where to find commands… commands like <code>sed</co... | 387, 390 | bash, shell | <h1>Sed command not found</h1>
<p>I have this code:</p>
<pre><code>if [ -d "$PATH" ]; then
ABSPATH=$( cd "`echo "$1" | sed 's/[^/]*$//'`";pwd)
fi
</code></pre>
<p>when I run it, I get this <code>sed: command not found</code>.Any command I put inside this "if" blog writes this message, XXX:command not found. I have no... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,423 | bash | # Sed command not found
I have this code:
```
if [ -d "$PATH" ]; then
ABSPATH=$( cd "`echo "$1" | sed 's/[^/]*$//'`";pwd)
fi
```
when I run it, I get this `sed: command not found`.Any command I put inside this "if" blog writes this message, XXX:command not found. I have no idea why. I have exactly the same code else... | The nature of your program* snippet implies that you have just overwritten `PATH`. `PATH` is an important [environment variable](http://pubs.opengroup.org/onlinepubs/7908799/xbd/envvar.html) that lets the shell know where to find commands… commands like `sed`. If you overwrite it, `sed` will not be found.
Use another ... |
28857244 | bash: Split binary file at predefined positions | 7 | 2015-03-04 14:40:49 | <p>I have binary files which contain data structures <strong>of various length</strong>. I would like to save these blocks of data into separate files. The size of each block is known. The <code>split</code> command can, well, split a file but it does not stop after the first block of data. It slices the file into piec... | 9,847 | 1,395,359 | 2023-01-09 19:39:25 | 28,859,713 | 15 | 2015-03-04 16:29:43 | 2,836,621 | 2015-03-06 09:24:12 | https://stackoverflow.com/q/28857244 | https://stackoverflow.com/a/28859713 | <p>You can use two independent <code>dd</code> commands. One to seek arbitrarily, and another to copy arbitrary lengths.</p>
<pre><code>SEEK=501
BYTES=387
dd if=yourfile bs=$SEEK skip=1 | dd bs=$BYTES count=1 > lump.bin
</code></pre>
<p><strong>Note</strong>: Although counter-intuitive to what you are actually try... | <p>You can use two independent <code>dd</code> commands. One to seek arbitrarily, and another to copy arbitrary lengths.</p> <pre><code>SEEK=501 BYTES=387 dd if=yourfile bs=$SEEK skip=1 | dd bs=$BYTES count=1 > lump.bin </code></pre> <p><strong>Note</strong>: Although counter-intuitive to what you are actually try... | 368, 387, 2193 | bash, binary, split | <h1>bash: Split binary file at predefined positions</h1>
<p>I have binary files which contain data structures <strong>of various length</strong>. I would like to save these blocks of data into separate files. The size of each block is known. The <code>split</code> command can, well, split a file but it does not stop af... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,424 | bash | # bash: Split binary file at predefined positions
I have binary files which contain data structures **of various length**. I would like to save these blocks of data into separate files. The size of each block is known. The `split` command can, well, split a file but it does not stop after the first block of data. It s... | You can use two independent `dd` commands. One to seek arbitrarily, and another to copy arbitrary lengths.
```
SEEK=501
BYTES=387
dd if=yourfile bs=$SEEK skip=1 | dd bs=$BYTES count=1 > lump.bin
```
**Note**: Although counter-intuitive to what you are actually try to do, keep the blocksize high and the count low for ... |
27989736 | How do I make Powershell wait until a command is done before continuing? | 7 | 2015-01-16 17:43:59 |
<p>My script uninstalls a Windows Store app before installing the newer version. I need to make sure the uninstall is finished before installing, so how can I make sure I've waited long enough?</p>
<pre class="lang-powershell prettyprint-override"><code>Remove-Appxpackage MyAppName
# ~wait here~
Add-Appxpackage ... | 36,696 | 3,165,621 | 2015-01-16 18:51:16 | 27,990,646 | 15 | 2015-01-16 18:41:24 | null | 2015-01-16 18:41:24 | https://stackoverflow.com/q/27989736 | https://stackoverflow.com/a/27990646 | <p>
You can do this with the <a href="http://technet.microsoft.com/en-us/library/hh849698.aspx" rel="noreferrer"><code>Start-Job</code></a> and <a href="http://technet.microsoft.com/en-us/library/hh849735.aspx" rel="noreferrer"><code>Wait-Job</code></a> cmdlets:</p>
<pre class="lang-powershell prettyprint-override"><c... | <p> You can do this with the <a href="http://technet.microsoft.com/en-us/library/hh849698.aspx" rel="noreferrer"><code>Start-Job</code></a> and <a href="http://technet.microsoft.com/en-us/library/hh849735.aspx" rel="noreferrer"><code>Wait-Job</code></a> cmdlets:</p> <pre class="lang-powershell prettyprint-override"><c... | 526 | powershell | <h1>How do I make Powershell wait until a command is done before continuing?</h1>
<p>My script uninstalls a Windows Store app before installing the newer version. I need to make sure the uninstall is finished before installing, so how can I make sure I've waited long enough?</p>
<pre class="lang-powershell prettypri... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,425 | bash | # How do I make Powershell wait until a command is done before continuing?
My script uninstalls a Windows Store app before installing the newer version. I need to make sure the uninstall is finished before installing, so how can I make sure I've waited long enough?
```
Remove-Appxpackage MyAppName
# ~wait here~
A... | You can do this with the [`Start-Job`](http://technet.microsoft.com/en-us/library/hh849698.aspx) and [`Wait-Job`](http://technet.microsoft.com/en-us/library/hh849735.aspx) cmdlets:
```
Start-Job -Name Job1 -ScriptBlock { Remove-Appxpackage MyAppName }
Wait-Job -Name Job1
Add-Appxpackage .\PathToNewVersion
```
`Start-... |
25710640 | How to redirect grep output to a variable? | 7 | 2014-09-07 13:21:52 | <p>I have some pipe. For example, I have this pipe:</p>
<pre><code>user@user:~$ cal | head -1 | grep -oP "[A-Za-z]+"
</code></pre>
<p>For this pipe I get this result:</p>
<pre><code>September
</code></pre>
<p>I want to store this result to a variable. I write the following commands:</p>
<pre><code>user@user:~$ cal... | 23,321 | 1,756,750 | 2014-09-07 13:25:10 | 25,710,660 | 15 | 2014-09-07 13:24:48 | 3,776,858 | 2014-09-07 13:24:48 | https://stackoverflow.com/q/25710640 | https://stackoverflow.com/a/25710660 | <pre><code> month=$(cal | head -1 | grep -oP "[A-Za-z]+")
</code></pre>
<p>or</p>
<pre><code> month=$(date +%B)
</code></pre>
| <pre><code> month=$(cal | head -1 | grep -oP "[A-Za-z]+") </code></pre> <p>or</p> <pre><code> month=$(date +%B) </code></pre> | 276, 387, 1271, 5813, 84917 | bash, grep, output, pipe, variables | <h1>How to redirect grep output to a variable?</h1>
<p>I have some pipe. For example, I have this pipe:</p>
<pre><code>user@user:~$ cal | head -1 | grep -oP "[A-Za-z]+"
</code></pre>
<p>For this pipe I get this result:</p>
<pre><code>September
</code></pre>
<p>I want to store this result to a variable. I write the ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,426 | bash | # How to redirect grep output to a variable?
I have some pipe. For example, I have this pipe:
```
user@user:~$ cal | head -1 | grep -oP "[A-Za-z]+"
```
For this pipe I get this result:
```
September
```
I want to store this result to a variable. I write the following commands:
```
user@user:~$ cal | head -1 | mon... | ```
month=$(cal | head -1 | grep -oP "[A-Za-z]+")
```
or
```
month=$(date +%B)
``` |
25647806 | Running Shell Script From External Directory: No such file or directory | 7 | 2014-09-03 15:06:56 | <p>I have a shell script file that i want to run from java. My java work space directory is different than the script's directory. </p>
<pre><code>private final String scriptPath = "/home/kemallin/Desktop/";
public void cleanCSVScript() {
String script = "clean.sh";
try {
Process awk = new ProcessBui... | 25,914 | 2,523,672 | 2014-09-04 08:42:36 | 25,648,452 | 15 | 2014-09-03 15:39:24 | 252,858 | 2014-09-03 15:39:24 | https://stackoverflow.com/q/25647806 | https://stackoverflow.com/a/25648452 | <p>Your program <code>clean.sh</code> is not an executable as Java understands it, even though the underlying system understands it as executable.</p>
<p>You need to tell Java what shell is needed to execute your command. Do (assuming you are using <code>bash</code> and it is installed at <code>/bin/bash</code>):</p>
... | <p>Your program <code>clean.sh</code> is not an executable as Java understands it, even though the underlying system understands it as executable.</p> <p>You need to tell Java what shell is needed to execute your command. Do (assuming you are using <code>bash</code> and it is installed at <code>/bin/bash</code>):</p> ... | 17, 387, 390 | bash, java, shell | <h1>Running Shell Script From External Directory: No such file or directory</h1>
<p>I have a shell script file that i want to run from java. My java work space directory is different than the script's directory. </p>
<pre><code>private final String scriptPath = "/home/kemallin/Desktop/";
public void cleanCSVScript() ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,427 | bash | # Running Shell Script From External Directory: No such file or directory
I have a shell script file that i want to run from java. My java work space directory is different than the script's directory.
```
private final String scriptPath = "/home/kemallin/Desktop/";
public void cleanCSVScript() {
String script ... | Your program `clean.sh` is not an executable as Java understands it, even though the underlying system understands it as executable.
You need to tell Java what shell is needed to execute your command. Do (assuming you are using `bash` and it is installed at `/bin/bash`):
```
private final String scriptPath = "/home/k... |
25263521 | How to read and split comma separated file in a bash shell script? | 7 | 2014-08-12 11:48:29 | <p>I want to read a file line by line, split each line by comma (,) and store the result in an array. How to do this in a bash shell script?</p>
<p>Sample line in my comma separated file</p>
<pre><code>123,2014-07-21 10:01:44,123|8119|769.00||456|S
</code></pre>
<p>This should be the output after splitting:</p>
<pr... | 24,551 | 3,492,304 | 2014-08-12 11:58:35 | 25,263,615 | 15 | 2014-08-12 11:53:06 | 445,221 | 2014-08-12 11:58:35 | https://stackoverflow.com/q/25263521 | https://stackoverflow.com/a/25263615 | <p>Use <code>read -a</code> to split each line read into array based from IFS.</p>
<pre><code>while IFS=, read -ra arr; do
## Do something with ${arr0]}, ${arr[1]} and ${arr[2]}
...
done < file
</code></pre>
<p>If the third field can also contain commas, you can prevent it from being split by using finite ... | <p>Use <code>read -a</code> to split each line read into array based from IFS.</p> <pre><code>while IFS=, read -ra arr; do ## Do something with ${arr0]}, ${arr[1]} and ${arr[2]} ... done < file </code></pre> <p>If the third field can also contain commas, you can prevent it from being split by using finite ... | 114, 387, 390, 2193 | arrays, bash, shell, split | <h1>How to read and split comma separated file in a bash shell script?</h1>
<p>I want to read a file line by line, split each line by comma (,) and store the result in an array. How to do this in a bash shell script?</p>
<p>Sample line in my comma separated file</p>
<pre><code>123,2014-07-21 10:01:44,123|8119|769.00|... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,428 | bash | # How to read and split comma separated file in a bash shell script?
