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17583373 | Selecting attributes in xml using xpath in powershell | 24 | 2013-07-11 00:56:29 | <p>I am trying to use powershell and XPath to select the name attribute shown in the below xml example.</p>
<pre><code> $xml_peoples= $file.SelectNodes("//people")
foreach ($person in $xml_peoples){
echo $person.attributes
#echo $person.attributes.name
}
</code></pre>
<p>Above i... | 105,840 | 1,044,585 | 2017-08-22 16:43:26 | 17,583,851 | 16 | 2013-07-11 01:58:04 | 1,248,365 | 2013-07-11 01:58:04 | https://stackoverflow.com/q/17583373 | https://stackoverflow.com/a/17583851 | <p>I'm not sure what <strong>$hub</strong> is, and you started your code from the middle so it's not clear if you properly set <strong>$file</strong> to an XmlDocument object, but I think this is what you want:</p>
<pre><code>[System.Xml.XmlDocument]$file = new-object System.Xml.XmlDocument
$file.load(<path to XML ... | <p>I'm not sure what <strong>$hub</strong> is, and you started your code from the middle so it's not clear if you properly set <strong>$file</strong> to an XmlDocument object, but I think this is what you want:</p> <pre><code>[System.Xml.XmlDocument]$file = new-object System.Xml.XmlDocument $file.load(<path to XML ... | 19, 526, 531, 1227 | powershell, scripting, xml, xpath | <h1>Selecting attributes in xml using xpath in powershell</h1>
<p>I am trying to use powershell and XPath to select the name attribute shown in the below xml example.</p>
<pre><code> $xml_peoples= $file.SelectNodes("//people")
foreach ($person in $xml_peoples){
echo $person.attributes
... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,661 | bash | # Selecting attributes in xml using xpath in powershell
I am trying to use powershell and XPath to select the name attribute shown in the below xml example.
```
$xml_peoples= $file.SelectNodes("//people")
foreach ($person in $xml_peoples){
echo $person.attributes
#echo $person.attri... | I'm not sure what **$hub** is, and you started your code from the middle so it's not clear if you properly set **$file** to an XmlDocument object, but I think this is what you want:
```
[System.Xml.XmlDocument]$file = new-object System.Xml.XmlDocument
$file.load(<path to XML file>)
$xml_peoples= $file.SelectNodes("/pe... |
21475639 | Wait until service starts in bash-script | 23 | 2014-01-31 08:43:01 | <p>I've a bash-script that starts some service in background. After this service successfully starts it prints "Server is active" to the stdout. I need to wait until this string appears and then continue executing my script. How can I achieve this?</p>
| 38,070 | 1,773,534 | 2020-05-05 23:05:44 | 21,480,316 | 16 | 2014-01-31 12:39:04 | 1,190,965 | 2014-01-31 12:39:04 | https://stackoverflow.com/q/21475639 | https://stackoverflow.com/a/21480316 | <p>I would do in this way.</p>
<pre><code>./server > /tmp/server-log.txt &
sleep 1
while ! grep -m1 'Server is active' < /tmp/server-log.txt; do
sleep 1
done
echo Continue
</code></pre>
<p>Here <code>-m1</code> tells <code>grep(1)</code> to quit at the first match.</p>
<p>I veryfied my answer with my ... | <p>I would do in this way.</p> <pre><code>./server > /tmp/server-log.txt & sleep 1 while ! grep -m1 'Server is active' < /tmp/server-log.txt; do sleep 1 done echo Continue </code></pre> <p>Here <code>-m1</code> tells <code>grep(1)</code> to quit at the first match.</p> <p>I veryfied my answer with my ... | 58, 387 | bash, linux | <h1>Wait until service starts in bash-script</h1>
<p>I've a bash-script that starts some service in background. After this service successfully starts it prints "Server is active" to the stdout. I need to wait until this string appears and then continue executing my script. How can I achieve this?</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,662 | bash | # Wait until service starts in bash-script
I've a bash-script that starts some service in background. After this service successfully starts it prints "Server is active" to the stdout. I need to wait until this string appears and then continue executing my script. How can I achieve this? | I would do in this way.
```
./server > /tmp/server-log.txt &
sleep 1
while ! grep -m1 'Server is active' < /tmp/server-log.txt; do
sleep 1
done
echo Continue
```
Here `-m1` tells `grep(1)` to quit at the first match.
I veryfied my answer with my toy "service" below:
```
#! /bin/bash
trap "echo 'YOU killed me ... |
8604150 | With $TERM='screen-256color' under tmux, HOME and END keys don't work. Why? | 23 | 2011-12-22 12:54:02 | <p>I have tmux set up with <code>$TERM</code> being set to <code>screen-256color</code> correctly. This works fine, and colours are set correctly, however it prevents me from sending <code>HOME</code> and <code>END</code> keys to the terminal, which are instead printed as <code>F\n</code> and <code>H\n</code>. </p>
<p... | 6,872 | 781,909 | 2014-01-21 08:04:14 | 9,674,158 | 16 | 2012-03-12 20:17:02 | 895,931 | 2012-03-12 20:17:02 | https://stackoverflow.com/q/8604150 | https://stackoverflow.com/a/9674158 | <p>The above mapping solution doesn't affect the command mode or visual mode. The following is a more ideal solution until either tmux or vim fixes the bug (put in your <strong>.vimrc</strong>):</p>
<pre><code>""""""""""""""
" tmux fixes "
""""""""""""""
" Handle tmux $TERM quirks in vim
if $TERM =~ '^screen-256color... | <p>The above mapping solution doesn't affect the command mode or visual mode. The following is a more ideal solution until either tmux or vim fixes the bug (put in your <strong>.vimrc</strong>):</p> <pre><code>"""""""""""""" " tmux fixes " """""""""""""" " Handle tmux $TERM quirks in vim if $TERM =~ '^screen-256color... | 387, 391, 60238 | bash, terminal, tmux | <h1>With $TERM='screen-256color' under tmux, HOME and END keys don't work. Why?</h1>
<p>I have tmux set up with <code>$TERM</code> being set to <code>screen-256color</code> correctly. This works fine, and colours are set correctly, however it prevents me from sending <code>HOME</code> and <code>END</code> keys to the t... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,663 | bash | # With $TERM='screen-256color' under tmux, HOME and END keys don't work. Why?
I have tmux set up with `$TERM` being set to `screen-256color` correctly. This works fine, and colours are set correctly, however it prevents me from sending `HOME` and `END` keys to the terminal, which are instead printed as `F\n` and `H\n`... | The above mapping solution doesn't affect the command mode or visual mode. The following is a more ideal solution until either tmux or vim fixes the bug (put in your **.vimrc**):
```
""""""""""""""
" tmux fixes "
""""""""""""""
" Handle tmux $TERM quirks in vim
if $TERM =~ '^screen-256color'
map <Esc>OH <Home>
... |
20891710 | What magic prevents Tkinter programs from blocking in interactive shell? | 22 | 2014-01-02 20:56:49 | <p><em>Note: This is somewhat a follow-up on the question: <a href="https://stackoverflow.com/questions/8683217/tkinter-when-do-i-need-to-call-mainloop">Tkinter - when do I need to call mainloop?</a></em></p>
<p>Usually when using <a href="http://docs.python.org/3/library/tkinter.html" rel="noreferrer">Tkinter</a>, yo... | 4,276 | 216,074 | 2014-01-02 22:09:36 | 20,892,684 | 16 | 2014-01-02 21:57:19 | 908,494 | 2014-01-02 22:09:36 | https://stackoverflow.com/q/20891710 | https://stackoverflow.com/a/20892684 | <p>It's actually not being an interactive interpreter that matters here, but waiting for input on a TTY. You can get the same behavior from a script like this:</p>
<pre><code>import tkinter
t = tkinter.Tk()
input()
</code></pre>
<p>(On Windows, you may have to run the script in pythonw.exe instead of python.exe, but ... | <p>It's actually not being an interactive interpreter that matters here, but waiting for input on a TTY. You can get the same behavior from a script like this:</p> <pre><code>import tkinter t = tkinter.Tk() input() </code></pre> <p>(On Windows, you may have to run the script in pythonw.exe instead of python.exe, but ... | 16, 5323, 68237 | interactive-shell, python, tkinter | <h1>What magic prevents Tkinter programs from blocking in interactive shell?</h1>
<p><em>Note: This is somewhat a follow-up on the question: <a href="https://stackoverflow.com/questions/8683217/tkinter-when-do-i-need-to-call-mainloop">Tkinter - when do I need to call mainloop?</a></em></p>
<p>Usually when using <a hre... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,664 | bash | # What magic prevents Tkinter programs from blocking in interactive shell?
*Note: This is somewhat a follow-up on the question: [Tkinter - when do I need to call mainloop?](https://stackoverflow.com/questions/8683217/tkinter-when-do-i-need-to-call-mainloop)*
Usually when using [Tkinter](http://docs.python.org/3/libra... | It's actually not being an interactive interpreter that matters here, but waiting for input on a TTY. You can get the same behavior from a script like this:
```
import tkinter
t = tkinter.Tk()
input()
```
(On Windows, you may have to run the script in pythonw.exe instead of python.exe, but otherwise, you don't have t... |
19742062 | Why are "declare -f" and "declare -a" needed in bash scripts? | 22 | 2013-11-02 12:50:01 | <p>Sorry for the innocent question - I'm just trying to understand...</p>
<p>For example - I have:</p>
<pre><code>$ cat test.sh
#!/bin/bash
declare -f testfunct
testfunct () {
echo "I'm function"
}
testfunct
declare -a testarr
testarr=([1]=arr1 [2]=arr2 [3]=arr3)
echo ${testarr[@]}
</code></pre>
<p>And w... | 15,831 | 2,720,802 | 2020-12-03 20:12:41 | 19,742,317 | 16 | 2013-11-02 13:21:15 | 1,815,797 | 2013-11-02 13:26:57 | https://stackoverflow.com/q/19742062 | https://stackoverflow.com/a/19742317 | <p><code>declare -f functionname</code> is used to output the definition of the function <code>functionname</code>, if it exists, and absolutely not to <em>declare</em> that <code>functionname</code> is/will be a function. Look:</p>
<pre><code>$ unset -f a # unsetting the function a, if it existed
$ declare -f a
$ # n... | <p><code>declare -f functionname</code> is used to output the definition of the function <code>functionname</code>, if it exists, and absolutely not to <em>declare</em> that <code>functionname</code> is/will be a function. Look:</p> <pre><code>$ unset -f a # unsetting the function a, if it existed $ declare -f a $ # n... | 387, 5569, 16655 | bash, declare, function | <h1>Why are "declare -f" and "declare -a" needed in bash scripts?</h1>
<p>Sorry for the innocent question - I'm just trying to understand...</p>
<p>For example - I have:</p>
<pre><code>$ cat test.sh
#!/bin/bash
declare -f testfunct
testfunct () {
echo "I'm function"
}
testfunct
declare -a testarr
testarr=... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,665 | bash | # Why are "declare -f" and "declare -a" needed in bash scripts?
Sorry for the innocent question - I'm just trying to understand...
For example - I have:
```
$ cat test.sh
#!/bin/bash
declare -f testfunct
testfunct () {
echo "I'm function"
}
testfunct
declare -a testarr
testarr=([1]=arr1 [2]=arr2 [3]=arr3)
echo ... | `declare -f functionname` is used to output the definition of the function `functionname`, if it exists, and absolutely not to *declare* that `functionname` is/will be a function. Look:
```
$ unset -f a # unsetting the function a, if it existed
$ declare -f a
$ # nothing output and look at the exit code:
$ echo $?
1
$... |
2520085 | How do I conditionally redirect the output of a command to /dev/null? | 22 | 2010-03-25 23:11:17 | <p>I have a script. I would like to give this script a quiet mode and a verbose mode.</p>
<p>This is the equivalent of:</p>
<pre><code>if $verbose
then
redirect="> /dev/null"
fi
echo "Verbose mode enabled" $redirect # This doesn't work because the redirect isn't evaluated.
</code></pre>
<p>I'd really like a be... | 7,509 | 1,512 | 2020-09-21 17:35:20 | 2,520,269 | 16 | 2010-03-25 23:52:02 | 119,963 | 2020-09-21 17:35:20 | https://stackoverflow.com/q/2520085 | https://stackoverflow.com/a/2520269 | <p>You could write a wrapper function:</p>
<pre><code>redirect_cmd() {
# write your test however you want; this just tests if SILENT is non-empty
if [ -n "$SILENT" ]; then
"$@" > /dev/null
else
"$@"
fi
}
</code></pre>
<p>You can then use it to run any com... | <p>You could write a wrapper function:</p> <pre><code>redirect_cmd() { # write your test however you want; this just tests if SILENT is non-empty if [ -n "$SILENT" ]; then "$@" > /dev/null else "$@" fi } </code></pre> <p>You can then use it to run any com... | 387, 31901 | bash, http-redirect | <h1>How do I conditionally redirect the output of a command to /dev/null?</h1>
<p>I have a script. I would like to give this script a quiet mode and a verbose mode.</p>
<p>This is the equivalent of:</p>
<pre><code>if $verbose
then
redirect="> /dev/null"
fi
echo "Verbose mode enabled" $redirect # This doesn't wo... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,666 | bash | # How do I conditionally redirect the output of a command to /dev/null?
I have a script. I would like to give this script a quiet mode and a verbose mode.
This is the equivalent of:
```
if $verbose
then
redirect="> /dev/null"
fi
echo "Verbose mode enabled" $redirect # This doesn't work because the redirect isn't ... | You could write a wrapper function:
```
redirect_cmd() {
# write your test however you want; this just tests if SILENT is non-empty
if [ -n "$SILENT" ]; then
"$@" > /dev/null
else
"$@"
fi
}
```
You can then use it to run any command with the redirect:
```
redirect_cmd echo "unsilenced... |
56962129 | How to get original location of script used for SLURM job? | 21 | 2019-07-10 00:55:05 | <p>I'm starting the SLURM job with script and script must work depending on it's location which is obtained inside of script itself with <code>SCRIPT_LOCATION=$(realpath $0)</code>. But SLURM copies script to <code>slurmd</code> folder and starts job from there and it screws up further actions.</p>
<p>Are there any op... | 9,437 | 7,447,867 | 2024-02-19 14:01:28 | 56,991,068 | 16 | 2019-07-11 14:03:27 | 1,763,614 | 2023-09-07 06:51:46 | https://stackoverflow.com/q/56962129 | https://stackoverflow.com/a/56991068 | <p>You can get the initial (i.e. at submit time) location of the submission script from <code>scontrol</code> like this:</p>
<pre><code>scontrol show job "$SLURM_JOB_ID" | awk -F= '/Command=/{print $2}'
</code></pre>
<p>So you can replace the <code>realpath $0</code> part with the above. This will only work w... | <p>You can get the initial (i.e. at submit time) location of the submission script from <code>scontrol</code> like this:</p> <pre><code>scontrol show job "$SLURM_JOB_ID" | awk -F= '/Command=/{print $2}' </code></pre> <p>So you can replace the <code>realpath $0</code> part with the above. This will only work w... | 276, 387, 6268, 97759 | bash, path, slurm, variables | <h1>How to get original location of script used for SLURM job?</h1>
<p>I'm starting the SLURM job with script and script must work depending on it's location which is obtained inside of script itself with <code>SCRIPT_LOCATION=$(realpath $0)</code>. But SLURM copies script to <code>slurmd</code> folder and starts job f... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,667 | bash | # How to get original location of script used for SLURM job?