I want to read a file line by line, split each line by comma (,) and store the result in an array. How to do this in a bash shell script?
Sample line in my comma separated file
```
123,2014-07-21 10:01:44,123|8119|769.00||456|S
```
This should be ... | Use `read -a` to split each line read into array based from IFS.
```
while IFS=, read -ra arr; do
## Do something with ${arr0]}, ${arr[1]} and ${arr[2]}
...
done < file
```
If the third field can also contain commas, you can prevent it from being split by using finite non-array parameters:
```
while IFS=, re... |
23656267 | How to remove nth element from command arguments in bash | 7 | 2014-05-14 13:36:36 | <p>How to I remove the nth element from an argument list in bash?</p>
<p>Shift only appears to remove the first n, but I want to keep some of the first. I want something like:</p>
<pre><code>#!/bin/sh
set -x
echo $@
shift (from position 2)
echo $@
</code></pre>
<p>So when I call it - it removes "house" from the l... | 3,028 | 439,497 | 2019-07-03 05:23:09 | 23,656,370 | 15 | 2014-05-14 13:41:02 | 2,235,132 | 2014-05-14 14:02:21 | https://stackoverflow.com/q/23656267 | https://stackoverflow.com/a/23656370 | <p>Use the <a href="http://www.gnu.org/software/bash/manual/bashref.html#The-Set-Builtin" rel="noreferrer"><code>set</code></a> builtin and <a href="http://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html" rel="noreferrer">shell parameter expansion</a>:</p>
<pre><code>set -- "${@:1:1}" "${@:3}... | <p>Use the <a href="http://www.gnu.org/software/bash/manual/bashref.html#The-Set-Builtin" rel="noreferrer"><code>set</code></a> builtin and <a href="http://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html" rel="noreferrer">shell parameter expansion</a>:</p> <pre><code>set -- "${@:1:1}" "${@:3}... | 387, 13245 | bash, shift | <h1>How to remove nth element from command arguments in bash</h1>
<p>How to I remove the nth element from an argument list in bash?</p>
<p>Shift only appears to remove the first n, but I want to keep some of the first. I want something like:</p>
<pre><code>#!/bin/sh
set -x
echo $@
shift (from position 2)
echo $@
<... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,429 | bash | # How to remove nth element from command arguments in bash
How to I remove the nth element from an argument list in bash?
Shift only appears to remove the first n, but I want to keep some of the first. I want something like:
```
#!/bin/sh
set -x
echo $@
shift (from position 2)
echo $@
```
So when I call it - it ... | Use the [`set`](http://www.gnu.org/software/bash/manual/bashref.html#The-Set-Builtin) builtin and [shell parameter expansion](http://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html):
```
set -- "${@:1:1}" "${@:3}"
```
would remove the second positonal argument.
You could make it generic by ... |
23412774 | Linux sorting "ls -al" output by date | 7 | 2014-05-01 17:15:18 | <p>I want to sort the output of the "ls -al" command according to date. I am able to easily do that for one column with command: </p>
<pre><code>$ ls -al | sort -k6 -M -r
</code></pre>
<p>But how to do it for both collumn 6 and 7 simultaneously? The command:</p>
<pre><code>$ ls -al | sort -k6 -M -r | sort -k7 -r
</c... | 18,564 | 1,964,707 | 2024-10-13 04:34:28 | 23,412,887 | 15 | 2014-05-01 17:21:19 | 140,750 | 2021-03-04 21:50:58 | https://stackoverflow.com/q/23412774 | https://stackoverflow.com/a/23412887 | <p>With sort, if you specify <code>-k6</code>, the key starts at field 6 and extends to the end of the line. To truncate it and only use field 6, you should specify <code>-k6,6</code>. To sort on multiple keys, just specify <code>-k</code> multiple times. Also, you need to apply the M modifier only to the month, and... | <p>With sort, if you specify <code>-k6</code>, the key starts at field 6 and extends to the end of the line. To truncate it and only use field 6, you should specify <code>-k6,6</code>. To sort on multiple keys, just specify <code>-k</code> multiple times. Also, you need to apply the M modifier only to the month, and... | 58, 134, 387 | bash, linux, sorting | <h1>Linux sorting "ls -al" output by date</h1>
<p>I want to sort the output of the "ls -al" command according to date. I am able to easily do that for one column with command: </p>
<pre><code>$ ls -al | sort -k6 -M -r
</code></pre>
<p>But how to do it for both collumn 6 and 7 simultaneously? The command:</p>
<pre><c... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,430 | bash | # Linux sorting "ls -al" output by date
I want to sort the output of the "ls -al" command according to date. I am able to easily do that for one column with command:
```
$ ls -al | sort -k6 -M -r
```
But how to do it for both collumn 6 and 7 simultaneously? The command:
```
$ ls -al | sort -k6 -M -r | sort -k7 -r
`... | With sort, if you specify `-k6`, the key starts at field 6 and extends to the end of the line. To truncate it and only use field 6, you should specify `-k6,6`. To sort on multiple keys, just specify `-k` multiple times. Also, you need to apply the M modifier only to the month, and the n modifier to the day. So:
```
l... |
22803916 | bash string comparison fails | 7 | 2014-04-02 07:07:23 | <p>I have a variable that stores the output of netcat</p>
<pre><code>var=$(echo "flush_all" | nc localhost 111)
echo $var # outputs "OK"
if test "$var" != "OK"; then
echo "failed"
exit
fi
</code></pre>
<p>it outputs that it passed but when I want to programmatically check it is true, it fails. What is wrong w... | 6,988 | 2,260,362 | 2018-09-18 00:13:01 | 22,804,013 | 15 | 2014-04-02 07:12:03 | 2,235,132 | 2014-04-02 07:12:03 | https://stackoverflow.com/q/22803916 | https://stackoverflow.com/a/22804013 | <p>It seems that the variable contains a carriage return from the command substitution. You have a couple of options. Ensure that the string starts with <code>OK</code>:</p>
<pre><code>if [[ "$var" == "OK"* ]]; then
</code></pre>
<p>or, strip the CR during the variable assignment:</p>
<pre><code>var=$(echo "flush_... | <p>It seems that the variable contains a carriage return from the command substitution. You have a couple of options. Ensure that the string starts with <code>OK</code>:</p> <pre><code>if [[ "$var" == "OK"* ]]; then </code></pre> <p>or, strip the CR during the variable assignment:</p> <pre><code>var=$(echo "flush_... | 387 | bash | <h1>bash string comparison fails</h1>
<p>I have a variable that stores the output of netcat</p>
<pre><code>var=$(echo "flush_all" | nc localhost 111)
echo $var # outputs "OK"
if test "$var" != "OK"; then
echo "failed"
exit
fi
</code></pre>
<p>it outputs that it passed but when I want to programmatically check... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,431 | bash | # bash string comparison fails
I have a variable that stores the output of netcat
```
var=$(echo "flush_all" | nc localhost 111)
echo $var # outputs "OK"
if test "$var" != "OK"; then
echo "failed"
exit
fi
```
it outputs that it passed but when I want to programmatically check it is true, it fails. What is wr... | It seems that the variable contains a carriage return from the command substitution. You have a couple of options. Ensure that the string starts with `OK`:
```
if [[ "$var" == "OK"* ]]; then
```
or, strip the CR during the variable assignment:
```
var=$(echo "flush_all" | nc localhost 111 | tr -d '\r')
```
---
You... |
17754230 | Closing All Explorer Windows in PowerShell | 7 | 2013-07-19 19:41:47 | <p>I am writing the following code to close all explorer windows with PowerShell:</p>
<pre><code>(New-Object -comObject Shell.Application).Windows() |
? { $_.FullName -ne $null} |
? { $_.FullName.toLower().Endswith('\explorer.exe') } | % { $_.Quit() }
</code></pre>
<p>But it does not close out all the open windows.... | 7,279 | 2,600,767 | 2020-10-15 12:42:34 | 17,754,697 | 15 | 2013-07-19 20:12:40 | 520,612 | 2013-07-19 20:12:40 | https://stackoverflow.com/q/17754230 | https://stackoverflow.com/a/17754697 | <p>I think there's something in the pipeline that goes wrong.
This code works:</p>
<pre><code>$a = (New-Object -comObject Shell.Application).Windows() |
? { $_.FullName -ne $null} |
? { $_.FullName.toLower().Endswith('\explorer.exe') }
$a | % { $_.Quit() }
</code></pre>
| <p>I think there's something in the pipeline that goes wrong. This code works:</p> <pre><code>$a = (New-Object -comObject Shell.Application).Windows() | ? { $_.FullName -ne $null} | ? { $_.FullName.toLower().Endswith('\explorer.exe') } $a | % { $_.Quit() } </code></pre> | 526, 638, 24067 | explorer, powershell, powershell-2.0 | <h1>Closing All Explorer Windows in PowerShell</h1>
<p>I am writing the following code to close all explorer windows with PowerShell:</p>
<pre><code>(New-Object -comObject Shell.Application).Windows() |
? { $_.FullName -ne $null} |
? { $_.FullName.toLower().Endswith('\explorer.exe') } | % { $_.Quit() }
</code></pre>... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,432 | bash | # Closing All Explorer Windows in PowerShell
I am writing the following code to close all explorer windows with PowerShell:
```
(New-Object -comObject Shell.Application).Windows() |
? { $_.FullName -ne $null} |
? { $_.FullName.toLower().Endswith('\explorer.exe') } | % { $_.Quit() }
```
But it does not close out al... | I think there's something in the pipeline that goes wrong.
This code works:
```
$a = (New-Object -comObject Shell.Application).Windows() |
? { $_.FullName -ne $null} |
? { $_.FullName.toLower().Endswith('\explorer.exe') }
$a | % { $_.Quit() }
``` |
13925879 | What does $'\n' mean in bash? | 7 | 2012-12-18 03:36:12 | <p>An answer in this stackoverflow question <a href="https://stackoverflow.com/questions/5051556/in-a-linux-shell-how-can-i-process-each-line-of-a-multiline-string">In a Linux shell how can I process each line of a multiline string?</a> mentions that <code>$'\n'</code> is a special syntax "is not available in every she... | 11,846 | null | 2012-12-18 05:12:56 | 13,925,899 | 15 | 2012-12-18 03:38:05 | 147,356 | 2012-12-18 05:12:56 | https://stackoverflow.com/q/13925879 | https://stackoverflow.com/a/13925899 | <p>See the <code>QUOTING</code> section of the <code>bash</code> man page:</p>
<pre class="lang-none prettyprint-override"><code> Words of the form $'string' are treated specially. The word expands to
string, with backslash-escaped characters replaced as specified by the
ANSI C standard. Backslash escap... | <p>See the <code>QUOTING</code> section of the <code>bash</code> man page:</p> <pre class="lang-none prettyprint-override"><code> Words of the form $'string' are treated specially. The word expands to string, with backslash-escaped characters replaced as specified by the ANSI C standard. Backslash escap... | 34, 58, 387, 390 | bash, linux, shell, unix | <h1>What does $'\n' mean in bash?</h1>
<p>An answer in this stackoverflow question <a href="https://stackoverflow.com/questions/5051556/in-a-linux-shell-how-can-i-process-each-line-of-a-multiline-string">In a Linux shell how can I process each line of a multiline string?</a> mentions that <code>$'\n'</code> is a specia... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,433 | bash | # What does $'\n' mean in bash?
An answer in this stackoverflow question [In a Linux shell how can I process each line of a multiline string?](https://stackoverflow.com/questions/5051556/in-a-linux-shell-how-can-i-process-each-line-of-a-multiline-string) mentions that `$'\n'` is a special syntax "is not available in e... | See the `QUOTING` section of the `bash` man page:
```
Words of the form $'string' are treated specially. The word expands to
string, with backslash-escaped characters replaced as specified by the
ANSI C standard. Backslash escape sequences, if present, are decoded as
follows:
...
\n ... |
11238255 | here document and double backslash | 7 | 2012-06-28 04:51:34 | <p>If I use a here document in a shell script that contains multiple backslashes '\', the shell translates it into a single backslash. Can I work around this without changing the text ?</p>
<pre><code>$ cat <<EOF
> Print \\hello \\world
> EOF
Print \hello \world
</code></pre>
| 2,139 | 352,403 | 2023-12-24 09:19:17 | 11,238,274 | 15 | 2012-06-28 04:54:15 | 26,428 | 2012-06-28 04:54:15 | https://stackoverflow.com/q/11238255 | https://stackoverflow.com/a/11238274 | <p>Quote the beginning here document marker:</p>
<pre><code>cat <<'EOF'
Print \\hello \\world
EOF
</code></pre>
| <p>Quote the beginning here document marker:</p> <pre><code>cat <<'EOF' Print \\hello \\world EOF </code></pre> | 387, 390 | bash, shell | <h1>here document and double backslash</h1>
<p>If I use a here document in a shell script that contains multiple backslashes '\', the shell translates it into a single backslash. Can I work around this without changing the text ?</p>
<pre><code>$ cat <<EOF
> Print \\hello \\world
> EOF
Print \hello \w... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,434 | bash | # here document and double backslash
If I use a here document in a shell script that contains multiple backslashes '\', the shell translates it into a single backslash. Can I work around this without changing the text ?
```
$ cat <<EOF
> Print \\hello \\world
> EOF
Print \hello \world
``` | Quote the beginning here document marker:
```
cat <<'EOF'
Print \\hello \\world
EOF
``` |
10520605 | Bash's source command not working with a file curl'd from internet | 7 | 2012-05-09 16:53:58 | <p>I am trying to source a script file from the internet using curl, like this: <code>source <( curl url ); echo done</code> , and what I see is that 'done' is echoed <em>before</em> the curl even starts to download the file!</p>
<p>Here's the actual command and the output:</p>
<pre><code>-bash-3.2# source <( c... | 7,240 | 382,700 | 2015-08-28 03:05:41 | 10,527,064 | 15 | 2012-05-10 03:17:29 | 26,428 | 2012-05-12 07:27:11 | https://stackoverflow.com/q/10520605 | https://stackoverflow.com/a/10527064 | <p>At first, I failed to notice that you're using Bash 3.2. That version won't source from a process substitution, but later versions such as Bash 4 do.</p>
<p>You can save the file and do a normal source of it:</p>
<pre><code>source /tmp/del
</code></pre>
<p>(to use the file from your comment)</p>
<p>Or, you can u... | <p>At first, I failed to notice that you're using Bash 3.2. That version won't source from a process substitution, but later versions such as Bash 4 do.</p> <p>You can save the file and do a normal source of it:</p> <pre><code>source /tmp/del </code></pre> <p>(to use the file from your comment)</p> <p>Or, you can u... | 365, 387, 390 | bash, shell, url | <h1>Bash's source command not working with a file curl'd from internet</h1>
<p>I am trying to source a script file from the internet using curl, like this: <code>source <( curl url ); echo done</code> , and what I see is that 'done' is echoed <em>before</em> the curl even starts to download the file!</p>
<p>Here's ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,435 | bash | # Bash's source command not working with a file curl'd from internet
I am trying to source a script file from the internet using curl, like this: `source <( curl url ); echo done` , and what I see is that 'done' is echoed *before* the curl even starts to download the file!
Here's the actual command and the output:
`... | At first, I failed to notice that you're using Bash 3.2. That version won't source from a process substitution, but later versions such as Bash 4 do.
You can save the file and do a normal source of it:
```
source /tmp/del
```
(to use the file from your comment)
Or, you can use `/dev/stdin` and a here-string and a q... |
10152512 | What does "\2" mean at the end of a regular expression | 7 | 2012-04-14 09:27:24 | <p>I have the following assignment:</p>
<p>Words of a song are in a file called stairway.txt. Which of the following lines will be printed out after this command:
</p>
<pre class="lang-none prettyprint-override"><code>grep -E '(^.{4})(.{2}).*[ ]\2' stairway.txt
(a) Yes, there are two paths you can go by but in the l... | 8,399 | 1,279,707 | 2012-09-16 08:55:40 | 10,152,521 | 15 | 2012-04-14 09:29:02 | 330,644 | 2012-04-14 09:29:02 | https://stackoverflow.com/q/10152512 | https://stackoverflow.com/a/10152521 | <p>It is a backreference.</p>
<p>From <a href="http://www.selectorweb.com/grep_tutorial.html">http://www.selectorweb.com/grep_tutorial.html</a>:</p>
<blockquote>
<p>Backreference is an expression \n where n is a number. It matches the contents of the n'th set of parentheses in the expression.</p>
</blockquote>
<p... | <p>It is a backreference.</p> <p>From <a href="http://www.selectorweb.com/grep_tutorial.html">http://www.selectorweb.com/grep_tutorial.html</a>:</p> <blockquote> <p>Backreference is an expression \n where n is a number. It matches the contents of the n'th set of parentheses in the expression.</p> </blockquote> <p... | 18, 58, 387 | bash, linux, regex | <h1>What does "\2" mean at the end of a regular expression</h1>
<p>I have the following assignment:</p>
<p>Words of a song are in a file called stairway.txt. Which of the following lines will be printed out after this command:
</p>
<pre class="lang-none prettyprint-override"><code>grep -E '(^.{4})(.{2}).*[ ]\2' stair... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,436 | bash | # What does "\2" mean at the end of a regular expression
I have the following assignment:
Words of a song are in a file called stairway.txt. Which of the following lines will be printed out after this command:
```
grep -E '(^.{4})(.{2}).*[ ]\2' stairway.txt
(a) Yes, there are two paths you can go by but in the long... | It is a backreference.
From <http://www.selectorweb.com/grep_tutorial.html>:
> Backreference is an expression \n where n is a number. It matches the contents of the n'th set of parentheses in the expression.
Also, the answer is (d):
```
$ grep -E '(^.{4})(.{2}).*[ ]\2' test.txt
If there's a bustle in your hedgerow.... |
9063730 | How to change a word in a file with linux shell script | 7 | 2012-01-30 12:14:55 | <p>I have a text file which have lots of lines
I have a line in it which is:
MyCar on</p>
<p>how can I turn my car off?</p>
| 17,618 | 1,137,103 | 2021-01-28 07:08:53 | 9,063,772 | 15 | 2012-01-30 12:19:16 | 112,968 | 2012-01-30 12:19:16 | https://stackoverflow.com/q/9063730 | https://stackoverflow.com/a/9063772 | <p>You could use sed:</p>
<pre><code>sed -i 's/MyCar on/MyCar off/' path/to/file
</code></pre>
| <p>You could use sed:</p> <pre><code>sed -i 's/MyCar on/MyCar off/' path/to/file </code></pre> | 58, 390, 17938 | linux, shell, text-files | <h1>How to change a word in a file with linux shell script</h1>
<p>I have a text file which have lots of lines
I have a line in it which is:
MyCar on</p>
<p>how can I turn my car off?</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,437 | bash | # How to change a word in a file with linux shell script
I have a text file which have lots of lines
I have a line in it which is:
MyCar on
how can I turn my car off? | You could use sed:
```
sed -i 's/MyCar on/MyCar off/' path/to/file
``` |
8163922 | echo "string" > file in Windows PowerShell appends non-printable character to the file | 7 | 2011-11-17 08:11:39 | <p><strong>In Windows PowerShell:</strong></p>
<pre><code>echo "string" > file.txt
</code></pre>
<p><strong>In Cygwin:</strong></p>
<pre><code>$ cat file.txt
:::s t r i n g
$ dos2unix file.txt
dos2unix: Skipping binary file file.txt
</code></pre>
<p>I want a simple "string" in the file. How do I do it? I.e., w... | 11,259 | 1,051,289 | 2013-01-29 18:14:25 | 8,164,072 | 15 | 2011-11-17 08:26:04 | 1,021,945 | 2011-11-17 08:57:18 | https://stackoverflow.com/q/8163922 | https://stackoverflow.com/a/8164072 | <p>Try <code>echo "string" | out-file -encoding ASCII file.txt</code> to get a simple ASCII-encoded txt file.</p>
<p><strong>Comparison of the files produced:</strong></p>
<pre><code>echo "string" | out-file -encoding ASCII file.txt
</code></pre>
<p>will produce a file with the following contents:</p>
<pre><code>73... | <p>Try <code>echo "string" | out-file -encoding ASCII file.txt</code> to get a simple ASCII-encoded txt file.</p> <p><strong>Comparison of the files produced:</strong></p> <pre><code>echo "string" | out-file -encoding ASCII file.txt </code></pre> <p>will produce a file with the following contents:</p> <pre><code>73... | 526, 1731, 4113 | cygwin, dos2unix, powershell | <h1>echo "string" > file in Windows PowerShell appends non-printable character to the file</h1>
<p><strong>In Windows PowerShell:</strong></p>
<pre><code>echo "string" > file.txt
</code></pre>
<p><strong>In Cygwin:</strong></p>
<pre><code>$ cat file.txt
:::s t r i n g
$ dos2unix file.txt
dos2unix: Skipping binar... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,438 | bash | # echo "string" > file in Windows PowerShell appends non-printable character to the file
**In Windows PowerShell:**
```
echo "string" > file.txt
```
**In Cygwin:**
```
$ cat file.txt
:::s t r i n g
$ dos2unix file.txt
dos2unix: Skipping binary file file.txt
```
I want a simple "string" in the file. How do I do it... | Try `echo "string" | out-file -encoding ASCII file.txt` to get a simple ASCII-encoded txt file.
**Comparison of the files produced:**
```
echo "string" | out-file -encoding ASCII file.txt
```
will produce a file with the following contents:
```
73 74 72 69 6E 67 0D 0A (string..)
```
however
```
echo "string" > fi... |
7922854 | While Do Statement with blank/empty grep return? | 7 | 2011-10-27 21:48:12 | <p>This is the code for my foobar.sh:</p>
<pre><code>!#/bin/bash
while [ 1 ]
do
pid=`ps -ef | grep "mylittleprogram" | grep -v grep | awk ' {print $2}'`
echo $pid
if [ "$pid"="" ]
then
echo "Process has ended lets get this show on the road..."
exit
else
echo "Pro... | 39,107 | 940,469 | 2018-11-13 10:17:31 | 7,922,889 | 15 | 2011-10-27 21:52:31 | 947,357 | 2018-11-13 10:17:31 | https://stackoverflow.com/q/7922854 | https://stackoverflow.com/a/7922889 | <p>Instead of </p>
<pre><code>if [ "$pid"="" ]
</code></pre>
<p>please try</p>
<pre><code>if [ "$pid" = "" ]
</code></pre>
<p>The whitespace is around <code>=</code> is important. </p>
<p>You can also try</p>
<pre><code>if [ -z "$pid" ]
</code></pre>
| <p>Instead of </p> <pre><code>if [ "$pid"="" ] </code></pre> <p>please try</p> <pre><code>if [ "$pid" = "" ] </code></pre> <p>The whitespace is around <code>=</code> is important. </p> <p>You can also try</p> <pre><code>if [ -z "$pid" ] </code></pre> | 387, 390, 2773, 17310 | bash, if-statement, shell, while-loop | <h1>While Do Statement with blank/empty grep return?</h1>
<p>This is the code for my foobar.sh:</p>
<pre><code>!#/bin/bash
while [ 1 ]
do
pid=`ps -ef | grep "mylittleprogram" | grep -v grep | awk ' {print $2}'`
echo $pid
if [ "$pid"="" ]
then
echo "Process has ended lets get this show on th... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,439 | bash | # While Do Statement with blank/empty grep return?