I'm starting the SLURM job with script and script must work depending on it's location which is obtained inside of script itself with `SCRIPT_LOCATION=$(realpath $0)`. But SLURM copies script to `slurmd` folder and starts job from there and it screws up furt... | You can get the initial (i.e. at submit time) location of the submission script from `scontrol` like this:
```
scontrol show job "$SLURM_JOB_ID" | awk -F= '/Command=/{print $2}'
```
So you can replace the `realpath $0` part with the above. This will only work within a Slurm allocation of course. So if you want the sc... |
36858588 | Exit a PowerShell function but continue the script | 21 | 2016-04-26 07:50:24 | <p>This might seem like a very very stupid question, but I can't really figure it out. I'm trying to have the function stop when it finds its first hit (match) and then continue with the rest of the script.</p>
<p><strong>Code:</strong></p>
<pre><code>Function Get-Foo {
[CmdLetBinding()]
Param ()
1..6 | ... | 60,162 | 2,304,170 | 2021-11-25 20:49:26 | 36,858,941 | 16 | 2016-04-26 08:07:19 | 978,511 | 2016-04-26 08:07:19 | https://stackoverflow.com/q/36858588 | https://stackoverflow.com/a/36858941 | <p>As was mentioned, <code>Foreach-object</code> is a function of its own. Use regular <code>foreach</code></p>
<pre><code>Function Get-Foo {
[CmdLetBinding()]
Param ()
$a = 1..6
foreach($b in $a)
{
Write-Verbose $b
if ($b -eq 3) {
Write-Output 'We found it'
break
}
elseif ($b -eq 5) ... | <p>As was mentioned, <code>Foreach-object</code> is a function of its own. Use regular <code>foreach</code></p> <pre><code>Function Get-Foo { [CmdLetBinding()] Param () $a = 1..6 foreach($b in $a) { Write-Verbose $b if ($b -eq 3) { Write-Output 'We found it' break } elseif ($b -eq 5) ... | 526, 5569, 10871 | exit, function, powershell | <h1>Exit a PowerShell function but continue the script</h1>
<p>This might seem like a very very stupid question, but I can't really figure it out. I'm trying to have the function stop when it finds its first hit (match) and then continue with the rest of the script.</p>
<p><strong>Code:</strong></p>
<pre><code>Functi... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,668 | bash | # Exit a PowerShell function but continue the script
This might seem like a very very stupid question, but I can't really figure it out. I'm trying to have the function stop when it finds its first hit (match) and then continue with the rest of the script.
**Code:**
```
Function Get-Foo {
[CmdLetBinding()]
P... | As was mentioned, `Foreach-object` is a function of its own. Use regular `foreach`
```
Function Get-Foo {
[CmdLetBinding()]
Param ()
$a = 1..6
foreach($b in $a)
{
Write-Verbose $b
if ($b -eq 3) {
Write-Output 'We found it'
break
}
elseif ($b -eq 5) {
Write-Output 'We found it'... |
1860344 | Use UFormat to get unix time | 21 | 2009-12-07 14:34:50 | <p>I can use following to append a date to a text:</p>
<pre><code>"Foo {0:G} Foo" -f (date) #returns "Foo 2009-12-07 15:34:16 Foo"
</code></pre>
<p>But I want the time in Unix format.
I can get it by <code>date -UFormat %s</code>, but can I use the same syntax?</p>
<p>When I use <code>-UFormat %s</code> I get <e... | 46,342 | 198,145 | 2026-01-17 01:46:30 | 1,860,511 | 16 | 2009-12-07 15:02:37 | 153,982 | 2009-12-09 02:21:03 | https://stackoverflow.com/q/1860344 | https://stackoverflow.com/a/1860511 | <p>Just cast the result to an int like so:</p>
<pre><code>PS> [int][double]::Parse((Get-Date -UFormat %s))
1260172909
PS> "Foo {0:G} Foo" -f [int][double]::Parse((Get-Date -UFormat %s))
Foo 1260172997 Foo
</code></pre>
<p>Using the Parse method means the string is parsed "culture aware" such that the appropria... | <p>Just cast the result to an int like so:</p> <pre><code>PS> [int][double]::Parse((Get-Date -UFormat %s)) 1260172909 PS> "Foo {0:G} Foo" -f [int][double]::Parse((Get-Date -UFormat %s)) Foo 1260172997 Foo </code></pre> <p>Using the Parse method means the string is parsed "culture aware" such that the appropria... | 526 | powershell | <h1>Use UFormat to get unix time</h1>
<p>I can use following to append a date to a text:</p>
<pre><code>"Foo {0:G} Foo" -f (date) #returns "Foo 2009-12-07 15:34:16 Foo"
</code></pre>
<p>But I want the time in Unix format.
I can get it by <code>date -UFormat %s</code>, but can I use the same syntax?</p>
<p>When I... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,669 | bash | # Use UFormat to get unix time
I can use following to append a date to a text:
```
"Foo {0:G} Foo" -f (date) #returns "Foo 2009-12-07 15:34:16 Foo"
```
But I want the time in Unix format.
I can get it by `date -UFormat %s`, but can I use the same syntax?
When I use `-UFormat %s` I get *1260199855,65625*, how do... | Just cast the result to an int like so:
```
PS> [int][double]::Parse((Get-Date -UFormat %s))
1260172909
PS> "Foo {0:G} Foo" -f [int][double]::Parse((Get-Date -UFormat %s))
Foo 1260172997 Foo
```
Using the Parse method means the string is parsed "culture aware" such that the appropriate decimal separator character is... |
10002356 | What does "set keymap vi" do? | 20 | 2012-04-03 22:27:47 | <p>I wanted vim-like navigation for my terminal, so I added:</p>
<pre><code>set editing-mode vi
set keymap vi
</code></pre>
<p>To my <code>.inputrc</code> file based on <a href="http://vim.wikia.com/wiki/Use_vi_shortcuts_in_terminal">this</a>. <code>editing-mode vi</code> adds vi navigation. What does <code>keymap vi... | 32,043 | 139,117 | 2016-08-17 06:31:19 | 38,989,262 | 16 | 2016-08-17 06:13:06 | 5,353,461 | 2016-08-17 06:31:19 | https://stackoverflow.com/q/10002356 | https://stackoverflow.com/a/38989262 | <p><strong>TL;DR</strong></p>
<p>If you don't want to change/add bindings in the default keymaps, you don't need the line <code>keymap vi</code>.</p>
<p>What <code>keymap vi</code> does is state that any bindings listed after that point apply to that keymap (which is <em>exactly</em> the same keymap as <code>vi-command... | <p><strong>TL;DR</strong></p> <p>If you don't want to change/add bindings in the default keymaps, you don't need the line <code>keymap vi</code>.</p> <p>What <code>keymap vi</code> does is state that any bindings listed after that point apply to that keymap (which is <em>exactly</em> the same keymap as <code>vi-command... | 387, 390 | bash, shell | <h1>What does "set keymap vi" do?</h1>
<p>I wanted vim-like navigation for my terminal, so I added:</p>
<pre><code>set editing-mode vi
set keymap vi
</code></pre>
<p>To my <code>.inputrc</code> file based on <a href="http://vim.wikia.com/wiki/Use_vi_shortcuts_in_terminal">this</a>. <code>editing-mode vi</code> adds v... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,670 | bash | # What does "set keymap vi" do?
I wanted vim-like navigation for my terminal, so I added:
```
set editing-mode vi
set keymap vi
```
To my `.inputrc` file based on [this](http://vim.wikia.com/wiki/Use_vi_shortcuts_in_terminal). `editing-mode vi` adds vi navigation. What does `keymap vi` do, and why do I need it? | **TL;DR**
If you don't want to change/add bindings in the default keymaps, you don't need the line `keymap vi`.
What `keymap vi` does is state that any bindings listed after that point apply to that keymap (which is *exactly* the same keymap as `vi-command` and `vi-move`).
If you want to change the insertion keymap ... |
8061475 | Split one file into multiple files based on pattern | 20 | 2011-11-09 07:05:50 | <p>I have a binary file which I convert into a regular file using hexdump and few awk and sed commands. The output file looks something like this - </p>
<pre><code>$cat temp
3d3d01f87347545002f1d5b2be4ee4d700010100018000cc57e5820000000000000000000
000000087d3f513000000000000000000000000000000000001001001010f0000000000... | 40,821 | 970,195 | 2019-06-05 23:05:08 | 8,061,558 | 16 | 2011-11-09 07:18:26 | 77,567 | 2011-11-09 07:18:26 | https://stackoverflow.com/q/8061475 | https://stackoverflow.com/a/8061558 | <pre><code>#!/usr/bin/perl
undef $/;
$_ = <>;
$n = 0;
for $match (split(/(?=3d3d)/)) {
open(O, '>temp' . ++$n);
print O $match;
close(O);
}
</code></pre>
| <pre><code>#!/usr/bin/perl undef $/; $_ = <>; $n = 0; for $match (split(/(?=3d3d)/)) { open(O, '>temp' . ++$n); print O $match; close(O); } </code></pre> | 387, 990, 2193, 5282 | awk, bash, sed, split | <h1>Split one file into multiple files based on pattern</h1>
<p>I have a binary file which I convert into a regular file using hexdump and few awk and sed commands. The output file looks something like this - </p>
<pre><code>$cat temp
3d3d01f87347545002f1d5b2be4ee4d700010100018000cc57e5820000000000000000000
000000087d... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,671 | bash | # Split one file into multiple files based on pattern
I have a binary file which I convert into a regular file using hexdump and few awk and sed commands. The output file looks something like this -
```
$cat temp
3d3d01f87347545002f1d5b2be4ee4d700010100018000cc57e5820000000000000000000
000000087d3f5130000000000000000... | ```
#!/usr/bin/perl
undef $/;
$_ = <>;
$n = 0;
for $match (split(/(?=3d3d)/)) {
open(O, '>temp' . ++$n);
print O $match;
close(O);
}
``` |
2552402 | cat file | ... vs ... <file | 20 | 2010-03-31 11:21:56 | <p>Is there a case of <code>...</code> or context where <code>cat file | ...</code> behaves differently than <code>... <file</code>?</p>
| 4,661 | 34,596 | 2018-01-18 15:11:50 | 2,552,464 | 16 | 2010-03-31 11:30:47 | 12,274 | 2010-03-31 15:35:44 | https://stackoverflow.com/q/2552402 | https://stackoverflow.com/a/2552464 | <p>When reading from a regular file, <code>cat</code> is in charge of reading the data, performs it as it pleases, and might constrain it in the way it writes it to the pipeline. Obviously, the contents themselves are preserved, but anything else could be tainted. For example: block size and data arrival timing. Add... | <p>When reading from a regular file, <code>cat</code> is in charge of reading the data, performs it as it pleases, and might constrain it in the way it writes it to the pipeline. Obviously, the contents themselves are preserved, but anything else could be tainted. For example: block size and data arrival timing. Add... | 34, 205, 390, 5813 | pipe, puzzle, shell, unix | <h1>cat file | ... vs ... <file</h1>
<p>Is there a case of <code>...</code> or context where <code>cat file | ...</code> behaves differently than <code>... <file</code>?</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,672 | bash | # cat file | ... vs ... Is there a case of `...` or context where `cat file | ...` behaves differently than `... <file`? | When reading from a regular file, `cat` is in charge of reading the data, performs it as it pleases, and might constrain it in the way it writes it to the pipeline. Obviously, the contents themselves are preserved, but anything else could be tainted. For example: block size and data arrival timing. Additionally, the pi... |
1330136 | Script to recursively delete CVS directory on server | 20 | 2009-08-25 18:32:25 | <p>So far I've come up with this:</p>
<pre><code>find . -name 'CVS' -type d -exec rm -rf {} \;
</code></pre>
<p>It's worked locally thus far, can anyone see any potential issues? I want this to basically recursively delete 'CVS' directories accidently uploaded on to a server. </p>
<p>Also, how can I make it a script... | 11,720 | 145,190 | 2015-04-29 08:06:06 | 1,330,210 | 16 | 2009-08-25 18:46:22 | 27,727 | 2015-04-29 08:06:06 | https://stackoverflow.com/q/1330136 | https://stackoverflow.com/a/1330210 | <p>Well, the obvious caveat: It'll delete directories named CVS, regardless of if they're CVS directories or not.</p>
<p>You can turn it into a script fairly easily:</p>
<pre><code>#!/bin/sh
if [ -z "$1" ]; then
echo "Usage: $0 path"
exit 1
fi
find "$1" -name 'CVS' -type d -print0 | xargs -0 rm -Rf
# or fin... | <p>Well, the obvious caveat: It'll delete directories named CVS, regardless of if they're CVS directories or not.</p> <p>You can turn it into a script fairly easily:</p> <pre><code>#!/bin/sh if [ -z "$1" ]; then echo "Usage: $0 path" exit 1 fi find "$1" -name 'CVS' -type d -print0 | xargs -0 rm -Rf # or fin... | 34, 387 | bash, unix | <h1>Script to recursively delete CVS directory on server</h1>
<p>So far I've come up with this:</p>
<pre><code>find . -name 'CVS' -type d -exec rm -rf {} \;
</code></pre>
<p>It's worked locally thus far, can anyone see any potential issues? I want this to basically recursively delete 'CVS' directories accidently uplo... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,673 | bash | # Script to recursively delete CVS directory on server
So far I've come up with this:
```
find . -name 'CVS' -type d -exec rm -rf {} \;
```
It's worked locally thus far, can anyone see any potential issues? I want this to basically recursively delete 'CVS' directories accidently uploaded on to a server.
Also, how c... | Well, the obvious caveat: It'll delete directories named CVS, regardless of if they're CVS directories or not.
You can turn it into a script fairly easily:
```
#!/bin/sh
if [ -z "$1" ]; then
echo "Usage: $0 path"
exit 1
fi
find "$1" -name 'CVS' -type d -print0 | xargs -0 rm -Rf
# or find … -exec like you ha... |
251851 | Using PowerShell to add an extension to files | 20 | 2008-10-30 21:30:23 | <p>I have a directory of files that I'd like to append file extension to as long as they don't have an existing, specified extension. So add .txt to all file names that don't end in .xyz. PowerShell seems like a good candidate for this, but I don't know anything about it. How would I go about it?</p>
| 48,557 | 1,786 | 2015-05-16 21:37:38 | 251,886 | 16 | 2008-10-30 21:48:32 | 615 | 2008-10-30 21:48:32 | https://stackoverflow.com/q/251851 | https://stackoverflow.com/a/251886 | <p>+1 to EBGreen, except that (at least on XP) the "-exclude" parameter to get-childitem doesn't seem to work. The help text (gci -?) actually says "this parameter does not work properly in this cmdlet"!</p>
<p>So you can filter manually like this:</p>
<pre><code>gci
| ?{ !$_.PSIsContainer -and !$_.Name.EndsWith("... | <p>+1 to EBGreen, except that (at least on XP) the "-exclude" parameter to get-childitem doesn't seem to work. The help text (gci -?) actually says "this parameter does not work properly in this cmdlet"!</p> <p>So you can filter manually like this:</p> <pre><code>gci | ?{ !$_.PSIsContainer -and !$_.Name.EndsWith("... | 526 | powershell | <h1>Using PowerShell to add an extension to files</h1>
<p>I have a directory of files that I'd like to append file extension to as long as they don't have an existing, specified extension. So add .txt to all file names that don't end in .xyz. PowerShell seems like a good candidate for this, but I don't know anything ab... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,674 | bash | # Using PowerShell to add an extension to files
I have a directory of files that I'd like to append file extension to as long as they don't have an existing, specified extension. So add .txt to all file names that don't end in .xyz. PowerShell seems like a good candidate for this, but I don't know anything about it. H... | +1 to EBGreen, except that (at least on XP) the "-exclude" parameter to get-childitem doesn't seem to work. The help text (gci -?) actually says "this parameter does not work properly in this cmdlet"!
So you can filter manually like this:
```
gci
| ?{ !$_.PSIsContainer -and !$_.Name.EndsWith(".xyz") }
| %{ ren ... |
53771022 | How to create and install X.509 self signed certificates in Windows 10 without user interaction? | 19 | 2018-12-13 22:33:52 | <h2>The problem</h2>
<ul>
<li><strong>Create and install</strong> temporary certificates to sign
code in my development environment.</li>
<li>This has to be done with an <strong>unattended</strong>
script (without user interaction).</li>
</ul>
<h2>The legacy script</h2>
<p>Right now, I have this script that creates the... | 19,655 | 623,913 | 2018-12-22 16:44:01 | 53,869,276 | 16 | 2018-12-20 13:01:52 | 2,678,467 | 2018-12-22 09:56:23 | https://stackoverflow.com/q/53771022 | https://stackoverflow.com/a/53869276 | <p>I just tested your code with the signtool.exe coming from my Visual Studio 2017 installation and things seems to work.</p>
<p>So I would really like to see the code / command you use for signing the files. Even more I would like to see the real output from the error that you are seeing. Could you try your signing p... | <p>I just tested your code with the signtool.exe coming from my Visual Studio 2017 installation and things seems to work.</p> <p>So I would really like to see the code / command you use for signing the files. Even more I would like to see the real output from the error that you are seeing. Could you try your signing p... | 526, 24008, 30841, 42181, 107329 | powershell, unattended-processing, windows-10, x509, x509certificate | <h1>How to create and install X.509 self signed certificates in Windows 10 without user interaction?</h1>
<h2>The problem</h2>
<ul>
<li><strong>Create and install</strong> temporary certificates to sign
code in my development environment.</li>
<li>This has to be done with an <strong>unattended</strong>
script (without ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,675 | bash | # How to create and install X.509 self signed certificates in Windows 10 without user interaction?