This is the code for my foobar.sh:
```
!#/bin/bash
while [ 1 ]
do
pid=`ps -ef | grep "mylittleprogram" | grep -v grep | awk ' {print $2}'`
echo $pid
if [ "$pid"="" ]
then
echo "Process has ended lets get this show on the road..."
... | Instead of
```
if [ "$pid"="" ]
```
please try
```
if [ "$pid" = "" ]
```
The whitespace is around `=` is important.
You can also try
```
if [ -z "$pid" ]
``` |
5968107 | Get everything in a file after a grep'd string | 7 | 2011-05-11 17:19:24 | <p>Yesterday a situation came up where someone needed me to separate out the tail end of a file, specified as being everything after a particular string (for sake of argument, "FOO"). I needed to do this immediately so went with the option that I knew would work and disregarded The Right Way or The Best Way, and went ... | 9,366 | 144,642 | 2014-01-24 11:25:26 | 5,968,119 | 15 | 2011-05-11 17:21:13 | 643,977 | 2011-05-11 17:21:13 | https://stackoverflow.com/q/5968107 | https://stackoverflow.com/a/5968119 | <pre><code>sed -n '/re/,$p' file
</code></pre>
<p>is what occurs to me right off.</p>
| <pre><code>sed -n '/re/,$p' file </code></pre> <p>is what occurs to me right off.</p> | 34, 387, 390, 1271 | bash, grep, shell, unix | <h1>Get everything in a file after a grep'd string</h1>
<p>Yesterday a situation came up where someone needed me to separate out the tail end of a file, specified as being everything after a particular string (for sake of argument, "FOO"). I needed to do this immediately so went with the option that I knew would work ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,440 | bash | # Get everything in a file after a grep'd string
Yesterday a situation came up where someone needed me to separate out the tail end of a file, specified as being everything after a particular string (for sake of argument, "FOO"). I needed to do this immediately so went with the option that I knew would work and disreg... | ```
sed -n '/re/,$p' file
```
is what occurs to me right off. |
5650112 | How to replace string in files and file and folder names recursively with PowerShell? | 7 | 2011-04-13 13:33:04 | <p>With PowerShell (although other suggestions are welcome), how does one recursively loop a directory/folder and </p>
<ol>
<li>replace text A with B in all files, </li>
<li>rename all files so that A is replaced by B, and last </li>
<li>rename all folders also so that A is replaced by B?</li>
</ol>
| 12,405 | 46,343 | 2014-10-13 15:54:55 | 5,802,513 | 15 | 2011-04-27 10:18:58 | 46,343 | 2011-04-27 10:18:58 | https://stackoverflow.com/q/5650112 | https://stackoverflow.com/a/5802513 | <p>With a few requirements refinements, I ended up with this script:</p>
<pre><code>$match = "MyAssembly"
$replacement = Read-Host "Please enter a solution name"
$files = Get-ChildItem $(get-location) -filter *MyAssembly* -Recurse
$files |
Sort-Object -Descending -Property { $_.FullName } |
Rename-Item -new... | <p>With a few requirements refinements, I ended up with this script:</p> <pre><code>$match = "MyAssembly" $replacement = Read-Host "Please enter a solution name" $files = Get-ChildItem $(get-location) -filter *MyAssembly* -Recurse $files | Sort-Object -Descending -Property { $_.FullName } | Rename-Item -new... | 526, 34595 | powershell, windows-7 | <h1>How to replace string in files and file and folder names recursively with PowerShell?</h1>
<p>With PowerShell (although other suggestions are welcome), how does one recursively loop a directory/folder and </p>
<ol>
<li>replace text A with B in all files, </li>
<li>rename all files so that A is replaced by B, and l... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,441 | bash | # How to replace string in files and file and folder names recursively with PowerShell?
With PowerShell (although other suggestions are welcome), how does one recursively loop a directory/folder and
1. replace text A with B in all files,
2. rename all files so that A is replaced by B, and last
3. rename all folders a... | With a few requirements refinements, I ended up with this script:
```
$match = "MyAssembly"
$replacement = Read-Host "Please enter a solution name"
$files = Get-ChildItem $(get-location) -filter *MyAssembly* -Recurse
$files |
Sort-Object -Descending -Property { $_.FullName } |
Rename-Item -newname { $_.name... |
5376740 | bash command and return status | 7 | 2011-03-21 11:05:21 | <p>pkill return status > 0 if error ( for example if not found process ). How to return 0 status independing result of pkill ?</p>
| 4,284 | 418,507 | 2011-03-21 11:09:32 | 5,376,765 | 15 | 2011-03-21 11:07:10 | 616,700 | 2011-03-21 11:07:10 | https://stackoverflow.com/q/5376740 | https://stackoverflow.com/a/5376765 | <p>Either just don't test for the result, or do:</p>
<pre><code>pkill whatever || true
</code></pre>
| <p>Either just don't test for the result, or do:</p> <pre><code>pkill whatever || true </code></pre> | 387 | bash | <h1>bash command and return status</h1>
<p>pkill return status > 0 if error ( for example if not found process ). How to return 0 status independing result of pkill ?</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,442 | bash | # bash command and return status
pkill return status > 0 if error ( for example if not found process ). How to return 0 status independing result of pkill ? | Either just don't test for the result, or do:
```
pkill whatever || true
``` |
5344710 | recursive diff is extremely slow - checking contents of directories | 7 | 2011-03-17 20:17:25 | <p>I am running a diff on two directories, recursively, with a few options. The directories are somewhat large, however, I am trying to just see the differences in the contents of folders, not between the files, using the -q option (am i using this right?)</p>
<p>I have also tried rsync dry run, that seems to take equa... | 8,025 | 609,330 | 2020-11-05 10:34:39 | 5,344,869 | 15 | 2011-03-17 20:30:16 | 68,587 | 2015-03-23 00:00:43 | https://stackoverflow.com/q/5344710 | https://stackoverflow.com/a/5344869 | <p>When files are different <code>diff</code> will be able to figure that out fairly quickly. When they're the same, though, it has to scan the files in full to verify that they are indeed byte-for-byte identical.</p>
<p>If all you care about is differences in file names and don't want to inspect the contents of the f... | <p>When files are different <code>diff</code> will be able to figure that out fairly quickly. When they're the same, though, it has to scan the files in full to verify that they are indeed byte-for-byte identical.</p> <p>If all you care about is differences in file names and don't want to inspect the contents of the f... | 387, 606, 1159 | bash, diff, rsync | <h1>recursive diff is extremely slow - checking contents of directories</h1>
<p>I am running a diff on two directories, recursively, with a few options. The directories are somewhat large, however, I am trying to just see the differences in the contents of folders, not between the files, using the -q option (am i using... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,443 | bash | # recursive diff is extremely slow - checking contents of directories
I am running a diff on two directories, recursively, with a few options. The directories are somewhat large, however, I am trying to just see the differences in the contents of folders, not between the files, using the -q option (am i using this rig... | When files are different `diff` will be able to figure that out fairly quickly. When they're the same, though, it has to scan the files in full to verify that they are indeed byte-for-byte identical.
If all you care about is differences in file names and don't want to inspect the contents of the files, try something l... |
4644350 | Backspacing in Bash | 7 | 2011-01-10 06:49:15 | <p>How do you backspace the line you just wrote with bash and put a new one over its spot? I know it's possible, Aptitude (apt-get) use it for some of the updating stuff and it looks great.</p>
| 8,506 | 140,448 | 2024-02-08 23:43:47 | 4,644,497 | 15 | 2011-01-10 07:14:43 | 26,428 | 2011-01-10 07:14:43 | https://stackoverflow.com/q/4644350 | https://stackoverflow.com/a/4644497 | <p>Try this:</p>
<pre><code>$ printf "12345678\rABC\n"
ABC45678
</code></pre>
<p>As you can see, outputting a carriage return moves the cursor to the beginning of the same line.</p>
<p>You can clear the line like this:</p>
<pre><code>$ printf "12345678\r$(tput el)ABC\n"
ABC
</code></pre>
<p>Using <code>tput</code>... | <p>Try this:</p> <pre><code>$ printf "12345678\rABC\n" ABC45678 </code></pre> <p>As you can see, outputting a carriage return moves the cursor to the beginning of the same line.</p> <p>You can clear the line like this:</p> <pre><code>$ printf "12345678\r$(tput el)ABC\n" ABC </code></pre> <p>Using <code>tput</code>... | 387, 35759 | backspace, bash | <h1>Backspacing in Bash</h1>
<p>How do you backspace the line you just wrote with bash and put a new one over its spot? I know it's possible, Aptitude (apt-get) use it for some of the updating stuff and it looks great.</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,444 | bash | # Backspacing in Bash
How do you backspace the line you just wrote with bash and put a new one over its spot? I know it's possible, Aptitude (apt-get) use it for some of the updating stuff and it looks great. | Try this:
```
$ printf "12345678\rABC\n"
ABC45678
```
As you can see, outputting a carriage return moves the cursor to the beginning of the same line.
You can clear the line like this:
```
$ printf "12345678\r$(tput el)ABC\n"
ABC
```
Using `tput` gives you a portable way to send control characters to the terminal.... |
3680226 | How to read and extract information from a file that is being continuously updated? | 7 | 2010-09-09 20:14:01 | <p>This is how I am planning to build my utilities for a project :</p>
<ul>
<li><p><strong>logdump</strong> dumps log results to file <strong>log</strong>. The results are appended to the existing results if the file is already there (like if a new file is created every month, the results are appended to the same file... | 3,611 | 113,124 | 2010-09-09 22:49:44 | 3,680,237 | 15 | 2010-09-09 20:16:26 | 68,587 | 2010-09-09 20:16:26 | https://stackoverflow.com/q/3680226 | https://stackoverflow.com/a/3680237 | <p><code>tail -f</code> will read from a file and monitor it for updates when it reaches EOF instead of quitting outright. It's an easy way to read a log file "live". Could be as simple as:</p>
<pre><code>tail -f log.file | extract
</code></pre>
<p>Or maybe <code>tail -n 0 -f</code> so it only prints new lines, not e... | <p><code>tail -f</code> will read from a file and monitor it for updates when it reaches EOF instead of quitting outright. It's an easy way to read a log file "live". Could be as simple as:</p> <pre><code>tail -f log.file | extract </code></pre> <p>Or maybe <code>tail -n 0 -f</code> so it only prints new lines, not e... | 8, 10, 390, 580 | c, c++, perl, shell | <h1>How to read and extract information from a file that is being continuously updated?</h1>
<p>This is how I am planning to build my utilities for a project :</p>
<ul>
<li><p><strong>logdump</strong> dumps log results to file <strong>log</strong>. The results are appended to the existing results if the file is alread... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,445 | bash | # How to read and extract information from a file that is being continuously updated?