## The problem
- **Create and install** temporary certificates to sign
code in my development environment.
- This has to be done with an **unattended**
script (without user interaction).
## The legacy script
Right... | I just tested your code with the signtool.exe coming from my Visual Studio 2017 installation and things seems to work.
So I would really like to see the code / command you use for signing the files. Even more I would like to see the real output from the error that you are seeing. Could you try your signing process man... |
43626779 | Get-AzureStorageBlob : Could not get the storage context. Please pass in a storage context or set the current storage context | 19 | 2017-04-26 06:40:17 | <p>I am using powershell with Azure cmdlets to try and simply see items in blob storage</p>
<pre><code> $StorageContext = New-AzureStorageContext -StorageAccountName 'myblobname' -StorageAccountKey '2341231234asdff2352354345=='
$Container = Get-AzureStorageContainer -Name 'mycontainer' -Context $StorageContext
... | 33,578 | 1,514,111 | 2017-04-26 06:44:50 | 43,626,846 | 16 | 2017-04-26 06:44:50 | 188,096 | 2017-04-26 06:44:50 | https://stackoverflow.com/q/43626779 | https://stackoverflow.com/a/43626846 | <p>You would need to include <code>StorageContext</code> here as well:</p>
<pre><code>$blobs = Get-AzureStorageBlob -Container $Container
</code></pre>
<p>So your code would be:</p>
<pre><code>$blobs = Get-AzureStorageBlob -Container $Container -Context $StorageContext
</code></pre>
| <p>You would need to include <code>StorageContext</code> here as well:</p> <pre><code>$blobs = Get-AzureStorageBlob -Container $Container </code></pre> <p>So your code would be:</p> <pre><code>$blobs = Get-AzureStorageBlob -Container $Container -Context $StorageContext </code></pre> | 526, 3883, 14158, 114615 | azure, azure-blob-storage, blob, powershell | <h1>Get-AzureStorageBlob : Could not get the storage context. Please pass in a storage context or set the current storage context</h1>
<p>I am using powershell with Azure cmdlets to try and simply see items in blob storage</p>
<pre><code> $StorageContext = New-AzureStorageContext -StorageAccountName 'myblobname' -Sto... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,676 | bash | # Get-AzureStorageBlob : Could not get the storage context. Please pass in a storage context or set the current storage context
I am using powershell with Azure cmdlets to try and simply see items in blob storage
```
$StorageContext = New-AzureStorageContext -StorageAccountName 'myblobname' -StorageAccountKey '2341... | You would need to include `StorageContext` here as well:
```
$blobs = Get-AzureStorageBlob -Container $Container
```
So your code would be:
```
$blobs = Get-AzureStorageBlob -Container $Container -Context $StorageContext
``` |
20176640 | Syntax error: operand expected (error token is "+") | 19 | 2013-11-24 16:03:06 | <p>I'm writing a script in bash and I get this error:</p>
<pre><code>./P4.1: line 10: +: syntax error: operand expected (error token is "+")
</code></pre>
<p>And this is my code:</p>
<pre><code>#!/bin/bash
read string
echo $string >| temp
num1= cut -d" " -f1 temp
num2= cut -d" " -f2 temp
num3= cut -d" " -f3 temp
... | 158,066 | 2,513,747 | 2025-07-21 23:13:45 | 20,176,956 | 16 | 2013-11-24 16:32:52 | 2,180,567 | 2013-11-24 16:32:52 | https://stackoverflow.com/q/20176640 | https://stackoverflow.com/a/20176956 | <p>Combination of ceving and Tomek's:</p>
<pre><code>#!/bin/bash
read num1 num2 num3
while [ $num1 -lt $num3 ]
do
echo $num1
num1=$((num1+num2))
done
</code></pre>
| <p>Combination of ceving and Tomek's:</p> <pre><code>#!/bin/bash read num1 num2 num3 while [ $num1 -lt $num3 ] do echo $num1 num1=$((num1+num2)) done </code></pre> | 34, 387 | bash, unix | <h1>Syntax error: operand expected (error token is "+")</h1>
<p>I'm writing a script in bash and I get this error:</p>
<pre><code>./P4.1: line 10: +: syntax error: operand expected (error token is "+")
</code></pre>
<p>And this is my code:</p>
<pre><code>#!/bin/bash
read string
echo $string >| temp
num1= cut -d" ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,677 | bash | # Syntax error: operand expected (error token is "+")
I'm writing a script in bash and I get this error:
```
./P4.1: line 10: +: syntax error: operand expected (error token is "+")
```
And this is my code:
```
#!/bin/bash
read string
echo $string >| temp
num1= cut -d" " -f1 temp
num2= cut -d" " -f2 temp
num3= cut -... | Combination of ceving and Tomek's:
```
#!/bin/bash
read num1 num2 num3
while [ $num1 -lt $num3 ]
do
echo $num1
num1=$((num1+num2))
done
``` |
18890926 | How to get the Java version in PowerShell | 19 | 2013-09-19 09:25:34 | <p>I'm trying to get the Java version in PowerShell. The version string is printed to <strong>stderr</strong>, so I'm trying to redirect it to stdout and assign it to a string variable.</p>
<p>I get the following strange error:</p>
<pre><code>PS P:\> & java -version 2>&1
java.exe : java version "1.7.0_2... | 85,985 | 902,415 | 2018-07-24 01:08:02 | 18,891,102 | 16 | 2013-09-19 09:32:50 | 520,612 | 2014-12-01 00:19:52 | https://stackoverflow.com/q/18890926 | https://stackoverflow.com/a/18891102 | <p>One way is using <a href="http://en.wikipedia.org/wiki/Windows_Management_Instrumentation" rel="noreferrer">WMI</a>:</p>
<pre><code>$javaver = Get-WmiObject -Class Win32_Product -Filter "Name like 'Java(TM)%'" | Select -Expand Version
</code></pre>
<p>Another one is redirect to a file with start-process:</p>
<pr... | <p>One way is using <a href="http://en.wikipedia.org/wiki/Windows_Management_Instrumentation" rel="noreferrer">WMI</a>:</p> <pre><code>$javaver = Get-WmiObject -Class Win32_Product -Filter "Name like 'Java(TM)%'" | Select -Expand Version </code></pre> <p>Another one is redirect to a file with start-process:</p> <pr... | 17, 526, 5792 | java, powershell, version | <h1>How to get the Java version in PowerShell</h1>
<p>I'm trying to get the Java version in PowerShell. The version string is printed to <strong>stderr</strong>, so I'm trying to redirect it to stdout and assign it to a string variable.</p>
<p>I get the following strange error:</p>
<pre><code>PS P:\> & java -v... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,678 | bash | # How to get the Java version in PowerShell
I'm trying to get the Java version in PowerShell. The version string is printed to **stderr**, so I'm trying to redirect it to stdout and assign it to a string variable.
I get the following strange error:
```
PS P:\> & java -version 2>&1
java.exe : java version "1.7.0_25"
... | One way is using [WMI](http://en.wikipedia.org/wiki/Windows_Management_Instrumentation):
```
$javaver = Get-WmiObject -Class Win32_Product -Filter "Name like 'Java(TM)%'" | Select -Expand Version
```
Another one is redirect to a file with start-process:
```
start-process java -ArgumentList "-version" -NoNewWindow... |
7271945 | logrotate compress files after the postrotate script | 19 | 2011-09-01 14:39:45 | <p>I have an application generating a really heavy big log file every days (~800MB a day), thus I need to compress them but since the compression takes time, I want that logrotate compress the file after reloading/sending HUP signal to the application.</p>
<pre><code>/var/log/myapp.log {
rotate 7
size 500M
... | 49,184 | 311,288 | 2025-05-09 09:58:12 | 7,272,035 | 16 | 2011-09-01 14:46:02 | 20,270 | 2011-09-01 14:46:02 | https://stackoverflow.com/q/7271945 | https://stackoverflow.com/a/7272035 | <p>The <code>postrotate</code> script does run before compression occurs: from the man page for <a href="http://linuxcommand.org/man_pages/logrotate8.html">logrotate</a></p>
<blockquote>
<p>The next section of the config files defined how to handle the log file
/var/log/messages. The log will go through fiv... | <p>The <code>postrotate</code> script does run before compression occurs: from the man page for <a href="http://linuxcommand.org/man_pages/logrotate8.html">logrotate</a></p> <blockquote> <p>The next section of the config files defined how to handle the log file /var/log/messages. The log will go through fiv... | 58, 76, 390, 942, 5877 | compression, linux, logging, logrotate, shell | <h1>logrotate compress files after the postrotate script</h1>
<p>I have an application generating a really heavy big log file every days (~800MB a day), thus I need to compress them but since the compression takes time, I want that logrotate compress the file after reloading/sending HUP signal to the application.</p>
... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,679 | bash | # logrotate compress files after the postrotate script
I have an application generating a really heavy big log file every days (~800MB a day), thus I need to compress them but since the compression takes time, I want that logrotate compress the file after reloading/sending HUP signal to the application.
```
/var/log/... | The `postrotate` script does run before compression occurs: from the man page for [logrotate](http://linuxcommand.org/man_pages/logrotate8.html)
> The next section of the config files defined how to handle the log file
> /var/log/messages. The log will go through five weekly rotations before
> being removed. After the... |
6628066 | Default values for the arguments to a Unix shell script? | 19 | 2011-07-08 17:22:31 | <p>Normally when a parameter is passed to a shell script, the value goes into ${1} for the first parameter, ${2} for the second, etc.</p>
<p>How can I set the default values for these parameters, so that if no parameter is passed to the script, we can use a default value for ${1}?</p>
| 13,123 | 835,380 | 2022-05-10 21:56:12 | 6,628,093 | 16 | 2011-07-08 17:25:33 | 742,469 | 2011-07-08 17:25:33 | https://stackoverflow.com/q/6628066 | https://stackoverflow.com/a/6628093 | <p>You can't, but you can assign to a local variable like this: <code>${parameter:-word}</code> or use the same construct in the place you need $1. this menas use <em>word</em> if _paramater is null or unset</p>
<p>Note, this works in <em>bash</em>, check your shell for the syntax of <em>default values</em></p>
| <p>You can't, but you can assign to a local variable like this: <code>${parameter:-word}</code> or use the same construct in the place you need $1. this menas use <em>word</em> if _paramater is null or unset</p> <p>Note, this works in <em>bash</em>, check your shell for the syntax of <em>default values</em></p> | 34, 58, 390, 531 | linux, scripting, shell, unix | <h1>Default values for the arguments to a Unix shell script?</h1>
<p>Normally when a parameter is passed to a shell script, the value goes into ${1} for the first parameter, ${2} for the second, etc.</p>
<p>How can I set the default values for these parameters, so that if no parameter is passed to the script, we can us... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,680 | bash | # Default values for the arguments to a Unix shell script?
Normally when a parameter is passed to a shell script, the value goes into ${1} for the first parameter, ${2} for the second, etc.
How can I set the default values for these parameters, so that if no parameter is passed to the script, we can use a default val... | You can't, but you can assign to a local variable like this: `${parameter:-word}` or use the same construct in the place you need $1. this menas use *word* if _paramater is null or unset
Note, this works in *bash*, check your shell for the syntax of *default values* |
4432549 | What's the difference between the `USER` and `USERNAME` environment variables? | 19 | 2010-12-13 19:10:35 | <p>I'm not entirely sure which one to use.</p>
| 12,229 | 139,089 | 2020-07-27 06:44:34 | 4,432,617 | 16 | 2010-12-13 19:21:03 | 369,789 | 2020-07-27 06:44:34 | https://stackoverflow.com/q/4432549 | https://stackoverflow.com/a/4432617 | <ul>
<li><p><strong>On windows:</strong> <code>ENV['username']</code> will output the current username.</p>
</li>
<li><p><strong>On linux:</strong> If the script is run through <code>sudo</code>, <code>"USER"</code> will be the <code>sudo</code>-ed-to user (usually <code>root</code>) and "USERNAME" ... | <ul> <li><p><strong>On windows:</strong> <code>ENV['username']</code> will output the current username.</p> </li> <li><p><strong>On linux:</strong> If the script is run through <code>sudo</code>, <code>"USER"</code> will be the <code>sudo</code>-ed-to user (usually <code>root</code>) and "USERNAME" ... | 390, 9013 | environment-variables, shell | <h1>What's the difference between the `USER` and `USERNAME` environment variables?</h1>
<p>I'm not entirely sure which one to use.</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,681 | bash | # What's the difference between the `USER` and `USERNAME` environment variables?
I'm not entirely sure which one to use. | - **On windows:** `ENV['username']` will output the current username.
- **On linux:** If the script is run through `sudo`, `"USER"` will be the `sudo`-ed-to user (usually `root`) and "USERNAME" will be the user who ran sudo.
- **On Mac :** only USER exists (on MacOS 10.15. To be confirmed on previous versions)
Here's ... |
750449 | Converting xml from UTF-16 to UTF-8 using PowerShell | 19 | 2009-04-15 05:45:07 | <p>What's the easiest way to convert XML from UTF16 to a UTF8 encoded file?</p>
| 27,287 | 25,702 | 2012-10-21 11:41:39 | 750,453 | 16 | 2009-04-15 05:49:54 | 2,918 | 2012-06-08 05:12:05 | https://stackoverflow.com/q/750449 | https://stackoverflow.com/a/750453 | <p>This may not be the most optimal, but it works. Simply load the xml and push it back out to a file. the xml heading is lost though, so this has to be re-added.</p>
<pre><code>$files = get-ChildItem "*.xml"
foreach ( $file in $files )
{
[System.Xml.XmlDocument]$doc = new-object System.Xml.XmlDocument;
$doc.... | <p>This may not be the most optimal, but it works. Simply load the xml and push it back out to a file. the xml heading is lost though, so this has to be re-added.</p> <pre><code>$files = get-ChildItem "*.xml" foreach ( $file in $files ) { [System.Xml.XmlDocument]$doc = new-object System.Xml.XmlDocument; $doc.... | 19, 526, 8944, 10016 | powershell, utf-16, utf-8, xml | <h1>Converting xml from UTF-16 to UTF-8 using PowerShell</h1>
<p>What's the easiest way to convert XML from UTF16 to a UTF8 encoded file?</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,682 | bash | # Converting xml from UTF-16 to UTF-8 using PowerShell
What's the easiest way to convert XML from UTF16 to a UTF8 encoded file? | This may not be the most optimal, but it works. Simply load the xml and push it back out to a file. the xml heading is lost though, so this has to be re-added.
```
$files = get-ChildItem "*.xml"
foreach ( $file in $files )
{
[System.Xml.XmlDocument]$doc = new-object System.Xml.XmlDocument;
$doc.set_PreserveWhi... |
15062 | How do I do a string replacement in a PowerShell function? | 19 | 2008-08-18 18:40:34 | <p>How do I convert function input parameters to the right type?</p>
<p>I want to return a string that has part of the URL passed into it removed.</p>
<p><strong>This works, but it uses a hard-coded string:</strong></p>
<pre><code>function CleanUrl($input)
{
$x = "http://google.com".Replace("http://", "")
re... | 54,760 | 636 | 2015-07-13 13:17:04 | 15,136 | 16 | 2008-08-18 19:50:39 | 1,233 | 2015-07-13 13:17:04 | https://stackoverflow.com/q/15062 | https://stackoverflow.com/a/15136 | <p>The concept here is correct.</p>
<p>The problem is with the variable name you have chosen. $input is a reserved variable used by PowerShell to represent an array of pipeline input. If you change your variable name, you should not have any problem.</p>
<p>PowerShell does have <a href="https://technet.microsoft.com/... | <p>The concept here is correct.</p> <p>The problem is with the variable name you have chosen. $input is a reserved variable used by PowerShell to represent an array of pipeline input. If you change your variable name, you should not have any problem.</p> <p>PowerShell does have <a href="https://technet.microsoft.com/... | 139, 526, 2498, 5569 | function, powershell, replace, string | <h1>How do I do a string replacement in a PowerShell function?</h1>
<p>How do I convert function input parameters to the right type?</p>
<p>I want to return a string that has part of the URL passed into it removed.</p>
<p><strong>This works, but it uses a hard-coded string:</strong></p>
<pre><code>function CleanUrl(... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,683 | bash | # How do I do a string replacement in a PowerShell function?