This is how I am planning to build my utilities for a project :
- **logdump** dumps log results to file **log**. The results are appended to the existing results if the file is already there (like if a new file is created every mont... | `tail -f` will read from a file and monitor it for updates when it reaches EOF instead of quitting outright. It's an easy way to read a log file "live". Could be as simple as:
```
tail -f log.file | extract
```
Or maybe `tail -n 0 -f` so it only prints new lines, not existing lines. Or `tail -n +0 -f` to display the ... |
74982074 | How to resolve 'curl: option --data-raw: is unknown' error | 6 | 2023-01-02 11:50:02 | <p>I am trying to run shell script with a curl command as below with --data-raw as body.</p>
<pre><code>curl --location --request POST '<URL>' \
--header 'Content-Type: application/json' \
--data-raw '{
"blocks": [
{
"type": "header",
"text": {
"type": &... | 29,696 | 2,509,396 | 2025-02-19 12:33:35 | 74,982,136 | 15 | 2023-01-02 11:57:05 | 465,183 | 2023-01-02 11:57:05 | https://stackoverflow.com/q/74982074 | https://stackoverflow.com/a/74982136 | <h4>Here, you have 2 issue.</h4>
<ul>
<li>your JSON is invalid, the <code>,</code> line 14 need to be removed</li>
<li>use <code>--data</code> and a <em>heredoc</em> :</li>
</ul>
<pre><code>curl --location --request POST '<URL>' \
--header 'Content-Type: application/json' \
--data "@/dev/stdin"<... | <h4>Here, you have 2 issue.</h4> <ul> <li>your JSON is invalid, the <code>,</code> line 14 need to be removed</li> <li>use <code>--data</code> and a <em>heredoc</em> :</li> </ul> <pre><code>curl --location --request POST '<URL>' \ --header 'Content-Type: application/json' \ --data "@/dev/stdin"<... | 390, 1554, 10327 | curl, sh, shell | <h1>How to resolve 'curl: option --data-raw: is unknown' error</h1>
<p>I am trying to run shell script with a curl command as below with --data-raw as body.</p>
<pre><code>curl --location --request POST '<URL>' \
--header 'Content-Type: application/json' \
--data-raw '{
"blocks": [
{
"type&q... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,446 | bash | # How to resolve 'curl: option --data-raw: is unknown' error
I am trying to run shell script with a curl command as below with --data-raw as body.
```
curl --location --request POST '<URL>' \
--header 'Content-Type: application/json' \
--data-raw '{
"blocks": [
{
"type": "header",
"text": {
"type": "plain_t... | #### Here, you have 2 issue.
- your JSON is invalid, the `,` line 14 need to be removed
- use `--data` and a *heredoc* :
```
curl --location --request POST '<URL>' \
--header 'Content-Type: application/json' \
--data "@/dev/stdin"<<EOF
{
"blocks": [
{
"type": "header",
"text": {
"type": ... |
70236670 | 'DEBIAN_FRONTEND=noninteractive' not working inside shell script with apt-get | 6 | 2021-12-05 17:15:36 | <p>I'm buildinga a docker image using a Dockerfile to build it. I have put <code>ARG DEBIAN_FRONTEND=noninteractive</code> in the beginning of the Dockerfile to avoid debconf warnings while building.</p>
<p>The warnings does not show up when using <code>apt-get install</code> inside the Dockerfile. However when executi... | 20,990 | 15,387,588 | 2021-12-05 18:12:38 | 70,236,753 | 15 | 2021-12-05 17:24:35 | 3,691,891 | 2021-12-05 17:24:35 | https://stackoverflow.com/q/70236670 | https://stackoverflow.com/a/70236753 | <p>Drop <code>sudo</code> in your script, there is point to use it if you're running as root. This is also the reason that DEBIAN_FRONTEND has no effect - sudo drops your current user's environment for security reasons, you'd have to use with -E option to make it work.</p>
| <p>Drop <code>sudo</code> in your script, there is point to use it if you're running as root. This is also the reason that DEBIAN_FRONTEND has no effect - sudo drops your current user's environment for security reasons, you'd have to use with -E option to make it work.</p> | 2080, 10327, 82135, 90304, 108477 | apt, debconf, docker, dockerfile, sh | <h1>'DEBIAN_FRONTEND=noninteractive' not working inside shell script with apt-get</h1>
<p>I'm buildinga a docker image using a Dockerfile to build it. I have put <code>ARG DEBIAN_FRONTEND=noninteractive</code> in the beginning of the Dockerfile to avoid debconf warnings while building.</p>
<p>The warnings does not show... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,447 | bash | # 'DEBIAN_FRONTEND=noninteractive' not working inside shell script with apt-get
I'm buildinga a docker image using a Dockerfile to build it. I have put `ARG DEBIAN_FRONTEND=noninteractive` in the beginning of the Dockerfile to avoid debconf warnings while building.
The warnings does not show up when using `apt-get in... | Drop `sudo` in your script, there is point to use it if you're running as root. This is also the reason that DEBIAN_FRONTEND has no effect - sudo drops your current user's environment for security reasons, you'd have to use with -E option to make it work. |
68308822 | Powershell: Cannot convert the "System.Collections.Hashtable" value of type "System.Collections.Hashtable" to type "System.Uri" | 6 | 2021-07-08 21:30:22 | <p>Goal: I want to send a POST API request to JIRA with irm (Invoke-RestMethod).</p>
<p>Environment:</p>
<ul>
<li>OS: Windows 10 64 bit</li>
<li>Powershell 5 (I think it's 5, it's the default that comes with Windows)</li>
</ul>
<p>Script:</p>
<pre><code>$Body = @{
'fields' = @{
'project' = @{'key' = 'ABC'}
... | 13,159 | 10,968,292 | 2021-07-08 21:41:39 | 68,308,920 | 15 | 2021-07-08 21:41:39 | 16,106,482 | 2021-07-08 21:41:39 | https://stackoverflow.com/q/68308822 | https://stackoverflow.com/a/68308920 | <p>Simply change the $params to @params, this is called splatting.</p>
<p>"Splatting is a method of passing a collection of parameter values to a command as a unit."</p>
<p><a href="https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_splatting?view=powershell-7.1" rel="no... | <p>Simply change the $params to @params, this is called splatting.</p> <p>"Splatting is a method of passing a collection of parameter values to a command as a unit."</p> <p><a href="https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_splatting?view=powershell-7.1" rel="no... | 526 | powershell | <h1>Powershell: Cannot convert the "System.Collections.Hashtable" value of type "System.Collections.Hashtable" to type "System.Uri"</h1>
<p>Goal: I want to send a POST API request to JIRA with irm (Invoke-RestMethod).</p>
<p>Environment:</p>
<ul>
<li>OS: Windows 10 64 bit</li>
<li>Powershell 5 (I think it's 5, it's the... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,448 | bash | # Powershell: Cannot convert the "System.Collections.Hashtable" value of type "System.Collections.Hashtable" to type "System.Uri"
Goal: I want to send a POST API request to JIRA with irm (Invoke-RestMethod).
Environment:
- OS: Windows 10 64 bit
- Powershell 5 (I think it's 5, it's the default that comes with Windows... | Simply change the $params to @params, this is called splatting.
"Splatting is a method of passing a collection of parameter values to a command as a unit."
<https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_splatting?view=powershell-7.1>
```
$response = irm @params
``` |
66780525 | Exporting an env-file with values containing space | 6 | 2021-03-24 11:56:15 | <p>I'm using environment files to configure web apps. Recently i had the need to export a value like this:</p>
<pre><code>RUBYOPT='-W:no-derecated -W:no-experimental'
</code></pre>
<p>This is contained in a file <code>test.env</code> with other config vars.</p>
<p>I use this command to export all the env vars in the fi... | 5,951 | 109,274 | 2021-03-24 12:41:16 | 66,780,625 | 15 | 2021-03-24 12:02:55 | 7,582,247 | 2021-03-24 12:41:16 | https://stackoverflow.com/q/66780525 | https://stackoverflow.com/a/66780625 | <p>The construct with <code>export $(cat test.env | xargs)</code> is very fragile and you get shell interpretation of the <code>'</code> characters (and other special characters) so <code>RUBYOPT='-W:no-derecated -W:no-experimental'</code> therefore becomes <code>RUBYOPT=-W:no-derecated -W:no-experimental</code>. Note... | <p>The construct with <code>export $(cat test.env | xargs)</code> is very fragile and you get shell interpretation of the <code>'</code> characters (and other special characters) so <code>RUBYOPT='-W:no-derecated -W:no-experimental'</code> therefore becomes <code>RUBYOPT=-W:no-derecated -W:no-experimental</code>. Note... | 387, 390, 9013, 10804, 31134 | bash, command-line-arguments, environment-variables, quoting, shell | <h1>Exporting an env-file with values containing space</h1>
<p>I'm using environment files to configure web apps. Recently i had the need to export a value like this:</p>
<pre><code>RUBYOPT='-W:no-derecated -W:no-experimental'
</code></pre>
<p>This is contained in a file <code>test.env</code> with other config vars.</p... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,449 | bash | # Exporting an env-file with values containing space
I'm using environment files to configure web apps. Recently i had the need to export a value like this:
```
RUBYOPT='-W:no-derecated -W:no-experimental'
```
This is contained in a file `test.env` with other config vars.
I use this command to export all the env va... | The construct with `export $(cat test.env | xargs)` is very fragile and you get shell interpretation of the `'` characters (and other special characters) so `RUBYOPT='-W:no-derecated -W:no-experimental'` therefore becomes `RUBYOPT=-W:no-derecated -W:no-experimental`. Note the missing `'`. This was not a problem until y... |
61571006 | PowerShell JSON string escape (backslash) | 6 | 2020-05-03 07:29:11 | <p>I need to HttpPost a Json-body to a ASP.NET Core Web Api endpoint (controller) using a PowerShell script. </p>
<pre><code>$CurrentWindowsIdentity = New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())
$CurrentPrincipalName = $CurrentWindowsIdentity.Identity.Name
# Buil... | 19,204 | 270,085 | 2023-08-10 15:45:46 | 61,571,069 | 15 | 2020-05-03 07:36:35 | 45,375 | 2023-08-10 15:45:46 | https://stackoverflow.com/q/61571006 | https://stackoverflow.com/a/61571069 |
<p>The robust way to create JSON text is to <strong>construct your data as a hash table (<code>@{ ... }</code>) or custom object ( <code>[pscustomobject] @{ ... }</code>)</strong> first and <strong>pipe to <a href="https://learn.microsoft.com/en-us/powershell/module/Microsoft.PowerShell.Utility/ConvertTo-Json" rel="no... | <p>The robust way to create JSON text is to <strong>construct your data as a hash table (<code>@{ ... }</code>) or custom object ( <code>[pscustomobject] @{ ... }</code>)</strong> first and <strong>pipe to <a href="https://learn.microsoft.com/en-us/powershell/module/Microsoft.PowerShell.Utility/ConvertTo-Json" rel="no... | 526, 1508 | json, powershell | <h1>PowerShell JSON string escape (backslash)</h1>
<p>I need to HttpPost a Json-body to a ASP.NET Core Web Api endpoint (controller) using a PowerShell script. </p>
<pre><code>$CurrentWindowsIdentity = New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())
$CurrentPrincipalN... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,450 | bash | # PowerShell JSON string escape (backslash)
I need to HttpPost a Json-body to a ASP.NET Core Web Api endpoint (controller) using a PowerShell script.