How do I convert function input parameters to the right type?
I want to return a string that has part of the URL passed into it removed.
**This works, but it uses a hard-coded string:**
```
function CleanUrl($input)
{
$x = "http://google.com".Replace(... | The concept here is correct.
The problem is with the variable name you have chosen. $input is a reserved variable used by PowerShell to represent an array of pipeline input. If you change your variable name, you should not have any problem.
PowerShell does have [a replace operator](https://technet.microsoft.com/en-us... |
40547032 | bash read returns with exit code 1 even though it runs as expected | 18 | 2016-11-11 11:28:04 | <p>I have this construct to initialize a variable with the contents of a file:</p>
<pre><code>echo "yyy" > xxx
read -r -d '' PAYLOAD <<< $(cat xxx)
echo $?
echo $PAYLOAD
</code></pre>
<p>This results in:</p>
<pre><code>1
yyy
</code></pre>
<p>Why is read returning 1? This is breaking my script, because I... | 8,307 | 647,991 | 2023-08-06 23:49:39 | 40,547,123 | 16 | 2016-11-11 11:33:15 | 548,225 | 2016-11-11 11:33:15 | https://stackoverflow.com/q/40547032 | https://stackoverflow.com/a/40547123 | <p><code>read</code> is returning 1 because it returns <code>0</code> only when end-of-file is not encountered.</p>
<p>As per <code>help read</code>:</p>
<pre><code>Exit Status:
The return code is zero, unless end-of-file is encountered
</code></pre>
<p>You don't even need a <code>read</code> here, just use <code>$(... | <p><code>read</code> is returning 1 because it returns <code>0</code> only when end-of-file is not encountered.</p> <p>As per <code>help read</code>:</p> <pre><code>Exit Status: The return code is zero, unless end-of-file is encountered </code></pre> <p>You don't even need a <code>read</code> here, just use <code>$(... | 58, 387 | bash, linux | <h1>bash read returns with exit code 1 even though it runs as expected</h1>
<p>I have this construct to initialize a variable with the contents of a file:</p>
<pre><code>echo "yyy" > xxx
read -r -d '' PAYLOAD <<< $(cat xxx)
echo $?
echo $PAYLOAD
</code></pre>
<p>This results in:</p>
<pre><code>1
yyy
</co... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,684 | bash | # bash read returns with exit code 1 even though it runs as expected
I have this construct to initialize a variable with the contents of a file:
```
echo "yyy" > xxx
read -r -d '' PAYLOAD <<< $(cat xxx)
echo $?
echo $PAYLOAD
```
This results in:
```
1
yyy
```
Why is read returning 1? This is breaking my script, be... | `read` is returning 1 because it returns `0` only when end-of-file is not encountered.
As per `help read`:
```
Exit Status:
The return code is zero, unless end-of-file is encountered
```
You don't even need a `read` here, just use `$(<file)` to read the file content into a variable:
```
echo "yyy" > xxx
payload=$(<... |
37328327 | Apply regex on JQ | 18 | 2016-05-19 15:51:37 | <p>I´m using jq to get a json and get some values.</p>
<p>I have this string </p>
<pre><code> "arn:aws:ecs:eu-west-1:foo:task/blablabla"
</code></pre>
<p>And I want to get the substring from task/ and then return just blablabla</p>
<p>For now I have this regex.</p>
<pre><code> (.*task?)\/(.*$)
</code></pre>
<p>... | 16,259 | 854,207 | 2016-05-19 20:47:28 | 37,329,187 | 16 | 2016-05-19 16:33:30 | null | 2016-05-19 16:33:30 | https://stackoverflow.com/q/37328327 | https://stackoverflow.com/a/37329187 | <p>On jq 1.5, you can pass the regex to <code>match</code> and then get the <code>string</code> property of <code>captures</code>' second element.</p>
<pre><code>jq 'match("(.*task?)\/(.*$)").captures[1].string'
</code></pre>
| <p>On jq 1.5, you can pass the regex to <code>match</code> and then get the <code>string</code> property of <code>captures</code>' second element.</p> <pre><code>jq 'match("(.*task?)\/(.*$)").captures[1].string' </code></pre> | 18, 387, 105170 | bash, jq, regex | <h1>Apply regex on JQ</h1>
<p>I´m using jq to get a json and get some values.</p>
<p>I have this string </p>
<pre><code> "arn:aws:ecs:eu-west-1:foo:task/blablabla"
</code></pre>
<p>And I want to get the substring from task/ and then return just blablabla</p>
<p>For now I have this regex.</p>
<pre><code> (.*task?... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,685 | bash | # Apply regex on JQ
I´m using jq to get a json and get some values.
I have this string
```
"arn:aws:ecs:eu-west-1:foo:task/blablabla"
```
And I want to get the substring from task/ and then return just blablabla
For now I have this regex.
```
(.*task?)\/(.*$)
```
Which give me two groups.
Any idea how using... | On jq 1.5, you can pass the regex to `match` and then get the `string` property of `captures`' second element.
```
jq 'match("(.*task?)\/(.*$)").captures[1].string'
``` |
30146466 | Command substitution with string substitution | 18 | 2015-05-10 00:32:25 | <p>Is it possible to do something along the lines of:</p>
<pre><code>echo ${$(ls)/foo/bar}
</code></pre>
<p>I'm pretty sure i saw somewhere working example of something like that but this results in "bad substitution" error.</p>
<p>I know that there are other methods to do that but such a short oneliner would be use... | 9,222 | 3,665,534 | 2019-09-11 10:53:25 | 30,147,156 | 16 | 2015-05-10 02:40:09 | 45,375 | 2015-05-10 02:45:23 | https://stackoverflow.com/q/30146466 | https://stackoverflow.com/a/30147156 | <p><strong>Syntax <code>${...}</code></strong> only allows <strong>referencing a <em>variable</em> (or positional parameter), optionally combined with <a href="http://wiki.bash-hackers.org/syntax/pe" rel="noreferrer">parameter expansion</a></strong>.</p>
<p><strong>Syntax <code>$(...)</code></strong> (or, less prefera... | <p><strong>Syntax <code>${...}</code></strong> only allows <strong>referencing a <em>variable</em> (or positional parameter), optionally combined with <a href="http://wiki.bash-hackers.org/syntax/pe" rel="noreferrer">parameter expansion</a></strong>.</p> <p><strong>Syntax <code>$(...)</code></strong> (or, less prefera... | 387, 77246 | bash, command-substitution | <h1>Command substitution with string substitution</h1>
<p>Is it possible to do something along the lines of:</p>
<pre><code>echo ${$(ls)/foo/bar}
</code></pre>
<p>I'm pretty sure i saw somewhere working example of something like that but this results in "bad substitution" error.</p>
<p>I know that there are other me... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,686 | bash | # Command substitution with string substitution
Is it possible to do something along the lines of:
```
echo ${$(ls)/foo/bar}
```
I'm pretty sure i saw somewhere working example of something like that but this results in "bad substitution" error.
I know that there are other methods to do that but such a short onelin... | **Syntax `${...}`** only allows **referencing a *variable* (or positional parameter), optionally combined with [parameter expansion](http://wiki.bash-hackers.org/syntax/pe)**.
**Syntax `$(...)`** (or, less preferably, its old-style equivalent, `` `...` ``), performs **[command substitution](http://mywiki.wooledge.org/... |
12282842 | How to login to website with basic authentication using Powershell | 18 | 2012-09-05 13:41:24 | <p>I am trying to use PowerShell to log into a website and download a file.</p>
<p>However I can't get PS to pass the credentials properly.</p>
<p>Here is my PS:</p>
<pre><code>$webclient = new-object System.Net.WebClient
$webclient.Credentials = new-object System.Net.NetworkCredential("username","password","domain"... | 72,625 | 55,718 | 2021-01-26 20:44:14 | 12,284,255 | 16 | 2012-09-05 14:56:16 | 55,718 | 2012-09-05 14:56:16 | https://stackoverflow.com/q/12282842 | https://stackoverflow.com/a/12284255 | <p>This is what I got to work. I believe the key part is the "Basic" in the CredentialCache</p>
<pre><code>$webclient = new-object System.Net.WebClient
$credCache = new-object System.Net.CredentialCache
$creds = new-object System.Net.NetworkCredential("un","pw")
$credCache.Add("url", "Basic", $creds)
$webclient.Crede... | <p>This is what I got to work. I believe the key part is the "Basic" in the CredentialCache</p> <pre><code>$webclient = new-object System.Net.WebClient $credCache = new-object System.Net.CredentialCache $creds = new-object System.Net.NetworkCredential("un","pw") $credCache.Add("url", "Basic", $creds) $webclient.Crede... | 526 | powershell | <h1>How to login to website with basic authentication using Powershell</h1>
<p>I am trying to use PowerShell to log into a website and download a file.</p>
<p>However I can't get PS to pass the credentials properly.</p>
<p>Here is my PS:</p>
<pre><code>$webclient = new-object System.Net.WebClient
$webclient.Credenti... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,687 | bash | # How to login to website with basic authentication using Powershell
I am trying to use PowerShell to log into a website and download a file.
However I can't get PS to pass the credentials properly.
Here is my PS:
```
$webclient = new-object System.Net.WebClient
$webclient.Credentials = new-object System.Net.Networ... | This is what I got to work. I believe the key part is the "Basic" in the CredentialCache
```
$webclient = new-object System.Net.WebClient
$credCache = new-object System.Net.CredentialCache
$creds = new-object System.Net.NetworkCredential("un","pw")
$credCache.Add("url", "Basic", $creds)
$webclient.Credentials = $credC... |
12176492 | shell: delete the last line of a huge text log file | 18 | 2012-08-29 11:04:40 | <p>I asked a <a href="https://stackoverflow.com/questions/12175344/php-pop-the-last-line-of-huge-text-log-file">question</a> regarding popping the last line of a text file in PHP, and now, is it possible to re-write the logic in shell script?</p>
<p>I tried this to obtain the last line:</p>
<pre><code>tail -n 1 my_lo... | 22,964 | 188,331 | 2012-08-29 15:51:46 | 12,176,634 | 16 | 2012-08-29 11:13:42 | 115,845 | 2012-08-29 15:51:46 | https://stackoverflow.com/q/12176492 | https://stackoverflow.com/a/12176634 | <p><em>(Solution is based on <a href="https://stackoverflow.com/questions/12176492/shell-delete-the-last-line-of-a-huge-text-log-file/12177339#12177339">sch's answer</a> so credit should go to him/her)</em></p>
<p>This approach will allow you to efficiently retrieve the last line of the file and truncate the file to r... | <p><em>(Solution is based on <a href="https://stackoverflow.com/questions/12176492/shell-delete-the-last-line-of-a-huge-text-log-file/12177339#12177339">sch's answer</a> so credit should go to him/her)</em></p> <p>This approach will allow you to efficiently retrieve the last line of the file and truncate the file to r... | 390, 7896 | shell, tail | <h1>shell: delete the last line of a huge text log file</h1>
<p>I asked a <a href="https://stackoverflow.com/questions/12175344/php-pop-the-last-line-of-huge-text-log-file">question</a> regarding popping the last line of a text file in PHP, and now, is it possible to re-write the logic in shell script?</p>
<p>I tried ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,688 | bash | # shell: delete the last line of a huge text log file
I asked a [question](https://stackoverflow.com/questions/12175344/php-pop-the-last-line-of-huge-text-log-file) regarding popping the last line of a text file in PHP, and now, is it possible to re-write the logic in shell script?
I tried this to obtain the last lin... | *(Solution is based on [sch's answer](https://stackoverflow.com/questions/12176492/shell-delete-the-last-line-of-a-huge-text-log-file/12177339#12177339) so credit should go to him/her)*
This approach will allow you to efficiently retrieve the last line of the file and truncate the file to remove that line. This can be... |
11035905 | Display current time with time zone in PowerShell | 18 | 2012-06-14 15:00:05 | <p>I'm trying to display the local time on my system with the TimeZone. How can I display time in this format the simplest way possible on any system?:</p>
<p>Time: 8:00:34 AM EST</p>
<p>I'm currently using the following script:</p>
<pre><code>$localtz = [System.TimeZoneInfo]::Local | Select-Object -expandproperty I... | 106,408 | 544,864 | 2023-03-21 07:00:40 | 11,040,329 | 16 | 2012-06-14 19:48:46 | 430,067 | 2012-06-14 19:58:22 | https://stackoverflow.com/q/11035905 | https://stackoverflow.com/a/11040329 | <p>While this is a bit ... naive perhaps, it's one way to get <em>an</em> abbreviation without a switch statement:</p>
<pre><code>[Regex]::Replace([System.TimeZoneInfo]::Local.StandardName, '([A-Z])\w+\s*', '$1')
</code></pre>
<p>My regular expression probably leaves something to be desired.</p>
<p>The output of the... | <p>While this is a bit ... naive perhaps, it's one way to get <em>an</em> abbreviation without a switch statement:</p> <pre><code>[Regex]::Replace([System.TimeZoneInfo]::Local.StandardName, '([A-Z])\w+\s*', '$1') </code></pre> <p>My regular expression probably leaves something to be desired.</p> <p>The output of the... | 526, 603, 982 | powershell, time, timezone | <h1>Display current time with time zone in PowerShell</h1>
<p>I'm trying to display the local time on my system with the TimeZone. How can I display time in this format the simplest way possible on any system?:</p>
<p>Time: 8:00:34 AM EST</p>
<p>I'm currently using the following script:</p>
<pre><code>$localtz = [Sy... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,689 | bash | # Display current time with time zone in PowerShell
I'm trying to display the local time on my system with the TimeZone. How can I display time in this format the simplest way possible on any system?:
Time: 8:00:34 AM EST
I'm currently using the following script:
```
$localtz = [System.TimeZoneInfo]::Local | Select... | While this is a bit ... naive perhaps, it's one way to get *an* abbreviation without a switch statement:
```
[Regex]::Replace([System.TimeZoneInfo]::Local.StandardName, '([A-Z])\w+\s*', '$1')
```
My regular expression probably leaves something to be desired.
The output of the above for my time zone is `EST`. I did s... |
7897549 | make ignores my python bash alias | 18 | 2011-10-26 00:47:05 | <p>My CentOS 5.5 server has both Python 2.4 and Python 2.7 installed (to <code>/opt/python2.7.2</code>). In my <code>~/.bash_profile</code> I have two aliases pointing to my Python 2.7 install and my <code>PATH</code> configured as:</p>
<pre>
alias python=/opt/python2.7.2/bin/python
alias python2.7=/opt/python2.7.2/bi... | 14,554 | 419 | 2017-01-17 14:28:17 | 7,897,614 | 16 | 2011-10-26 00:59:40 | 377,270 | 2011-10-26 00:59:40 | https://stackoverflow.com/q/7897549 | https://stackoverflow.com/a/7897614 | <p>From <code>bash(1)</code>:</p>
<pre><code> Aliases are not expanded when the shell is not interactive,
unless the expand_aliases shell option is set using shopt
(see the description of shopt under SHELL BUILTIN COMMANDS
below).
</code></pre>
<p>While you might be able to use something like <code>SHELL=/... | <p>From <code>bash(1)</code>:</p> <pre><code> Aliases are not expanded when the shell is not interactive, unless the expand_aliases shell option is set using shopt (see the description of shopt under SHELL BUILTIN COMMANDS below). </code></pre> <p>While you might be able to use something like <code>SHELL=/... | 387, 4301 | bash, makefile | <h1>make ignores my python bash alias</h1>
<p>My CentOS 5.5 server has both Python 2.4 and Python 2.7 installed (to <code>/opt/python2.7.2</code>). In my <code>~/.bash_profile</code> I have two aliases pointing to my Python 2.7 install and my <code>PATH</code> configured as:</p>
<pre>
alias python=/opt/python2.7.2/bin... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,690 | bash | # make ignores my python bash alias
My CentOS 5.5 server has both Python 2.4 and Python 2.7 installed (to `/opt/python2.7.2`). In my `~/.bash_profile` I have two aliases pointing to my Python 2.7 install and my `PATH` configured as:
```
alias python=/opt/python2.7.2/bin/python
alias python2.7=/opt/python2.7.2/bin/pyt... | From `bash(1)`:
```
Aliases are not expanded when the shell is not interactive,
unless the expand_aliases shell option is set using shopt
(see the description of shopt under SHELL BUILTIN COMMANDS
below).
```
While you might be able to use something like `SHELL=/bin/bash -O expand_aliases` in your `Makefi... |
7069482 | Get a list of running VMs using VBoxManage | 18 | 2011-08-15 19:11:11 | <p>I want to loop through my running VM's and return only what is between quotes.</p>
<p>So this command:</p>
<pre><code>VBoxManage list runningvms
</code></pre>
<p>returns:</p>
<pre><code>"UbuntuServer" {7ef01f8d-a7d5-4405-af42-94d85f999dff}
</code></pre>
<p>And I only want it to return:</p>
<pre><code>UbuntuSer... | 27,098 | 442,580 | 2024-09-29 21:25:27 | 7,069,536 | 16 | 2011-08-15 19:14:43 | 635,608 | 2018-01-17 19:23:17 | https://stackoverflow.com/q/7069482 | https://stackoverflow.com/a/7069536 | <p>Warning: all of this is is risky if your VM names have shell glob characters in them, or contain spaces.</p>
<hr>
<p>You can do something like this if there is only one running VM:</p>
<pre><code>read machine stuff <<< $(VBoxManage list runningvms)
echo "$machine"
</code></pre>
<p>Alternative with bash ... | <p>Warning: all of this is is risky if your VM names have shell glob characters in them, or contain spaces.</p> <hr> <p>You can do something like this if there is only one running VM:</p> <pre><code>read machine stuff <<< $(VBoxManage list runningvms) echo "$machine" </code></pre> <p>Alternative with bash ... | 387, 2447 | bash, virtualbox | <h1>Get a list of running VMs using VBoxManage</h1>
<p>I want to loop through my running VM's and return only what is between quotes.</p>
<p>So this command:</p>
<pre><code>VBoxManage list runningvms
</code></pre>
<p>returns:</p>
<pre><code>"UbuntuServer" {7ef01f8d-a7d5-4405-af42-94d85f999dff}
</code></pre>
<p>And... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,691 | bash | # Get a list of running VMs using VBoxManage
I want to loop through my running VM's and return only what is between quotes.
So this command:
```
VBoxManage list runningvms
```
returns:
```
"UbuntuServer" {7ef01f8d-a7d5-4405-af42-94d85f999dff}
```
And I only want it to return:
```
UbuntuServer
```
This is what i... | Warning: all of this is is risky if your VM names have shell glob characters in them, or contain spaces.
---
You can do something like this if there is only one running VM:
```
read machine stuff <<< $(VBoxManage list runningvms)
echo "$machine"
```
Alternative with bash arrays (same condition):
```
vbm=($(VBoxMan... |
4909944 | How to escape single quotes while setting aliases | 18 | 2011-02-05 21:55:31 | <p>I want to create an alias of this command:</p>
<pre class="lang-none prettyprint-override"><code>find . -name '*.sh' -exec chmod a+x '{}' \;
</code></pre>
<p>And I am not able to escape the single quotes while setting the alias:</p>
<pre class="lang-none prettyprint-override"><code>alias mx='find . -name '*.sh' -exe... | 7,510 | 547,417 | 2023-08-19 21:33:25 | 4,909,957 | 16 | 2011-02-05 21:58:26 | 553,707 | 2023-08-19 21:20:50 | https://stackoverflow.com/q/4909944 | https://stackoverflow.com/a/4909957 | <p>You could just use double quotes:</p>
<pre><code>alias mx="find . -name '*.sh' -exec chmod a+x {} \;"
</code></pre>
<p>Also, the single quotes <code>'</code> around the <code>{}</code> are not necessary.</p>
| <p>You could just use double quotes:</p> <pre><code>alias mx="find . -name '*.sh' -exec chmod a+x {} \;" </code></pre> <p>Also, the single quotes <code>'</code> around the <code>{}</code> are not necessary.</p> | 387 | bash | <h1>How to escape single quotes while setting aliases</h1>
<p>I want to create an alias of this command:</p>
<pre class="lang-none prettyprint-override"><code>find . -name '*.sh' -exec chmod a+x '{}' \;
</code></pre>
<p>And I am not able to escape the single quotes while setting the alias:</p>
<pre class="lang-none pre... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,692 | bash | # How to escape single quotes while setting aliases
I want to create an alias of this command:
```
find . -name '*.sh' -exec chmod a+x '{}' \;
```
And I am not able to escape the single quotes while setting the alias:
```
alias mx='find . -name '*.sh' -exec chmod a+x '{}' \;'
``` | You could just use double quotes:
```
alias mx="find . -name '*.sh' -exec chmod a+x {} \;"
```
Also, the single quotes `'` around the `{}` are not necessary. |
4307770 | Regular Expressions for file name matching | 18 | 2010-11-29 20:25:59 | <p>In Bash, how does one match a regular expression with multiple criteria against a file name?
For example, I'd like to match against all the files with .txt or .log endings.</p>
<p>I know how to match one type of criteria:</p>
<pre><code>for file in *.log
do
echo "${file}"
done
</code></pre>
<p>What's the ... | 54,153 | 385,897 | 2010-11-30 06:12:15 | 4,307,812 | 16 | 2010-11-29 20:30:10 | 68,587 | 2010-11-29 20:30:10 | https://stackoverflow.com/q/4307770 | https://stackoverflow.com/a/4307812 | <p>Do it the same way you'd invoke <code>ls</code>. You can specify multiple wildcards one after the other:</p>
<pre><code>for file in *.log *.txt
</code></pre>
| <p>Do it the same way you'd invoke <code>ls</code>. You can specify multiple wildcards one after the other:</p> <pre><code>for file in *.log *.txt </code></pre> | 18, 387 | bash, regex | <h1>Regular Expressions for file name matching</h1>
<p>In Bash, how does one match a regular expression with multiple criteria against a file name?
For example, I'd like to match against all the files with .txt or .log endings.</p>
<p>I know how to match one type of criteria:</p>
<pre><code>for file in *.log
do
... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,693 | bash | # Regular Expressions for file name matching
In Bash, how does one match a regular expression with multiple criteria against a file name?
For example, I'd like to match against all the files with .txt or .log endings.
I know how to match one type of criteria:
```
for file in *.log
do
echo "${file}"
done
```
... | Do it the same way you'd invoke `ls`. You can specify multiple wildcards one after the other:
```
for file in *.log *.txt
``` |
2722996 | Is there a gentle way of stopping processes using Windows PowerShell? | 18 | 2010-04-27 16:24:58 | <p>I have to stop a browser from a PowerShell script, which I do by piping it into</p>
<pre><code>Stop-Process -Force
</code></pre>
<p>However, this is very abrupt. When the browser is restarted, it detects that it didn't shut down cleanly, and tries to restart the previous session. Is there some way I can tell it to... | 8,749 | 11,677 | 2015-11-06 20:20:41 | 2,723,188 | 16 | 2010-04-27 16:50:23 | 153,982 | 2010-04-27 16:50:23 | https://stackoverflow.com/q/2722996 | https://stackoverflow.com/a/2723188 | <p>Try this to simulate the user closing the app:</p>
<pre><code>(Get-Process -Id 10024).CloseMainWindow()
</code></pre>
| <p>Try this to simulate the user closing the app:</p> <pre><code>(Get-Process -Id 10024).CloseMainWindow() </code></pre> | 526 | powershell | <h1>Is there a gentle way of stopping processes using Windows PowerShell?</h1>
<p>I have to stop a browser from a PowerShell script, which I do by piping it into</p>
<pre><code>Stop-Process -Force
</code></pre>
<p>However, this is very abrupt. When the browser is restarted, it detects that it didn't shut down cleanly... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,694 | bash | # Is there a gentle way of stopping processes using Windows PowerShell?
I have to stop a browser from a PowerShell script, which I do by piping it into
```
Stop-Process -Force
```
However, this is very abrupt. When the browser is restarted, it detects that it didn't shut down cleanly, and tries to restart the previo... | Try this to simulate the user closing the app:
```
(Get-Process -Id 10024).CloseMainWindow()
``` |
1344519 | How do I add a PowerShell cmdlet or function to my machine so that it is always available? | 18 | 2009-08-28 01:03:03 | <p>If I find (or create) a new PowerShell cmdlet (or function), how do I add it to my machine?</p>
<ul>
<li>Do I copy it to a particular folder?</li>
<li>Do I put its content in a particular file?</li>
<li>Do I need to authorize it, or sign it, or give it permission in some way?</li>
</ul>
<p>I don't want to use it i... | 26,216 | 49 | 2014-11-30 22:46:09 | 1,344,771 | 16 | 2009-08-28 02:41:41 | 153,982 | 2009-08-28 16:50:14 | https://stackoverflow.com/q/1344519 | https://stackoverflow.com/a/1344771 | <p>As Alex mentions, any function defined in your profile or in a script that gets "dotted" into your profile will always be available. The same goes if you use Add-PSSnapin in your profile to add a snapin. The cmdlets in the snapin will always be available. For more information about profiles check out the help top... | <p>As Alex mentions, any function defined in your profile or in a script that gets "dotted" into your profile will always be available. The same goes if you use Add-PSSnapin in your profile to add a snapin. The cmdlets in the snapin will always be available. For more information about profiles check out the help top... | 403, 526, 153947 | powershell, powershell-cmdlet, profile | <h1>How do I add a PowerShell cmdlet or function to my machine so that it is always available?</h1>
<p>If I find (or create) a new PowerShell cmdlet (or function), how do I add it to my machine?</p>
<ul>
<li>Do I copy it to a particular folder?</li>
<li>Do I put its content in a particular file?</li>
<li>Do I need to ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,695 | bash | # How do I add a PowerShell cmdlet or function to my machine so that it is always available?
If I find (or create) a new PowerShell cmdlet (or function), how do I add it to my machine?
- Do I copy it to a particular folder?
- Do I put its content in a particular file?
- Do I need to authorize it, or sign it, or give ... | As Alex mentions, any function defined in your profile or in a script that gets "dotted" into your profile will always be available. The same goes if you use Add-PSSnapin in your profile to add a snapin. The cmdlets in the snapin will always be available. For more information about profiles check out the help topic:
`... |
65662031 | Firebase app distribution via Fastlane "the server responded with status 403" | 17 | 2021-01-11 06:03:05 | <p>I setup Firebase app distribution feature in Fastlane Fastfile to distribute beta version of my iOS app. It was working fine but It suddenly started showing errors.</p>
<p>This is how my lane looks like.</p>
<pre><code>lane :distribute_beta do |options|
sync_code_signing_adhoc()
update_build... | 15,435 | 5,886,270 | 2023-11-07 14:16:06 | 65,693,239 | 16 | 2021-01-12 22:51:22 | 1,403,997 | 2021-01-12 22:51:22 | https://stackoverflow.com/q/65662031 | https://stackoverflow.com/a/65693239 | <p>Usually, when you get <em>that</em> specific message it means that the Firebase Refresh Token is no longer valid.</p>
<p>So, when you submit the app, at some point, you have to specify the Firebase Refresh Token:</p>
<pre><code>...
firebase_app_distrubution(
...
firebase_cli_token: "<YourFirebaseRefreshT... | <p>Usually, when you get <em>that</em> specific message it means that the Firebase Refresh Token is no longer valid.</p> <p>So, when you submit the app, at some point, you have to specify the Firebase Refresh Token:</p> <pre><code>... firebase_app_distrubution( ... firebase_cli_token: "<YourFirebaseRefreshT... | 387, 113585, 140355 | bash, fastlane, firebase-app-distribution | <h1>Firebase app distribution via Fastlane "the server responded with status 403"</h1>
<p>I setup Firebase app distribution feature in Fastlane Fastfile to distribute beta version of my iOS app. It was working fine but It suddenly started showing errors.</p>
<p>This is how my lane looks like.</p>
<pre><code>lane :distr... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,696 | bash | # Firebase app distribution via Fastlane "the server responded with status 403"
I setup Firebase app distribution feature in Fastlane Fastfile to distribute beta version of my iOS app. It was working fine but It suddenly started showing errors.
This is how my lane looks like.
```
lane :distribute_beta do |options|
... | Usually, when you get *that* specific message it means that the Firebase Refresh Token is no longer valid.
So, when you submit the app, at some point, you have to specify the Firebase Refresh Token:
```
...
firebase_app_distrubution(
...
firebase_cli_token: "<YourFirebaseRefreshToken>"
)
...
```
You can get this... |
53867043 | What are the limits to JShell? | 17 | 2018-12-20 10:41:46 | <p>I found <a href="https://stackoverflow.com/q/48063408/262852">this</a> question, and this <a href="https://stackoverflow.com/q/48896013/262852">other</a>, so intriguing that it begs several questions, at least for me: </p>
<p>Rather open-ended question, but where is <code>jshell</code> <em>confined</em> to? Obvio... | 2,409 | 262,852 | 2019-01-02 13:52:38 | 53,868,224 | 16 | 2018-12-20 11:55:58 | 15,472 | 2018-12-20 12:09:31 | https://stackoverflow.com/q/53867043 | https://stackoverflow.com/a/53868224 | <p><strong>Answering the updated question</strong></p>
<p>All problems can be solved with snippets (and with a sufficiently complicated shell script, too). But JShell is best used to debug and learn java - a full-fledged program is much more flexible for all other use-cases.</p>
<p><strong>JShell, .jsh and <code>java... | <p><strong>Answering the updated question</strong></p> <p>All problems can be solved with snippets (and with a sufficiently complicated shell script, too). But JShell is best used to debug and learn java - a full-fledged program is much more flexible for all other use-cases.</p> <p><strong>JShell, .jsh and <code>java... | 17, 531, 2149, 4658, 116030 | java, jshell, jvm, scripting, system-administration | <h1>What are the limits to JShell?</h1>
<p>I found <a href="https://stackoverflow.com/q/48063408/262852">this</a> question, and this <a href="https://stackoverflow.com/q/48896013/262852">other</a>, so intriguing that it begs several questions, at least for me: </p>
<p>Rather open-ended question, but where is <code>js... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,697 | bash | # What are the limits to JShell?
I found [this](https://stackoverflow.com/q/48063408/262852) question, and this [other](https://stackoverflow.com/q/48896013/262852), so intriguing that it begs several questions, at least for me:
Rather open-ended question, but where is `jshell` *confined* to? Obviously, GUI apps aren... | **Answering the updated question**
All problems can be solved with snippets (and with a sufficiently complicated shell script, too). But JShell is best used to debug and learn java - a full-fledged program is much more flexible for all other use-cases.
**JShell, .jsh and `java MyClass.java`**
[JShell](https://docs.o... |
53585993 | How can I check if Bash POSIX Mode is enabled? | 17 | 2018-12-03 00:29:27 | <p><a href="https://www.gnu.org/software/bash/manual/bash.html#Bash-POSIX-Mode" rel="noreferrer">Bash Reference Manual</a>:</p>
<blockquote>
<p>Starting Bash with the --posix command-line option or executing ‘set -o posix’ while Bash is running will cause Bash to conform more closely to the POSIX standard by changin... | 3,430 | 9,350,434 | 2018-12-21 10:40:07 | 53,586,013 | 16 | 2018-12-03 00:31:44 | 14,122 | 2018-12-03 00:31:44 | https://stackoverflow.com/q/53585993 | https://stackoverflow.com/a/53586013 | <p>For interactive use,</p>
<pre><code>set -o | grep posix
</code></pre>
<p>...will emit something like:</p>
<pre><code>posix off
</code></pre>
<p>For programmatic use, just enable or disable it (with <code>set -o posix</code> or <code>set +o posix</code> respectively) as suits your needs; there's little ... | <p>For interactive use,</p> <pre><code>set -o | grep posix </code></pre> <p>...will emit something like:</p> <pre><code>posix off </code></pre> <p>For programmatic use, just enable or disable it (with <code>set -o posix</code> or <code>set +o posix</code> respectively) as suits your needs; there's little ... | 387 | bash | <h1>How can I check if Bash POSIX Mode is enabled?</h1>
<p><a href="https://www.gnu.org/software/bash/manual/bash.html#Bash-POSIX-Mode" rel="noreferrer">Bash Reference Manual</a>:</p>
<blockquote>
<p>Starting Bash with the --posix command-line option or executing ‘set -o posix’ while Bash is running will cause Bash ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,698 | bash | # How can I check if Bash POSIX Mode is enabled?