```
$CurrentWindowsIdentity = New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())
$CurrentPrincipalName = $CurrentWindows... | The robust way to create JSON text is to **construct your data as a hash table (`@{ ... }`) or custom object ( `[pscustomobject] @{ ... }`)** first and **pipe to [`ConvertTo-Json`](https://learn.microsoft.com/en-us/powershell/module/Microsoft.PowerShell.Utility/ConvertTo-Json)**:
```
$JsonString = @{
CurrentPrincipa... |
60506222 | encode / decode binary data in a qr-code using qrencode and zbarimg in bash | 6 | 2020-03-03 11:26:34 | <p>I have some binary data that I want to encode in a qr-code and then be able to decode, all of that in bash. After a search, it looks like I should use <code>qrencode</code> for encoding, and <code>zbarimg</code> for decoding. After a bit of troubleshooting, I still do not manage to decode what I had encoded</p>
<p>A... | 16,867 | 5,958,323 | 2024-02-22 21:27:29 | 60,518,608 | 15 | 2020-03-04 03:22:20 | 512,904 | 2020-04-29 03:34:33 | https://stackoverflow.com/q/60506222 | https://stackoverflow.com/a/60518608 | <p>My pull request has been <a href="https://github.com/mchehab/zbar/pull/64#issuecomment-598644895" rel="noreferrer">applied</a>. ZBar <a href="https://github.com/mchehab/zbar/releases/tag/0.23.1" rel="noreferrer">version 0.23.1</a> and newer will be able to decode binary QR codes:</p>
<pre><code>zbarimg --raw --onesh... | <p>My pull request has been <a href="https://github.com/mchehab/zbar/pull/64#issuecomment-598644895" rel="noreferrer">applied</a>. ZBar <a href="https://github.com/mchehab/zbar/releases/tag/0.23.1" rel="noreferrer">version 0.23.1</a> and newer will be able to decode binary QR codes:</p> <pre><code>zbarimg --raw --onesh... | 368, 387, 1951, 4387, 4951 | bash, binary, decode, encode, qr-code | <h1>encode / decode binary data in a qr-code using qrencode and zbarimg in bash</h1>
<p>I have some binary data that I want to encode in a qr-code and then be able to decode, all of that in bash. After a search, it looks like I should use <code>qrencode</code> for encoding, and <code>zbarimg</code> for decoding. After ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,451 | bash | # encode / decode binary data in a qr-code using qrencode and zbarimg in bash
I have some binary data that I want to encode in a qr-code and then be able to decode, all of that in bash. After a search, it looks like I should use `qrencode` for encoding, and `zbarimg` for decoding. After a bit of troubleshooting, I sti... | My pull request has been [applied](https://github.com/mchehab/zbar/pull/64#issuecomment-598644895). ZBar [version 0.23.1](https://github.com/mchehab/zbar/releases/tag/0.23.1) and newer will be able to decode binary QR codes:
```
zbarimg --raw --oneshot -Sbinary qr.png
zbarcam --raw --oneshot -Sbinary
```
---
QR code... |
54289105 | List all folders and subfolders in a given structure with filesize | 6 | 2019-01-21 11:33:27 | <p>I'm trying to list the folderstructure of a disc and each folders size.</p>
<p>I've got the folderstructure down, now i just need to output each folders size. </p>
<p>According to <a href="https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/dir" rel="noreferrer">https://learn.microsoft... | 37,509 | 2,902,996 | 2021-09-08 18:04:53 | 54,297,192 | 15 | 2019-01-21 20:15:57 | 45,375 | 2021-09-08 18:04:53 | https://stackoverflow.com/q/54289105 | https://stackoverflow.com/a/54297192 |
<p>A <strong>PowerShell solution</strong> that builds on <a href="https://stackoverflow.com/a/54289749/45375">montonero's helpful answer</a> and improves the following aspects:</p>
<ul>
<li>control over the recursion depth</li>
<li>improved performance</li>
<li>better integration with other cmdlets for composable func... | <p>A <strong>PowerShell solution</strong> that builds on <a href="https://stackoverflow.com/a/54289749/45375">montonero's helpful answer</a> and improves the following aspects:</p> <ul> <li>control over the recursion depth</li> <li>improved performance</li> <li>better integration with other cmdlets for composable func... | 64, 526, 1231, 2631 | cmd, command-line, powershell, windows | <h1>List all folders and subfolders in a given structure with filesize</h1>
<p>I'm trying to list the folderstructure of a disc and each folders size.</p>
<p>I've got the folderstructure down, now i just need to output each folders size. </p>
<p>According to <a href="https://learn.microsoft.com/en-us/windows-server/a... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,452 | bash | # List all folders and subfolders in a given structure with filesize
I'm trying to list the folderstructure of a disc and each folders size.
I've got the folderstructure down, now i just need to output each folders size.
According to <https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/d... | A **PowerShell solution** that builds on [montonero's helpful answer](https://stackoverflow.com/a/54289749/45375) and improves the following aspects:
- control over the recursion depth
- improved performance
- better integration with other cmdlets for composable functionality
Sample calls, based on function `Get-Dire... |
53921672 | Splitting a list in bash | 6 | 2018-12-25 10:53:51 | <p>I have this script:</p>
<pre><code>#!/bin/bash
list="a b c d"
for item in ${list[@]}; do
echo "${item}"
done
</code></pre>
<p>When I run it this is the output:</p>
<pre><code>a
b
c
d
</code></pre>
<p>This is <strong>exactly</strong> what I want. However, <code>shellcheck</code> hates this and throws an error... | 5,168 | 3,691,698 | 2022-05-09 20:31:38 | 53,921,691 | 15 | 2018-12-25 10:56:04 | 5,958,455 | 2018-12-25 11:38:24 | https://stackoverflow.com/q/53921672 | https://stackoverflow.com/a/53921691 | <p>This is not an array:</p>
<pre><code>list="a b c d"
</code></pre>
<p>You're just assigning <code>list</code> to a string of length 7.</p>
<p>To make it a real array:</p>
<pre><code>list=(a b c d)
</code></pre>
<p>Then with <code>for item in "${list[@]}"</code>, you get the correct result.</p>
<hr>
<p>For your... | <p>This is not an array:</p> <pre><code>list="a b c d" </code></pre> <p>You're just assigning <code>list</code> to a string of length 7.</p> <p>To make it a real array:</p> <pre><code>list=(a b c d) </code></pre> <p>Then with <code>for item in "${list[@]}"</code>, you get the correct result.</p> <hr> <p>For your... | 387, 117067 | bash, shellcheck | <h1>Splitting a list in bash</h1>
<p>I have this script:</p>
<pre><code>#!/bin/bash
list="a b c d"
for item in ${list[@]}; do
echo "${item}"
done
</code></pre>
<p>When I run it this is the output:</p>
<pre><code>a
b
c
d
</code></pre>
<p>This is <strong>exactly</strong> what I want. However, <code>shellcheck</co... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,453 | bash | # Splitting a list in bash
I have this script:
```
#!/bin/bash
list="a b c d"
for item in ${list[@]}; do
echo "${item}"
done
```
When I run it this is the output:
```
a
b
c
d
```
This is **exactly** what I want. However, `shellcheck` hates this and throws an error:
```
for item in ${list[@]}; do
^... | This is not an array:
```
list="a b c d"
```
You're just assigning `list` to a string of length 7.
To make it a real array:
```
list=(a b c d)
```
Then with `for item in "${list[@]}"`, you get the correct result.
---
For your updated question, you should just use `$list` instead of `${list[@]}`, because `list` i... |
51493815 | Powershell capture first filename from a folder | 6 | 2018-07-24 08:20:40 | <p>Newbie to powershell
I need to capture first file name from a directory. However my current script captures all file names. Please suggest changes to my code below.</p>
<pre><code># Storing path of the desired folder
$path = "C:\foo\bar\"
$contents = Get-ChildItem -Path $path -Force -Recurse
$contents.Name
</code... | 21,133 | 5,810,015 | 2020-06-25 05:14:30 | 51,493,908 | 15 | 2018-07-24 08:25:58 | 10,071,078 | 2020-06-25 05:14:30 | https://stackoverflow.com/q/51493815 | https://stackoverflow.com/a/51493908 | <p>You could use Select-Object with the -first switch and set it to 1</p>
<pre><code>$path = "C:\foo\bar\"
$contents = Get-ChildItem -Path $path -Force -Recurse -File | Select-Object -First 1
</code></pre>
<p>I've added the -File switch to <code>Get-ChildItem</code> as well, since you only want to return file... | <p>You could use Select-Object with the -first switch and set it to 1</p> <pre><code>$path = "C:\foo\bar\" $contents = Get-ChildItem -Path $path -Force -Recurse -File | Select-Object -First 1 </code></pre> <p>I've added the -File switch to <code>Get-ChildItem</code> as well, since you only want to return file... | 526 | powershell | <h1>Powershell capture first filename from a folder</h1>
<p>Newbie to powershell
I need to capture first file name from a directory. However my current script captures all file names. Please suggest changes to my code below.</p>
<pre><code># Storing path of the desired folder
$path = "C:\foo\bar\"
$contents = Get-Ch... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,454 | bash | # Powershell capture first filename from a folder
Newbie to powershell
I need to capture first file name from a directory. However my current script captures all file names. Please suggest changes to my code below.
```
# Storing path of the desired folder
$path = "C:\foo\bar\"
$contents = Get-ChildItem -Path $path ... | You could use Select-Object with the -first switch and set it to 1
```
$path = "C:\foo\bar\"
$contents = Get-ChildItem -Path $path -Force -Recurse -File | Select-Object -First 1
```
I've added the -File switch to `Get-ChildItem` as well, since you only want to return files. |
50765949 | redirect stdout, stderr from powershell script as admin through start-process | 6 | 2018-06-08 17:43:59 | <p>Inside a powershell script, I'm running a command which starts a new powershell as admin (if I'm not and if needed, depending on <code>$arg</code>) and then runs the script.</p>
<p>I'm trying to redirect stdout and stderr to the first terminal.</p>
<p>Not trying to make things easier, there are arguments too.</p>
... | 7,094 | 1,447,389 | 2024-10-28 20:43:58 | 50,770,757 | 15 | 2018-06-09 03:53:51 | 45,375 | 2024-10-28 20:43:58 | https://stackoverflow.com/q/50765949 | https://stackoverflow.com/a/50770757 | <p>PowerShell's <a href="https://learn.microsoft.com/en-us/powershell/module/Microsoft.PowerShell.Management/Start-Process" rel="nofollow noreferrer"><code>Start-Process</code></a> cmdlet:</p>
<ul>
<li>does have <code>-RedirectStandardOut</code> and <code>-RedirectStandardError</code> parameters,</li>
<li>but <em>synta... | <p>PowerShell's <a href="https://learn.microsoft.com/en-us/powershell/module/Microsoft.PowerShell.Management/Start-Process" rel="nofollow noreferrer"><code>Start-Process</code></a> cmdlet:</p> <ul> <li>does have <code>-RedirectStandardOut</code> and <code>-RedirectStandardError</code> parameters,</li> <li>but <em>synta... | 526, 26462 | powershell, start-process | <h1>redirect stdout, stderr from powershell script as admin through start-process</h1>
<p>Inside a powershell script, I'm running a command which starts a new powershell as admin (if I'm not and if needed, depending on <code>$arg</code>) and then runs the script.</p>
<p>I'm trying to redirect stdout and stderr to the ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,455 | bash | # redirect stdout, stderr from powershell script as admin through start-process
Inside a powershell script, I'm running a command which starts a new powershell as admin (if I'm not and if needed, depending on `$arg`) and then runs the script.