[Bash Reference Manual](https://www.gnu.org/software/bash/manual/bash.html#Bash-POSIX-Mode):
> Starting Bash with the --posix command-line option or executing ‘set -o posix’ while Bash is running will cause Bash to conform more closely to the POSIX standard by changing... | For interactive use,
```
set -o | grep posix
```
...will emit something like:
```
posix off
```
For programmatic use, just enable or disable it (with `set -o posix` or `set +o posix` respectively) as suits your needs; there's little reason to ever check the prior value. That said, if you **really** want t... |
43662591 | wget using --timeout and --tries together | 17 | 2017-04-27 15:57:25 | <p>How long would you expect this command to take before exiting?</p>
<p><code>wget --timeout=1 --tries=2 "http://www.google.com:81/not-there"</code></p>
<p>I would expect a timeout of 1 seconds and 2 tries would mean 2 seconds, but it takes 6.025 seconds</p>
<pre><code>wget --timeout=1 --tries=2 "http://www.google.... | 39,851 | 1,196,369 | 2021-04-30 15:04:58 | 43,664,731 | 16 | 2017-04-27 17:50:29 | 6,770,384 | 2021-04-30 15:04:58 | https://stackoverflow.com/q/43662591 | https://stackoverflow.com/a/43664731 | <h1>Wrong Number of Retries</h1>
<p>Your wget seems to resolve the URL to multiple IP addresses as seen in the second line of your <code>wget</code>'s output. Each IP is then tested with the specified timeout. Unfortunately I haven't found any options to limit the DNS lookup to one address or set a total timeout for al... | <h1>Wrong Number of Retries</h1> <p>Your wget seems to resolve the URL to multiple IP addresses as seen in the second line of your <code>wget</code>'s output. Each IP is then tested with the specified timeout. Unfortunately I haven't found any options to limit the DNS lookup to one address or set a total timeout for al... | 58, 387, 5583 | bash, linux, wget | <h1>wget using --timeout and --tries together</h1>
<p>How long would you expect this command to take before exiting?</p>
<p><code>wget --timeout=1 --tries=2 "http://www.google.com:81/not-there"</code></p>
<p>I would expect a timeout of 1 seconds and 2 tries would mean 2 seconds, but it takes 6.025 seconds</p>
<pre><... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,699 | bash | # wget using --timeout and --tries together
How long would you expect this command to take before exiting?
`wget --timeout=1 --tries=2 "http://www.google.com:81/not-there"`
I would expect a timeout of 1 seconds and 2 tries would mean 2 seconds, but it takes 6.025 seconds
```
wget --timeout=1 --tries=2 "http://www.g... | # Wrong Number of Retries
Your wget seems to resolve the URL to multiple IP addresses as seen in the second line of your `wget`'s output. Each IP is then tested with the specified timeout. Unfortunately I haven't found any options to limit the DNS lookup to one address or set a total timeout for all IPs together. But ... |
37772712 | zsh: how to make tab completion need no space to next word after cursor? | 17 | 2016-06-12 09:31:37 | <p>There is an annoying difference between <code>zsh</code> and <code>bash</code> tab completion:</p>
<p>Imagine you write some command and want to add something at the beginning of the line:</p>
<pre><code>$ compute --some --stuff
</code></pre>
<p>then you jump to the beginning of the line and line and start to wri... | 2,892 | 1,668,622 | 2016-06-12 09:39:43 | 37,772,771 | 16 | 2016-06-12 09:39:43 | 887,539 | 2016-06-12 09:39:43 | https://stackoverflow.com/q/37772712 | https://stackoverflow.com/a/37772771 | <p>Just looked around in my <code>.zshrc</code> file and I think this is what you want:</p>
<pre><code>bindkey '^i' expand-or-complete-prefix
</code></pre>
<p>Where <code>^i</code> is <code><Ctrl-I></code> which is usually tab.</p>
| <p>Just looked around in my <code>.zshrc</code> file and I think this is what you want:</p> <pre><code>bindkey '^i' expand-or-complete-prefix </code></pre> <p>Where <code>^i</code> is <code><Ctrl-I></code> which is usually tab.</p> | 387, 3791, 4682, 12891 | autocomplete, bash, tab-completion, zsh | <h1>zsh: how to make tab completion need no space to next word after cursor?</h1>
<p>There is an annoying difference between <code>zsh</code> and <code>bash</code> tab completion:</p>
<p>Imagine you write some command and want to add something at the beginning of the line:</p>
<pre><code>$ compute --some --stuff
</co... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,700 | bash | # zsh: how to make tab completion need no space to next word after cursor?
There is an annoying difference between `zsh` and `bash` tab completion:
Imagine you write some command and want to add something at the beginning of the line:
```
$ compute --some --stuff
```
then you jump to the beginning of the line and l... | Just looked around in my `.zshrc` file and I think this is what you want:
```
bindkey '^i' expand-or-complete-prefix
```
Where `^i` is `<Ctrl-I>` which is usually tab. |
21000989 | How can I create a PowerShell "main" function? | 17 | 2014-01-08 16:18:05 | <p>I've used many scripting languages in the past, and am now learning PowerShell. In these other languages I typically define my main logic prior to defining my functions, so someone reading the code will focus on the main logic first. Often this takes the form of creating a "main" function or class at the top of the ... | 44,497 | 7,432 | 2024-12-12 01:24:50 | 21,001,364 | 16 | 2014-01-08 16:36:06 | 702,944 | 2016-06-17 10:52:18 | https://stackoverflow.com/q/21000989 | https://stackoverflow.com/a/21001364 | <p>Scripts are read from the top to the bottom, so you can't use any references before they are initiated. You could however create a script/scriptblock that simulates how programming languages work.</p>
<p>In programming languages like c#, the <code>main</code> part is a function. When the app is done loading the nec... | <p>Scripts are read from the top to the bottom, so you can't use any references before they are initiated. You could however create a script/scriptblock that simulates how programming languages work.</p> <p>In programming languages like c#, the <code>main</code> part is a function. When the app is done loading the nec... | 526 | powershell | <h1>How can I create a PowerShell "main" function?</h1>
<p>I've used many scripting languages in the past, and am now learning PowerShell. In these other languages I typically define my main logic prior to defining my functions, so someone reading the code will focus on the main logic first. Often this takes the form o... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,701 | bash | # How can I create a PowerShell "main" function?
I've used many scripting languages in the past, and am now learning PowerShell. In these other languages I typically define my main logic prior to defining my functions, so someone reading the code will focus on the main logic first. Often this takes the form of creatin... | Scripts are read from the top to the bottom, so you can't use any references before they are initiated. You could however create a script/scriptblock that simulates how programming languages work.
In programming languages like c#, the `main` part is a function. When the app is done loading the necessary parts(like cor... |
19961319 | reading in from stdin from a command executed with xargs | 17 | 2013-11-13 18:15:06 | <p>Using <code>xargs</code> did something I didn't quite expect, though I guess it sort of makes sense. This is not what I did, but this is an example which should show what happened.</p>
<h1>fn.sh</h1>
<pre><code>#!/usr/bin/bash
index=1
for arg in "$@"; do echo "Arg #$index = '$arg'"; let ++index;... | 8,109 | 1,366,368 | 2017-12-17 20:21:47 | 19,963,123 | 16 | 2013-11-13 19:56:13 | 1,566,221 | 2013-11-13 19:56:13 | https://stackoverflow.com/q/19961319 | https://stackoverflow.com/a/19963123 | <p>I've never used cygwin, but normally I'd do something like this:</p>
<pre><code>xargs -a <(echo boo hoo) ./fn.sh
</code></pre>
<p><code>-a</code> tells xargs to read from a file, and the <code><( )</code> syntax (which might or might not work with cygwin) is process substitution, which effectively creates a ... | <p>I've never used cygwin, but normally I'd do something like this:</p> <pre><code>xargs -a <(echo boo hoo) ./fn.sh </code></pre> <p><code>-a</code> tells xargs to read from a file, and the <code><( )</code> syntax (which might or might not work with cygwin) is process substitution, which effectively creates a ... | 387, 1731, 10326 | bash, cygwin, xargs | <h1>reading in from stdin from a command executed with xargs</h1>
<p>Using <code>xargs</code> did something I didn't quite expect, though I guess it sort of makes sense. This is not what I did, but this is an example which should show what happened.</p>
<h1>fn.sh</h1>
<pre><code>#!/usr/bin/bash
index=1
for arg in &quo... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,702 | bash | # reading in from stdin from a command executed with xargs
Using `xargs` did something I didn't quite expect, though I guess it sort of makes sense. This is not what I did, but this is an example which should show what happened.
# fn.sh
```
#!/usr/bin/bash
index=1
for arg in "$@"; do echo "Arg #$index = '$arg'"; let... | I've never used cygwin, but normally I'd do something like this:
```
xargs -a <(echo boo hoo) ./fn.sh
```
`-a` tells xargs to read from a file, and the `<( )` syntax (which might or might not work with cygwin) is process substitution, which effectively creates a named object (either a named pipe or a path starting `/... |
11450153 | Powershell analogue of Bash's `set -e` | 17 | 2012-07-12 10:44:48 | <p>How can I make Powershell behave like Bash with its flag <code>set -e</code>? <code>set -o errexit</code> makes a Bash script "Exit immediately if a simple command exits with a non-zero status". </p>
<p>I thought I could do this by setting <code>$ErrorActionPreference="Stop"</code> but this doesn't seem to work. Su... | 5,755 | 284,795 | 2024-08-07 18:52:16 | 11,450,852 | 16 | 2012-07-12 11:28:32 | 73,070 | 2021-02-24 15:17:20 | https://stackoverflow.com/q/11450153 | https://stackoverflow.com/a/11450852 | <p><code>$ErrorActionPreference</code> works as intended, it's just that exit codes from native programs are not nearly as well-behaved as PowerShell cmdlets.</p>
<p>For a <code>cmdlet</code> the error condition is fairly easy to determine: Did an exception happen or not? So the following would not reach the <code>Writ... | <p><code>$ErrorActionPreference</code> works as intended, it's just that exit codes from native programs are not nearly as well-behaved as PowerShell cmdlets.</p> <p>For a <code>cmdlet</code> the error condition is fairly easy to determine: Did an exception happen or not? So the following would not reach the <code>Writ... | 1, 387, 526 | .net, bash, powershell | <h1>Powershell analogue of Bash's `set -e`</h1>
<p>How can I make Powershell behave like Bash with its flag <code>set -e</code>? <code>set -o errexit</code> makes a Bash script "Exit immediately if a simple command exits with a non-zero status". </p>
<p>I thought I could do this by setting <code>$ErrorActionPreference... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,703 | bash | # Powershell analogue of Bash's `set -e`
How can I make Powershell behave like Bash with its flag `set -e`? `set -o errexit` makes a Bash script "Exit immediately if a simple command exits with a non-zero status".
I thought I could do this by setting `$ErrorActionPreference="Stop"` but this doesn't seem to work. Supp... | `$ErrorActionPreference` works as intended, it's just that exit codes from native programs are not nearly as well-behaved as PowerShell cmdlets.
For a `cmdlet` the error condition is fairly easy to determine: Did an exception happen or not? So the following would not reach the `Write-Host` statement with `$ErrorAction... |
11302297 | Automate import of Java (Android) projects into Eclipse workspace through commandline | 17 | 2012-07-02 22:59:20 | <p>I'm trying to automate importing projects to an Eclipse workspace via commandline (using a bash script). I have seen many posts suggesting using the CDT headless build even for non-C/C++ projects, but I want to avoid having to download CDT as my projects are all Java/Android projects and I want to be able to automat... | 5,282 | 1,426,725 | 2014-03-25 12:48:19 | 11,435,911 | 16 | 2012-07-11 15:18:27 | 398,309 | 2014-03-25 12:48:19 | https://stackoverflow.com/q/11302297 | https://stackoverflow.com/a/11435911 | <p>Unfortunately, JDT distribution doesn't have any application that would support <strong>-import</strong> argument, like CDT's <code>org.eclipse.cdt.managedbuilder.core.headlessbuild</code>. But you can easily write a simple one:</p>
<pre><code>package test.myapp;
import java.util.LinkedList;
import java.util.List;... | <p>Unfortunately, JDT distribution doesn't have any application that would support <strong>-import</strong> argument, like CDT's <code>org.eclipse.cdt.managedbuilder.core.headlessbuild</code>. But you can easily write a simple one:</p> <pre><code>package test.myapp; import java.util.LinkedList; import java.util.List;... | 17, 53, 387, 531, 1386 | android, bash, eclipse, java, scripting | <h1>Automate import of Java (Android) projects into Eclipse workspace through commandline</h1>
<p>I'm trying to automate importing projects to an Eclipse workspace via commandline (using a bash script). I have seen many posts suggesting using the CDT headless build even for non-C/C++ projects, but I want to avoid havin... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,704 | bash | # Automate import of Java (Android) projects into Eclipse workspace through commandline
I'm trying to automate importing projects to an Eclipse workspace via commandline (using a bash script). I have seen many posts suggesting using the CDT headless build even for non-C/C++ projects, but I want to avoid having to down... | Unfortunately, JDT distribution doesn't have any application that would support **-import** argument, like CDT's `org.eclipse.cdt.managedbuilder.core.headlessbuild`. But you can easily write a simple one:
```
package test.myapp;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.core.resources.IP... |
9047930 | How to uninstall own app from /system/app? | 17 | 2012-01-28 19:32:09 | <p>I'm able to install own application into /system/app using adb shell commands. But how to uninstall it? Is there any commands to do it? My phone is rooted.</p>
| 49,815 | 991,737 | 2020-04-18 16:32:42 | 9,048,026 | 16 | 2012-01-28 19:46:43 | 991,737 | 2018-11-16 11:05:22 | https://stackoverflow.com/q/9047930 | https://stackoverflow.com/a/9048026 | <p>Manual uninstall using ADB :<br>
<a href="http://www.careace.net/2010/05/12/how-to-remove-android-apps-through-adb/" rel="nofollow noreferrer">http://www.careace.net/2010/05/12/how-to-remove-android-apps-through-adb/</a></p>
<p>During website downtime (like now) see crawled snapshot here:<br>
<a href="https://web.a... | <p>Manual uninstall using ADB :<br> <a href="http://www.careace.net/2010/05/12/how-to-remove-android-apps-through-adb/" rel="nofollow noreferrer">http://www.careace.net/2010/05/12/how-to-remove-android-apps-through-adb/</a></p> <p>During website downtime (like now) see crawled snapshot here:<br> <a href="https://web.a... | 390, 1386, 14038 | android, shell, uninstallation | <h1>How to uninstall own app from /system/app?</h1>
<p>I'm able to install own application into /system/app using adb shell commands. But how to uninstall it? Is there any commands to do it? My phone is rooted.</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,705 | bash | # How to uninstall own app from /system/app?
I'm able to install own application into /system/app using adb shell commands. But how to uninstall it? Is there any commands to do it? My phone is rooted. | Manual uninstall using ADB :
<http://www.careace.net/2010/05/12/how-to-remove-android-apps-through-adb/>
During website downtime (like now) see crawled snapshot here:
<https://web.archive.org/web/20180222063358/http://www.careace.net/2010/05/12/how-to-remove-android-apps-through-adb/>
Programmatically:
```
p... |
7154800 | What is the Bash Escape Character "\c"? | 17 | 2011-08-22 23:33:21 | <p>What is the name and function of the <code>\c</code> escape character in Bash? What is its numeric value? I have seen that <code>\cx</code> is a control character, but what about plain <code>\c</code>? It seems that:</p>
<pre><code>echo -e "Hello World\c"
</code></pre>
<p>and</p>
<pre><code>echo -en "Hello World"... | 29,915 | 834,176 | 2021-07-30 08:02:57 | 7,154,820 | 16 | 2011-08-22 23:37:18 | 14,860 | 2011-08-22 23:47:08 | https://stackoverflow.com/q/7154800 | https://stackoverflow.com/a/7154820 | <p>That's actually specific to some versions of <code>echo</code> (I'm pretty sure that <code>\c</code> came from SysV while the <code>-n</code> version was a BSD-ism).</p>
<p>It simply means don't output the trailing newline.</p>
| <p>That's actually specific to some versions of <code>echo</code> (I'm pretty sure that <code>\c</code> came from SysV while the <code>-n</code> version was a BSD-ism).</p> <p>It simply means don't output the trailing newline.</p> | 34, 387, 4804, 13824 | bash, echo, escaping, unix | <h1>What is the Bash Escape Character "\c"?</h1>
<p>What is the name and function of the <code>\c</code> escape character in Bash? What is its numeric value? I have seen that <code>\cx</code> is a control character, but what about plain <code>\c</code>? It seems that:</p>
<pre><code>echo -e "Hello World\c"
</code></pr... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,706 | bash | # What is the Bash Escape Character "\c"?
What is the name and function of the `\c` escape character in Bash? What is its numeric value? I have seen that `\cx` is a control character, but what about plain `\c`? It seems that:
```
echo -e "Hello World\c"
```
and
```
echo -en "Hello World"
```
are equivalent. Howeve... | That's actually specific to some versions of `echo` (I'm pretty sure that `\c` came from SysV while the `-n` version was a BSD-ism).
It simply means don't output the trailing newline. |
6931873 | Powershell: how to implement standard switches? | 17 | 2011-08-03 19:06:26 | <p>For things like -WhatIf, we have $PSCmdlet.ShouldProcess() given to us by the [CmdletBinding] attribute. Are there other such tools or practices for implementing common command line arguments such as -Verbose, -Debug, -PassThru, etc?</p>
| 2,448 | 307,163 | 2011-08-04 12:47:09 | 6,933,098 | 16 | 2011-08-03 20:48:29 | 291,709 | 2011-08-04 12:47:09 | https://stackoverflow.com/q/6931873 | https://stackoverflow.com/a/6933098 | <p><code>Write-Debug</code> and <code>Write-Verbose</code> handle the <code>-Debug</code> and <code>-Verbose</code> parameters automatically.</p>
<p><code>-PassThru</code> isn't technically a common parameter, but you can implement it like:</p>
<pre><code>function PassTest {
param(
[switch] $PassThru
... | <p><code>Write-Debug</code> and <code>Write-Verbose</code> handle the <code>-Debug</code> and <code>-Verbose</code> parameters automatically.</p> <p><code>-PassThru</code> isn't technically a common parameter, but you can implement it like:</p> <pre><code>function PassTest { param( [switch] $PassThru ... | 277, 526, 28622, 31134, 35061 | command-line-arguments, debugging, passthru, powershell, verbose | <h1>Powershell: how to implement standard switches?</h1>
<p>For things like -WhatIf, we have $PSCmdlet.ShouldProcess() given to us by the [CmdletBinding] attribute. Are there other such tools or practices for implementing common command line arguments such as -Verbose, -Debug, -PassThru, etc?</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,707 | bash | # Powershell: how to implement standard switches?
For things like -WhatIf, we have $PSCmdlet.ShouldProcess() given to us by the [CmdletBinding] attribute. Are there other such tools or practices for implementing common command line arguments such as -Verbose, -Debug, -PassThru, etc? | `Write-Debug` and `Write-Verbose` handle the `-Debug` and `-Verbose` parameters automatically.
`-PassThru` isn't technically a common parameter, but you can implement it like:
```
function PassTest {
param(
[switch] $PassThru
)
process {
if($PassThru) {$_}
}
}
1..10|PassTest -PassThru... |
5130190 | Force a shell script to fflush | 17 | 2011-02-26 22:40:52 | <p>I was wondering if it was possible to tell bash that all calls to <code>echo</code> or <code>printf</code> should be followed up by a subsequent call to <code>fflush()</code> on stdout/stderr respectively?</p>
<p>A quick and dirty solution would be to write my own printf implementation that did this and use it in l... | 30,382 | null | 2017-09-24 16:22:43 | 5,140,923 | 16 | 2011-02-28 10:42:24 | 4,421 | 2017-09-24 16:22:43 | https://stackoverflow.com/q/5130190 | https://stackoverflow.com/a/5140923 | <p>If comands use stdio and are connected to a terminal they'll be flushed per line.
Otherwise you'll need to use something like stdbuf on commands in a pipe line
<a href="http://www.pixelbeat.org/programming/stdio_buffering/" rel="noreferrer">http://www.pixelbeat.org/programming/stdio_buffering/</a></p>
<p>tl;dr: ins... | <p>If comands use stdio and are connected to a terminal they'll be flushed per line. Otherwise you'll need to use something like stdbuf on commands in a pipe line <a href="http://www.pixelbeat.org/programming/stdio_buffering/" rel="noreferrer">http://www.pixelbeat.org/programming/stdio_buffering/</a></p> <p>tl;dr: ins... | 58, 387, 390 | bash, linux, shell | <h1>Force a shell script to fflush</h1>
<p>I was wondering if it was possible to tell bash that all calls to <code>echo</code> or <code>printf</code> should be followed up by a subsequent call to <code>fflush()</code> on stdout/stderr respectively?</p>
<p>A quick and dirty solution would be to write my own printf impl... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,708 | bash | # Force a shell script to fflush
I was wondering if it was possible to tell bash that all calls to `echo` or `printf` should be followed up by a subsequent call to `fflush()` on stdout/stderr respectively?
A quick and dirty solution would be to write my own printf implementation that did this and use it in lieu of ei... | If comands use stdio and are connected to a terminal they'll be flushed per line.
Otherwise you'll need to use something like stdbuf on commands in a pipe line
<http://www.pixelbeat.org/programming/stdio_buffering/>
tl;dr: instead of `printf ...` try to put to the script `stdbuf -o0 printf ..`, or `stdbuf -oL printf .... |
4547789 | command line arguments in bash to Rscript | 17 | 2010-12-28 17:05:08 | <p>I have a bash script that creates a csv file and an R file that creates graphs from that.</p>
<p>At the end of the bash script I call <code>Rscript Graphs.R 10</code></p>
<p>The response I get is as follows:</p>
<pre><code>Error in is.vector(X) : subscript out of bounds
Calls: print ... <Anonymous> -> la... | 20,340 | 556,211 | 2012-11-29 06:11:03 | 4,574,903 | 16 | 2011-01-01 17:27:30 | 89,806 | 2011-01-02 22:20:14 | https://stackoverflow.com/q/4547789 | https://stackoverflow.com/a/4574903 | <p>With the following in args.R</p>
<pre><code>print(commandArgs(TRUE)[1])
</code></pre>
<p>and the following in args.sh</p>
<pre><code>Rscript args.R 10
</code></pre>
<p>I get the following output from <code>bash args.sh</code></p>
<pre><code>[1] "10"
</code></pre>
<p>and no error. If necessary, convert to a num... | <p>With the following in args.R</p> <pre><code>print(commandArgs(TRUE)[1]) </code></pre> <p>and the following in args.sh</p> <pre><code>Rscript args.R 10 </code></pre> <p>I get the following output from <code>bash args.sh</code></p> <pre><code>[1] "10" </code></pre> <p>and no error. If necessary, convert to a num... | 387, 2313, 4452 | arguments, bash, r | <h1>command line arguments in bash to Rscript</h1>
<p>I have a bash script that creates a csv file and an R file that creates graphs from that.</p>
<p>At the end of the bash script I call <code>Rscript Graphs.R 10</code></p>
<p>The response I get is as follows:</p>
<pre><code>Error in is.vector(X) : subscript out of... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,709 | bash | # command line arguments in bash to Rscript
I have a bash script that creates a csv file and an R file that creates graphs from that.
At the end of the bash script I call `Rscript Graphs.R 10`
The response I get is as follows:
```
Error in is.vector(X) : subscript out of bounds
Calls: print ... <Anonymous> -> lappl... | With the following in args.R
```
print(commandArgs(TRUE)[1])
```
and the following in args.sh
```
Rscript args.R 10
```
I get the following output from `bash args.sh`
```
[1] "10"
```
and no error. If necessary, convert to a numberic type using `as.numeric(commandArgs(TRUE)[1])`. |
1510481 | How can I detect that emacs-server is running from a shell prompt? | 17 | 2009-10-02 16:06:54 | <p>I want to have my .bashrc detect if running emacsclient would work in lieu of running emacs. Basically:</p>
<pre><code>if emacs_server_is_running; then
EDITOR=emacsclient
VISUAL=emacsclient
else
EDITOR=emacs
VISUAL=emacs
fi
</code></pre>
<p>What would I put in the <code>emacs_server_is_running</co... | 9,280 | 23,309 | 2021-03-04 05:10:46 | 1,510,753 | 16 | 2009-10-02 17:03:11 | 32,538 | 2009-10-02 17:03:11 | https://stackoverflow.com/q/1510481 | https://stackoverflow.com/a/1510753 | <p>You're making this too hard. From the the <code>emacsclient(1)</code> man page:</p>
<blockquote>
-a, --alternate-editor=EDITOR
if the Emacs server is not running, run the specified editor instead. This can also be specified via the `ALTERNATE_EDITOR' environment variable.
If the value of EDITOR is the empty str... | <p>You're making this too hard. From the the <code>emacsclient(1)</code> man page:</p> <blockquote> -a, --alternate-editor=EDITOR if the Emacs server is not running, run the specified editor instead. This can also be specified via the `ALTERNATE_EDITOR' environment variable. If the value of EDITOR is the empty str... | 387, 390 | bash, shell | <h1>How can I detect that emacs-server is running from a shell prompt?</h1>
<p>I want to have my .bashrc detect if running emacsclient would work in lieu of running emacs. Basically:</p>
<pre><code>if emacs_server_is_running; then
EDITOR=emacsclient
VISUAL=emacsclient
else
EDITOR=emacs
VISUAL=emacs
fi... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,710 | bash | # How can I detect that emacs-server is running from a shell prompt?
I want to have my .bashrc detect if running emacsclient would work in lieu of running emacs. Basically:
```
if emacs_server_is_running; then
EDITOR=emacsclient
VISUAL=emacsclient
else
EDITOR=emacs
VISUAL=emacs
fi
```
What would I pu... | You're making this too hard. From the the `emacsclient(1)` man page:
> -a, --alternate-editor=EDITOR
> if the Emacs server is not running, run the specified editor instead. This can also be specified via the `ALTERNATE_EDITOR' environment variable.
> If the value of EDITOR is the empty string, then Emacs is started in... |
25360470 | ffmpeg capture current frame and overwrite the image output file | 16 | 2014-08-18 09:48:39 | <p>I am trying to extract the image file from a RTSP stream url every second (could be every 1 min also) and overwrite this image file.</p>
<p>my below code works but it outputs to multiple image jpg files: <code>img1.jpg, img2.jpg, img3.jpg...</code></p>
<pre><code>ffmpeg -i rtsp://IP_ADDRESS/live.sdp -f image2 -r 1... | 49,500 | 1,217,856 | 2022-05-17 05:52:00 | 25,379,282 | 16 | 2014-08-19 08:53:11 | 928,492 | 2014-08-19 08:53:11 | https://stackoverflow.com/q/25360470 | https://stackoverflow.com/a/25379282 | <p>Following command line should work for you. </p>
<pre><code>ffmpeg -i rtsp://IP_ADDRESS/live.sdp -f image2 -updatefirst 1 img.jpg
</code></pre>
| <p>Following command line should work for you. </p> <pre><code>ffmpeg -i rtsp://IP_ADDRESS/live.sdp -f image2 -updatefirst 1 img.jpg </code></pre> | 387, 3847 | bash, ffmpeg | <h1>ffmpeg capture current frame and overwrite the image output file</h1>
<p>I am trying to extract the image file from a RTSP stream url every second (could be every 1 min also) and overwrite this image file.</p>
<p>my below code works but it outputs to multiple image jpg files: <code>img1.jpg, img2.jpg, img3.jpg...<... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,711 | bash | # ffmpeg capture current frame and overwrite the image output file
I am trying to extract the image file from a RTSP stream url every second (could be every 1 min also) and overwrite this image file.
my below code works but it outputs to multiple image jpg files: `img1.jpg, img2.jpg, img3.jpg...`
```
ffmpeg -i rtsp:... | Following command line should work for you.
```
ffmpeg -i rtsp://IP_ADDRESS/live.sdp -f image2 -updatefirst 1 img.jpg
``` |
14859148 | How to set a conditional newline in PS1? | 16 | 2013-02-13 17:17:15 | <p>I am trying to set <code>PS1</code> so that it prints out something just right after login, but preceded with a newline later.</p>
<p>Suppose <code>export PS1="\h:\W \u\$ "</code>, so first time (i.e., right after login) you get:</p>
<pre><code>hostname:~ username$
</code></pre>
<p>I’ve been trying something lik... | 8,110 | 11,895 | 2021-11-09 16:39:50 | 14,859,615 | 16 | 2013-02-13 17:40:24 | 7,412 | 2013-02-13 17:40:24 | https://stackoverflow.com/q/14859148 | https://stackoverflow.com/a/14859615 | <p>Try the following:</p>
<pre><code>function __ps1_newline_login {
if [[ -z "${PS1_NEWLINE_LOGIN}" ]]; then
PS1_NEWLINE_LOGIN=true
else
printf '\n'
fi
}
PROMPT_COMMAND='__ps1_newline_login'
export PS1="\h:\W \u\$ "
</code></pre>
<p>Explanation:</p>
<ul>
<li><code>PROMPT_COMMAND</code> is a special ba... | <p>Try the following:</p> <pre><code>function __ps1_newline_login { if [[ -z "${PS1_NEWLINE_LOGIN}" ]]; then PS1_NEWLINE_LOGIN=true else printf '\n' fi } PROMPT_COMMAND='__ps1_newline_login' export PS1="\h:\W \u\$ " </code></pre> <p>Explanation:</p> <ul> <li><code>PROMPT_COMMAND</code> is a special ba... | 387, 390, 53034 | bash, ps1, shell | <h1>How to set a conditional newline in PS1?</h1>
<p>I am trying to set <code>PS1</code> so that it prints out something just right after login, but preceded with a newline later.</p>
<p>Suppose <code>export PS1="\h:\W \u\$ "</code>, so first time (i.e., right after login) you get:</p>
<pre><code>hostname:~ username$... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,712 | bash | # How to set a conditional newline in PS1?
I am trying to set `PS1` so that it prints out something just right after login, but preceded with a newline later.
Suppose `export PS1="\h:\W \u\$ "`, so first time (i.e., right after login) you get:
```
hostname:~ username$
```
I’ve been trying something like in my `~/.b... | Try the following:
```
function __ps1_newline_login {
if [[ -z "${PS1_NEWLINE_LOGIN}" ]]; then
PS1_NEWLINE_LOGIN=true
else
printf '\n'
fi
}
PROMPT_COMMAND='__ps1_newline_login'
export PS1="\h:\W \u\$ "
```
Explanation:
- `PROMPT_COMMAND` is a special bash variable which is executed every time before t... |
11673287 | How to remove a word prefix using grep? | 16 | 2012-07-26 15:56:29 | <p>How can I remove the beginning of a word using grep? For example, I have a file that contains this:</p>
<pre><code>www.abc.com
</code></pre>
<p>I only need the this part:</p>
<pre><code>abc.com
</code></pre>
<p>Sorry for the basic question, but I have no experience with Linux.</p>
| 62,608 | 1,476,749 | 2023-07-15 20:07:41 | 11,673,362 | 16 | 2012-07-26 16:01:34 | 25,450 | 2012-07-27 12:30:24 | https://stackoverflow.com/q/11673287 | https://stackoverflow.com/a/11673362 | <p>You don't edit strings with <code>grep</code> in Unix shell, <code>grep</code> is usually used to find or remove some lines from the text. You'd rather use <code>sed</code> instead:</p>
<pre><code>$ echo www.example.com | sed 's/^[^\.]\+\.//'
example.com
</code></pre>
<p>You'll need to learn regular expressions <a... | <p>You don't edit strings with <code>grep</code> in Unix shell, <code>grep</code> is usually used to find or remove some lines from the text. You'd rather use <code>sed</code> instead:</p> <pre><code>$ echo www.example.com | sed 's/^[^\.]\+\.//' example.com </code></pre> <p>You'll need to learn regular expressions <a... | 18, 58, 390, 5282 | linux, regex, sed, shell | <h1>How to remove a word prefix using grep?</h1>
<p>How can I remove the beginning of a word using grep? For example, I have a file that contains this:</p>
<pre><code>www.abc.com
</code></pre>
<p>I only need the this part:</p>
<pre><code>abc.com
</code></pre>
<p>Sorry for the basic question, but I have no experience wi... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,713 | bash | # How to remove a word prefix using grep?