I'm trying to redirect stdout and stderr to the first terminal.
Not trying... | PowerShell's [`Start-Process`](https://learn.microsoft.com/en-us/powershell/module/Microsoft.PowerShell.Management/Start-Process) cmdlet:
- does have `-RedirectStandardOut` and `-RedirectStandardError` parameters,
- but *syntactically* they cannot be combined with `-Verb Runas`, the argument required to start a proces... |
45856411 | Exclude a directory from find linux | 6 | 2017-08-24 08:17:41 | <p>I want to exclude all directories from the <code>find</code> command target. I can use this:</p>
<pre><code>find / -not -path /my/path -name name
</code></pre>
<p>But this still keep looking at all subdirectories of <code>/my/path</code>. Is there a way to exclude the directory and all its subdirectories from <cod... | 25,149 | 2,786,156 | 2018-08-31 04:00:14 | 45,856,447 | 15 | 2017-08-24 08:19:42 | 1,454,708 | 2017-08-24 08:19:42 | https://stackoverflow.com/q/45856411 | https://stackoverflow.com/a/45856447 | <p>with <code>-prune</code></p>
<pre><code>find . -name directory_to_exclude -prune -o ...
</code></pre>
<p>to exclude many directories</p>
<pre><code>find . \( -name dir1_to_exclude -o -name dir2 ... \) -prune -o ...
</code></pre>
| <p>with <code>-prune</code></p> <pre><code>find . -name directory_to_exclude -prune -o ... </code></pre> <p>to exclude many directories</p> <pre><code>find . \( -name dir1_to_exclude -o -name dir2 ... \) -prune -o ... </code></pre> | 58, 387, 10193 | bash, find, linux | <h1>Exclude a directory from find linux</h1>
<p>I want to exclude all directories from the <code>find</code> command target. I can use this:</p>
<pre><code>find / -not -path /my/path -name name
</code></pre>
<p>But this still keep looking at all subdirectories of <code>/my/path</code>. Is there a way to exclude the d... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,456 | bash | # Exclude a directory from find linux
I want to exclude all directories from the `find` command target. I can use this:
```
find / -not -path /my/path -name name
```
But this still keep looking at all subdirectories of `/my/path`. Is there a way to exclude the directory and all its subdirectories from `find`? | with `-prune`
```
find . -name directory_to_exclude -prune -o ...
```
to exclude many directories
```
find . \( -name dir1_to_exclude -o -name dir2 ... \) -prune -o ...
``` |
45593418 | Register DLL in GAC (CMD or PowerShell) | 6 | 2017-08-09 14:22:59 | <p>I'm trying to register a <code>.DLL</code> in the <code>GAC</code>.
Currently I'm having trouble to prove it has been added to the assembly.</p>
<p>Using the command</p>
<blockquote>
<p>C:\Windows\System32>%programfiles(x86)%\Microsoft
SDKs\Windows\v7.0A\Bin\gacutil.exe -i "path\to\my\file.dll"</p>
</blockquot... | 36,744 | 8,440,300 | 2022-04-14 16:20:18 | 45,594,261 | 15 | 2017-08-09 15:00:58 | 2,829,492 | 2017-08-09 15:00:58 | https://stackoverflow.com/q/45593418 | https://stackoverflow.com/a/45594261 | <p>Remember to run PowerShell as administrator or this won't work.</p>
<pre><code>$dllpath = c:\path\yourdll.dll
[System.Reflection.Assembly]::Load("System.EnterpriseServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")
$publish = New-Object System.EnterpriseServices.Internal.Publis... | <p>Remember to run PowerShell as administrator or this won't work.</p> <pre><code>$dllpath = c:\path\yourdll.dll [System.Reflection.Assembly]::Load("System.EnterpriseServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a") $publish = New-Object System.EnterpriseServices.Internal.Publis... | 64, 457, 526, 2640 | dll, gac, powershell, windows | <h1>Register DLL in GAC (CMD or PowerShell)</h1>
<p>I'm trying to register a <code>.DLL</code> in the <code>GAC</code>.
Currently I'm having trouble to prove it has been added to the assembly.</p>
<p>Using the command</p>
<blockquote>
<p>C:\Windows\System32>%programfiles(x86)%\Microsoft
SDKs\Windows\v7.0A\Bin\gac... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,457 | bash | # Register DLL in GAC (CMD or PowerShell)
I'm trying to register a `.DLL` in the `GAC`.
Currently I'm having trouble to prove it has been added to the assembly.
Using the command
> C:\Windows\System32>%programfiles(x86)%\Microsoft
> SDKs\Windows\v7.0A\Bin\gacutil.exe -i "path\to\my\file.dll"
The prompt tells me tha... | Remember to run PowerShell as administrator or this won't work.
```
$dllpath = c:\path\yourdll.dll
[System.Reflection.Assembly]::Load("System.EnterpriseServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")
$publish = New-Object System.EnterpriseServices.Internal.Publish
... |
44838931 | How to run a local script in mongo shell - Solution load() | 6 | 2017-06-30 05:04:49 | <p>I think this is a very basic question but I'm stuck. I'm connected to remote mongo instance (mLab) via a MongoDB shell. This has been fine for one-liners, but now I want to run larger commands but often, thus the need to do it from an already connected shell. </p>
<p>How can I run my local script.js from the mongo ... | 16,698 | 5,315,266 | 2019-04-11 14:26:12 | 44,838,983 | 15 | 2017-06-30 05:09:51 | 6,550,599 | 2019-04-11 14:26:12 | https://stackoverflow.com/q/44838931 | https://stackoverflow.com/a/44838983 | <p>Execute a JavaScript file</p>
<p>You can specify a .js file to the mongo shell, and mongo will execute the JavaScript directly. Consider the following example:</p>
<pre><code>mongo localhost:27017/test myjsfile.js
</code></pre>
<p>Replace the Localhost URL with your Mlab URL </p>
<p>Or if you are in the shell Yo... | <p>Execute a JavaScript file</p> <p>You can specify a .js file to the mongo shell, and mongo will execute the JavaScript directly. Consider the following example:</p> <pre><code>mongo localhost:27017/test myjsfile.js </code></pre> <p>Replace the Localhost URL with your Mlab URL </p> <p>Or if you are in the shell Yo... | 30073, 69521 | mongodb, mongo-shell | <h1>How to run a local script in mongo shell - Solution load()</h1>
<p>I think this is a very basic question but I'm stuck. I'm connected to remote mongo instance (mLab) via a MongoDB shell. This has been fine for one-liners, but now I want to run larger commands but often, thus the need to do it from an already connec... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,458 | bash | # How to run a local script in mongo shell - Solution load()
I think this is a very basic question but I'm stuck. I'm connected to remote mongo instance (mLab) via a MongoDB shell. This has been fine for one-liners, but now I want to run larger commands but often, thus the need to do it from an already connected shell... | Execute a JavaScript file
You can specify a .js file to the mongo shell, and mongo will execute the JavaScript directly. Consider the following example:
```
mongo localhost:27017/test myjsfile.js
```
Replace the Localhost URL with your Mlab URL
Or if you are in the shell You can execute a .js file from within the m... |
44634814 | Get substring before last occurrence of a word in shell script | 6 | 2017-06-19 15:45:24 | <p>I have a string <code>/abc/xyz/def/xyz/1234/lmn/xyz/7890/uvw</code> in Linux.</p>
<p>I want to extract the substring before the last occurrence of the string <code>xyz</code> using shell script.</p>
<p>Example:</p>
<p>Input:</p>
<pre><code>/abc/xyz/def/xyz/1234/lmn/xyz/7890/uvw
</code></pre>
<p>Output:</p>
<pr... | 12,014 | 1,776,156 | 2022-07-28 11:24:43 | 44,636,600 | 15 | 2017-06-19 17:30:13 | 1,253,222 | 2022-07-28 11:24:43 | https://stackoverflow.com/q/44634814 | https://stackoverflow.com/a/44636600 | <p>How about this:</p>
<pre><code>$ x=/abc/xyz/def/xyz/1234/lmn/xyz/7890/uvw
</code></pre>
<br>
<pre><code>$ echo ${x%xyz*}
</code></pre>
<blockquote>
<pre><code>/abc/xyz/def/xyz/1234/lmn/
</code></pre>
</blockquote>
<pre><code>$ echo ${x%/xyz*}
</code></pre>
<blockquote>
<pre><code>/abc/xyz/def/xyz/1234/lmn
</code></p... | <p>How about this:</p> <pre><code>$ x=/abc/xyz/def/xyz/1234/lmn/xyz/7890/uvw </code></pre> <br> <pre><code>$ echo ${x%xyz*} </code></pre> <blockquote> <pre><code>/abc/xyz/def/xyz/1234/lmn/ </code></pre> </blockquote> <pre><code>$ echo ${x%/xyz*} </code></pre> <blockquote> <pre><code>/abc/xyz/def/xyz/1234/lmn </code></p... | 34, 58, 390 | linux, shell, unix | <h1>Get substring before last occurrence of a word in shell script</h1>
<p>I have a string <code>/abc/xyz/def/xyz/1234/lmn/xyz/7890/uvw</code> in Linux.</p>
<p>I want to extract the substring before the last occurrence of the string <code>xyz</code> using shell script.</p>
<p>Example:</p>
<p>Input:</p>
<pre><code>/... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,459 | bash | # Get substring before last occurrence of a word in shell script
I have a string `/abc/xyz/def/xyz/1234/lmn/xyz/7890/uvw` in Linux.
I want to extract the substring before the last occurrence of the string `xyz` using shell script.
Example:
Input:
```
/abc/xyz/def/xyz/1234/lmn/xyz/7890/uvw
```
Output:
```
/abc/xy... | How about this:
```
$ x=/abc/xyz/def/xyz/1234/lmn/xyz/7890/uvw
```
```
$ echo ${x%xyz*}
```
> ```
> /abc/xyz/def/xyz/1234/lmn/
> ```
```
$ echo ${x%/xyz*}
```
> ```
> /abc/xyz/def/xyz/1234/lmn
> ```
If you really don't want the `/` before the last `xyz`, then the second echo should be what you're looking for;... |
43230731 | How to remove the last line from a variable in bash or sh? | 6 | 2017-04-05 12:06:44 | <p>I have a variable that has few lines. I would like to remove the last line from the contents of the variable. I searched the internet but all the links talk about removing the last line from a file.
Here is the content of my variable</p>
<pre><code>$echo $var
$select key from table_test
UNION ALL
select fob from ta... | 13,558 | 5,658,836 | 2020-11-13 23:12:53 | 43,230,810 | 15 | 2017-04-05 12:10:34 | 2,106,703 | 2017-04-05 12:13:56 | https://stackoverflow.com/q/43230731 | https://stackoverflow.com/a/43230810 | <p><code>sed</code> can do it the same way it would do it from a file :</p>
<pre><code>> echo "$var" | sed '$d'
</code></pre>
<p>EDIT : <code>$</code> represents the last line of the file, and <code>d</code> deletes it.
See <a href="http://sed.sourceforge.net/sedfaq3.html#s3.1" rel="noreferrer">here</a> for detail... | <p><code>sed</code> can do it the same way it would do it from a file :</p> <pre><code>> echo "$var" | sed '$d' </code></pre> <p>EDIT : <code>$</code> represents the last line of the file, and <code>d</code> deletes it. See <a href="http://sed.sourceforge.net/sedfaq3.html#s3.1" rel="noreferrer">here</a> for detail... | 387, 1718 | bash, text-processing | <h1>How to remove the last line from a variable in bash or sh?</h1>
<p>I have a variable that has few lines. I would like to remove the last line from the contents of the variable. I searched the internet but all the links talk about removing the last line from a file.
Here is the content of my variable</p>
<pre><code... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,460 | bash | # How to remove the last line from a variable in bash or sh?
I have a variable that has few lines. I would like to remove the last line from the contents of the variable. I searched the internet but all the links talk about removing the last line from a file.
Here is the content of my variable
```
$echo $var
$select ... | `sed` can do it the same way it would do it from a file :
```
> echo "$var" | sed '$d'
```
EDIT : `$` represents the last line of the file, and `d` deletes it.
See [here](http://sed.sourceforge.net/sedfaq3.html#s3.1) for details |
42215604 | Powershell: split string with newline, then use -contains | 6 | 2017-02-13 23:54:29 | <pre><code>$a = {aa
bb
cc}
$a = $a -split "`n"
$a -contains "aa"
</code></pre>
<p>This returns false, when the string "aa" is seemingly part of the list. Why is this? </p>
| 23,406 | 2,069,276 | 2021-12-27 15:51:39 | 42,216,677 | 15 | 2017-02-14 02:09:01 | 45,375 | 2021-12-27 15:51:39 | https://stackoverflow.com/q/42215604 | https://stackoverflow.com/a/42216677 | <p>To complement <a href="https://stackoverflow.com/a/42216059/45375">Kory Gill's helpful answer</a>, which suggests that the <strong>problem may be that the input has CRLF (<code>"`r`n"</code>) line endings</strong>, in which case <code>-split "`n"</code> (splitting by LF only) would leave the resu... | <p>To complement <a href="https://stackoverflow.com/a/42216059/45375">Kory Gill's helpful answer</a>, which suggests that the <strong>problem may be that the input has CRLF (<code>"`r`n"</code>) line endings</strong>, in which case <code>-split "`n"</code> (splitting by LF only) would leave the resu... | 526 | powershell | <h1>Powershell: split string with newline, then use -contains</h1>
<pre><code>$a = {aa
bb
cc}
$a = $a -split "`n"
$a -contains "aa"
</code></pre>
<p>This returns false, when the string "aa" is seemingly part of the list. Why is this? </p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,461 | bash | # Powershell: split string with newline, then use -contains
```
$a = {aa
bb
cc}
$a = $a -split "`n"
$a -contains "aa"
```
This returns false, when the string "aa" is seemingly part of the list. Why is this? | To complement [Kory Gill's helpful answer](https://stackoverflow.com/a/42216059/45375), which suggests that the **problem may be that the input has CRLF (`` "`r`n" ``) line endings**, in which case `` -split "`n" `` (splitting by LF only) would leave the resulting array elements with a trailing CR (`` "`r" ``), causing... |
41994368 | How to get the modified date and year of file in Unix? | 6 | 2017-02-02 04:47:34 | <p>I am looking for a command to get the modified date of file in Unix including the year.
Currently when I am using <code>ls -lrt A.sh</code>
we get following details:
-rwxrwSrwx 1 infprdbi bis 34816 Jan 31 15:44 A.sh</p>
| 11,307 | 5,269,176 | 2017-02-02 04:53:47 | 41,994,429 | 15 | 2017-02-02 04:53:47 | 4,787,126 | 2017-02-02 04:53:47 | https://stackoverflow.com/q/41994368 | https://stackoverflow.com/a/41994429 | <p>You can specify the time format via <code>--time-style</code> option:</p>
<pre><code>ls -la --time-style=full-iso
ls -la --time-style=+%Y-%m-%d
</code></pre>
| <p>You can specify the time format via <code>--time-style</code> option:</p> <pre><code>ls -la --time-style=full-iso ls -la --time-style=+%Y-%m-%d </code></pre> | 34, 387 | bash, unix | <h1>How to get the modified date and year of file in Unix?</h1>
<p>I am looking for a command to get the modified date of file in Unix including the year.
Currently when I am using <code>ls -lrt A.sh</code>
we get following details:
-rwxrwSrwx 1 infprdbi bis 34816 Jan 31 15:44 A.sh</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,462 | bash | # How to get the modified date and year of file in Unix?
I am looking for a command to get the modified date of file in Unix including the year.
Currently when I am using `ls -lrt A.sh`
we get following details:
-rwxrwSrwx 1 infprdbi bis 34816 Jan 31 15:44 A.sh | You can specify the time format via `--time-style` option:
```
ls -la --time-style=full-iso
ls -la --time-style=+%Y-%m-%d
``` |
40503713 | Using powershell to connect to HTTPS sites | 6 | 2016-11-09 09:35:32 | <p>I have been provided a new Server 2012 box to setup. </p>
<p>I'm trying to use powershell to install chocolatey </p>
<p><code>
iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
</code></p>
<p>and getting the error</p>
<p><code>
Exception calling "DownloadString" with "1... | 7,171 | 222,163 | 2017-05-02 20:45:33 | 40,507,904 | 15 | 2016-11-09 13:14:32 | 222,163 | 2017-05-02 20:45:33 | https://stackoverflow.com/q/40503713 | https://stackoverflow.com/a/40507904 | <p>It turns out this was as a result of TLS 1.0 being disabled in our server images in order to comply with PCI DSS 3.1.</p>
<p>Rolling back that change to the image resolved the powershell issue.</p>
<p>In the short term we can run </p>
<p><code>[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolTyp... | <p>It turns out this was as a result of TLS 1.0 being disabled in our server images in order to comply with PCI DSS 3.1.</p> <p>Rolling back that change to the image resolved the powershell issue.</p> <p>In the short term we can run </p> <p><code>[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolTyp... | 526, 641, 96533 | powershell, ssl, windows-server-2012-r2 | <h1>Using powershell to connect to HTTPS sites</h1>
<p>I have been provided a new Server 2012 box to setup. </p>
<p>I'm trying to use powershell to install chocolatey </p>
<p><code>
iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
</code></p>
<p>and getting the error</p>
... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,463 | bash | # Using powershell to connect to HTTPS sites
I have been provided a new Server 2012 box to setup.
I'm trying to use powershell to install chocolatey
`iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))`
and getting the error
`Exception calling "DownloadString" with "1" argu... | It turns out this was as a result of TLS 1.0 being disabled in our server images in order to comply with PCI DSS 3.1.
Rolling back that change to the image resolved the powershell issue.
In the short term we can run
`[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12` before using `Syste... |
39999237 | zsh script parser error for nested if/else | 6 | 2016-10-12 12:58:46 | <p>I have the following humble zsh function:</p>
<pre><code>function remember()
{
if [ "$1" != "" ]
then
if[ "$1" != "clean" ]
then
echo "Why";
#echo $1 >> {~/.remember_info};
else
rm -r ~/.remember_info;
touch ~/.remember_info;
fi
else
cat .remember_info;
fi
}... | 32,699 | 6,546,677 | 2022-12-01 00:12:10 | 39,999,545 | 15 | 2016-10-12 13:14:18 | 1,126,841 | 2022-12-01 00:12:10 | https://stackoverflow.com/q/39999237 | https://stackoverflow.com/a/39999545 | <p>You forgot the space between <code>if</code> and <code>[</code> when comparing to <code>clean</code>.</p>
<p>This is case, though, where your function can be made simpler by handling the <code>=</code> case first.</p>
<pre><code>function remember()
{
if [ "$1" = "" ]; then
cat ~/.remember_i... | <p>You forgot the space between <code>if</code> and <code>[</code> when comparing to <code>clean</code>.</p> <p>This is case, though, where your function can be made simpler by handling the <code>=</code> case first.</p> <pre><code>function remember() { if [ "$1" = "" ]; then cat ~/.remember_i... | 387, 531, 3791 | bash, scripting, zsh | <h1>zsh script parser error for nested if/else</h1>
<p>I have the following humble zsh function:</p>
<pre><code>function remember()
{
if [ "$1" != "" ]
then
if[ "$1" != "clean" ]
then
echo "Why";
#echo $1 >> {~/.remember_info};
else
rm -r ~/.remember_info;
touch ~/.remembe... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,464 | bash | # zsh script parser error for nested if/else
I have the following humble zsh function:
```
function remember()
{
if [ "$1" != "" ]
then
if[ "$1" != "clean" ]
then
echo "Why";
#echo $1 >> {~/.remember_info};
else
rm -r ~/.remember_info;
touch ~/.remember_info;
fi
else
... | You forgot the space between `if` and `[` when comparing to `clean`.
This is case, though, where your function can be made simpler by handling the `=` case first.
```
function remember()
{
if [ "$1" = "" ]; then
cat ~/.remember_info
elif [ "$1" = clean ]; then
rm -r ~/.remember_info
touch ~/.remember_... |
39043429 | chmod 777 -R on existing path getting chmod: -R: No such file or directory | 6 | 2016-08-19 16:03:25 | <p>I wanted to grant operation access using <code>sudo chmod 777 -R <path></code> on mac, I double checked the given path, and it's existing and no typos, but I still got <code>chmod: -R: No such file or directory</code>. Any ideas about why I'm getting this error?</p>
| 29,518 | 3,781,320 | 2016-08-19 16:07:50 | 39,043,496 | 15 | 2016-08-19 16:07:50 | 1,047,662 | 2016-08-19 16:07:50 | https://stackoverflow.com/q/39043429 | https://stackoverflow.com/a/39043496 | <p>If you look at the synopsis from the man page for <code>chmod</code> you will se the following:</p>
<blockquote>
<p>SYNOPSIS<br>
chmod [OPTION]... MODE[,MODE]... FILE...<br>
chmod [OPTION]... OCTAL-MODE FILE...<br>
chmod [OPTION]... --reference=RFILE FILE...</p>
</blockquote>
<p>The <c... | <p>If you look at the synopsis from the man page for <code>chmod</code> you will se the following:</p> <blockquote> <p>SYNOPSIS<br> chmod [OPTION]... MODE[,MODE]... FILE...<br> chmod [OPTION]... OCTAL-MODE FILE...<br> chmod [OPTION]... --reference=RFILE FILE...</p> </blockquote> <p>The <c... | 359, 369, 387, 12380 | bash, chmod, macos, permissions | <h1>chmod 777 -R on existing path getting chmod: -R: No such file or directory</h1>
<p>I wanted to grant operation access using <code>sudo chmod 777 -R <path></code> on mac, I double checked the given path, and it's existing and no typos, but I still got <code>chmod: -R: No such file or directory</code>. Any idea... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 9,465 | bash | # chmod 777 -R on existing path getting chmod: -R: No such file or directory
I wanted to grant operation access using `sudo chmod 777 -R <path>` on mac, I double checked the given path, and it's existing and no typos, but I still got `chmod: -R: No such file or directory`. Any ideas about why I'm getting this error? | If you look at the synopsis from the man page for `chmod` you will se the following:
> SYNOPSIS
> chmod [OPTION]... MODE[,MODE]... FILE...
> chmod [OPTION]... OCTAL-MODE FILE...
> chmod [OPTION]... --reference=RFILE FILE...
The `-R` flag should be used before the actual file mode, so you need to call the comman... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.