How can I remove the beginning of a word using grep? For example, I have a file that contains this:
```
www.abc.com
```
I only need the this part:
```
abc.com
```
Sorry for the basic question, but I have no experience with Linux. | You don't edit strings with `grep` in Unix shell, `grep` is usually used to find or remove some lines from the text. You'd rather use `sed` instead:
```
$ echo www.example.com | sed 's/^[^\.]\+\.//'
example.com
```
You'll need to learn regular expressions [to use it effectively](http://www.grymoire.com/Unix/Sed.html)... |
8627819 | How to print result of shell script in CMake? | 16 | 2011-12-25 01:39:53 | <p>If I want to check currently exported environment variables, I do this in shell.</p>
<pre><code>export
</code></pre>
<p>In CMake, I do this to print something.</p>
<pre><code>MESSAGE ("This is message.")
</code></pre>
<p>How can I print former one with CMake?</p>
<p>I know that CMake is stand for cross-platform... | 32,048 | 246,776 | 2011-12-25 09:25:04 | 8,628,994 | 16 | 2011-12-25 09:25:04 | 13,051 | 2011-12-25 09:25:04 | https://stackoverflow.com/q/8627819 | https://stackoverflow.com/a/8628994 | <p>If you want to know the value of a specific variable, you can use <code>$ENV{varname}</code>:</p>
<pre><code>message(STATUS $ENV{PATH})
</code></pre>
<p>If you want to see <strong>all</strong> variables, you probably need to resort to invoking an external command such as <code>env</code> (on Unix) or <code>set</co... | <p>If you want to know the value of a specific variable, you can use <code>$ENV{varname}</code>:</p> <pre><code>message(STATUS $ENV{PATH}) </code></pre> <p>If you want to see <strong>all</strong> variables, you probably need to resort to invoking an external command such as <code>env</code> (on Unix) or <code>set</co... | 87, 390, 8822, 9013 | cmake, environment-variables, printing, shell | <h1>How to print result of shell script in CMake?</h1>
<p>If I want to check currently exported environment variables, I do this in shell.</p>
<pre><code>export
</code></pre>
<p>In CMake, I do this to print something.</p>
<pre><code>MESSAGE ("This is message.")
</code></pre>
<p>How can I print former one with CMake... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,714 | bash | # How to print result of shell script in CMake?
If I want to check currently exported environment variables, I do this in shell.
```
export
```
In CMake, I do this to print something.
```
MESSAGE ("This is message.")
```
How can I print former one with CMake?
I know that CMake is stand for cross-platform building... | If you want to know the value of a specific variable, you can use `$ENV{varname}`:
```
message(STATUS $ENV{PATH})
```
If you want to see **all** variables, you probably need to resort to invoking an external command such as `env` (on Unix) or `set` (on Windows):
```
# Windows
execute_process(COMMAND cmd /c set OUTPU... |
5265890 | Writing to error stream in Powershell using Write-Error | 16 | 2011-03-10 21:04:03 | <p>Why isn't Powershell's <a href="http://technet.microsoft.com/en-us/library/dd315265.aspx" rel="noreferrer"><code>Write-Error</code></a> cmdlet working for me? My output doesn't look like the examples in the documentation:</p>
<pre><code>PS C:\> Write-Error "This is an error"
Write-Error "This is an error" : This... | 58,161 | 111,327 | 2021-10-29 17:52:14 | 5,654,822 | 16 | 2011-04-13 19:53:31 | 24,315 | 2011-04-13 20:00:13 | https://stackoverflow.com/q/5265890 | https://stackoverflow.com/a/5654822 | <p>To get output similar to write-warning, you can do this:</p>
<pre><code>$Host.UI.WriteErrorLine("This is an error")
</code></pre>
<p>(props to Chris Sears for this answer)</p>
| <p>To get output similar to write-warning, you can do this:</p> <pre><code>$Host.UI.WriteErrorLine("This is an error") </code></pre> <p>(props to Chris Sears for this answer)</p> | 526, 66845 | powershell, write-error | <h1>Writing to error stream in Powershell using Write-Error</h1>
<p>Why isn't Powershell's <a href="http://technet.microsoft.com/en-us/library/dd315265.aspx" rel="noreferrer"><code>Write-Error</code></a> cmdlet working for me? My output doesn't look like the examples in the documentation:</p>
<pre><code>PS C:\> Wri... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,715 | bash | # Writing to error stream in Powershell using Write-Error
Why isn't Powershell's [`Write-Error`](http://technet.microsoft.com/en-us/library/dd315265.aspx) cmdlet working for me? My output doesn't look like the examples in the documentation:
```
PS C:\> Write-Error "This is an error"
Write-Error "This is an error" : T... | To get output similar to write-warning, you can do this:
```
$Host.UI.WriteErrorLine("This is an error")
```
(props to Chris Sears for this answer) |
2640374 | bash "map" equivalent: run command on each file | 16 | 2010-04-14 19:25:11 | <p>I often have a command that processes one file, and I want to run it on every file in a directory. Is there any built-in way to do this? </p>
<p>For example, say I have a program <code>data</code> which outputs an important number about a file:</p>
<pre><code>./data foo
137
./data bar
42
</code></pre>
<p>I want t... | 14,302 | 15,055 | 2015-08-16 23:34:33 | 2,657,287 | 16 | 2010-04-17 04:53:48 | 317,052 | 2010-04-17 04:53:48 | https://stackoverflow.com/q/2640374 | https://stackoverflow.com/a/2657287 | <p>If you are just trying to execute your <code>data</code> program on a bunch of files, the easiest/least complicated way is to use <code>-exec</code> in <code>find</code>.</p>
<p>Say you wanted to execute <code>data</code> on all txt files in the current directory (and subdirectories). This is all you'd need:</p>
<... | <p>If you are just trying to execute your <code>data</code> program on a bunch of files, the easiest/least complicated way is to use <code>-exec</code> in <code>find</code>.</p> <p>Say you wanted to execute <code>data</code> on all txt files in the current directory (and subdirectories). This is all you'd need:</p> <... | 387, 390, 1834 | bash, dictionary, shell | <h1>bash "map" equivalent: run command on each file</h1>
<p>I often have a command that processes one file, and I want to run it on every file in a directory. Is there any built-in way to do this? </p>
<p>For example, say I have a program <code>data</code> which outputs an important number about a file:</p>
<pre><cod... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,716 | bash | # bash "map" equivalent: run command on each file
I often have a command that processes one file, and I want to run it on every file in a directory. Is there any built-in way to do this?
For example, say I have a program `data` which outputs an important number about a file:
```
./data foo
137
./data bar
42
```
I w... | If you are just trying to execute your `data` program on a bunch of files, the easiest/least complicated way is to use `-exec` in `find`.
Say you wanted to execute `data` on all txt files in the current directory (and subdirectories). This is all you'd need:
```
find . -name "*.txt" -exec data {} \;
```
If you wante... |
1603389 | Shell: simple way to get all lines before first blank line | 16 | 2009-10-21 20:26:37 | <p>What's the best shell command to output the lines of a file until you encounter the first blank line? For example:</p>
<pre><code>output these
lines
but do not output anything after the above blank line
(or the blank line itself)
</code></pre>
<p>awk? something else?</p>
| 14,111 | 157,237 | 2009-10-22 13:20:09 | 1,603,436 | 16 | 2009-10-21 20:33:03 | 42,706 | 2009-10-21 20:33:03 | https://stackoverflow.com/q/1603389 | https://stackoverflow.com/a/1603436 | <pre><code>sed -e '/^$/,$d' <<EOF
this is text
so is this
but not this
or this
EOF
</code></pre>
| <pre><code>sed -e '/^$/,$d' <<EOF this is text so is this but not this or this EOF </code></pre> | 390, 990 | awk, shell | <h1>Shell: simple way to get all lines before first blank line</h1>
<p>What's the best shell command to output the lines of a file until you encounter the first blank line? For example:</p>
<pre><code>output these
lines
but do not output anything after the above blank line
(or the blank line itself)
</code></pre>
<p... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,717 | bash | # Shell: simple way to get all lines before first blank line
What's the best shell command to output the lines of a file until you encounter the first blank line? For example:
```
output these
lines
but do not output anything after the above blank line
(or the blank line itself)
```
awk? something else? | ```
sed -e '/^$/,$d' <<EOF
this is text
so is this
but not this
or this
EOF
``` |
54607309 | How to detect OS and load ZSH settings conditionally? | 15 | 2019-02-09 14:45:01 | <p>I use several different OS's at home and work and I want to be able to load platorm-specific ZSH settings conditionally, depending on which OS I'm using at the given moment.</p>
<p>I tried this but it doesn't load everything I expect:</p>
<pre><code># Condtitional loading of zsh settings per platform
if command a... | 9,378 | 327,619 | 2023-02-09 03:08:42 | 54,618,022 | 16 | 2019-02-10 15:37:10 | 4,432,299 | 2023-02-09 03:08:42 | https://stackoverflow.com/q/54607309 | https://stackoverflow.com/a/54618022 | <h2>Revised Answer (2020-Feb-09)</h2>
<p>Thanks to @Cyberbeni for reminding me that <code>apt</code> on macOS would incorrectly match the system Java runtime's <strong>A</strong>nnotation <strong>P</strong>rocessing <strong>T</strong>ool. Rolling up the necessary changes, we now have:</p>
<pre class="lang-bash prettypr... | <h2>Revised Answer (2020-Feb-09)</h2> <p>Thanks to @Cyberbeni for reminding me that <code>apt</code> on macOS would incorrectly match the system Java runtime's <strong>A</strong>nnotation <strong>P</strong>rocessing <strong>T</strong>ool. Rolling up the necessary changes, we now have:</p> <pre class="lang-bash prettypr... | 58, 387, 390, 3791, 93854 | bash, linux, oh-my-zsh, shell, zsh | <h1>How to detect OS and load ZSH settings conditionally?</h1>
<p>I use several different OS's at home and work and I want to be able to load platorm-specific ZSH settings conditionally, depending on which OS I'm using at the given moment.</p>
<p>I tried this but it doesn't load everything I expect:</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 | 8,718 | bash | # How to detect OS and load ZSH settings conditionally?
I use several different OS's at home and work and I want to be able to load platorm-specific ZSH settings conditionally, depending on which OS I'm using at the given moment.
I tried this but it doesn't load everything I expect:
```
# Condtitional loading of zsh... | ## Revised Answer (2020-Feb-09)
Thanks to @Cyberbeni for reminding me that `apt` on macOS would incorrectly match the system Java runtime's **A**nnotation **P**rocessing **T**ool. Rolling up the necessary changes, we now have:
```
# What OS are we running?
if [[ $(uname) == "Darwin" ]]; then
source "$ZSH_CUSTOM"/... |
42822661 | oh-my-zsh: git maximum nested function level reached | 15 | 2017-03-15 23:29:22 | <p>Get an error when I use standard git command:</p>
<pre><code>[~/site]$ git branch
git:1: maximum nested function level reached
</code></pre>
<p>.zshrc:</p>
<pre><code>plugins=(git osx colored-man gem brew go bundler rake rails)
source $ZSH/oh-my-zsh.sh
</code></pre>
| 26,523 | 5,225,464 | 2024-06-26 16:10:48 | 42,822,796 | 16 | 2017-03-15 23:42:49 | 5,225,464 | 2017-03-15 23:42:49 | https://stackoverflow.com/q/42822661 | https://stackoverflow.com/a/42822796 | <p>My mistake, I moved bash function to zsh:</p>
<pre><code>gr() {
git rebase -i HEAD~$1
}
</code></pre>
<p>Solution:</p>
<pre><code>function gr() {
git rebase -i HEAD~$1
}
</code></pre>
| <p>My mistake, I moved bash function to zsh:</p> <pre><code>gr() { git rebase -i HEAD~$1 } </code></pre> <p>Solution:</p> <pre><code>function gr() { git rebase -i HEAD~$1 } </code></pre> | 387, 390, 391, 3791, 93854 | bash, oh-my-zsh, shell, terminal, zsh | <h1>oh-my-zsh: git maximum nested function level reached</h1>
<p>Get an error when I use standard git command:</p>
<pre><code>[~/site]$ git branch
git:1: maximum nested function level reached
</code></pre>
<p>.zshrc:</p>
<pre><code>plugins=(git osx colored-man gem brew go bundler rake rails)
source $ZSH/oh-my-zsh.sh... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,720 | bash | # oh-my-zsh: git maximum nested function level reached
Get an error when I use standard git command:
```
[~/site]$ git branch
git:1: maximum nested function level reached
```
.zshrc:
```
plugins=(git osx colored-man gem brew go bundler rake rails)
source $ZSH/oh-my-zsh.sh
``` | My mistake, I moved bash function to zsh:
```
gr() {
git rebase -i HEAD~$1
}
```
Solution:
```
function gr() {
git rebase -i HEAD~$1
}
``` |
38135995 | how to open a gnome terminal to execute a command with gnome-terminal, constantly? | 15 | 2016-07-01 02:15:58 | <p>I have a sh file which includes those lines:</p>
<pre><code>gnome-terminal\
--tab\
--title="ElasticSearch"\
--working-directory="/home/username/program/bin"\
-e "bash -c './somecommand'"\
</code></pre>
<p>when I run it, a gnome terminal will open and run a command for me. The problem is, when I pres... | 26,535 | 6,151,945 | 2019-07-22 10:19:24 | 38,137,852 | 16 | 2016-07-01 05:44:29 | 5,291,015 | 2016-07-01 05:44:29 | https://stackoverflow.com/q/38135995 | https://stackoverflow.com/a/38137852 | <p>Your command works fine but the <code>gnome-terminal</code> closes after the <code>somecommand</code> terminates, the reason being <code>gnome-terminal</code> not running the <code>bash</code> as it's default shell.</p>
<p>To get the bash prompt(<code>$</code>) after the command command completes, you need to trigg... | <p>Your command works fine but the <code>gnome-terminal</code> closes after the <code>somecommand</code> terminates, the reason being <code>gnome-terminal</code> not running the <code>bash</code> as it's default shell.</p> <p>To get the bash prompt(<code>$</code>) after the command command completes, you need to trigg... | 387, 32965 | bash, gnome-terminal | <h1>how to open a gnome terminal to execute a command with gnome-terminal, constantly?</h1>
<p>I have a sh file which includes those lines:</p>
<pre><code>gnome-terminal\
--tab\
--title="ElasticSearch"\
--working-directory="/home/username/program/bin"\
-e "bash -c './somecommand'"\
</code></pre>
<p>when... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,721 | bash | # how to open a gnome terminal to execute a command with gnome-terminal, constantly?
I have a sh file which includes those lines:
```
gnome-terminal\
--tab\
--title="ElasticSearch"\
--working-directory="/home/username/program/bin"\
-e "bash -c './somecommand'"\
```
when I run it, a gnome terminal will ... | Your command works fine but the `gnome-terminal` closes after the `somecommand` terminates, the reason being `gnome-terminal` not running the `bash` as it's default shell.
To get the bash prompt(`$`) after the command command completes, you need to trigger it back.
```
-e "bash -c ./somecommand;bash"\
``` |
34252265 | How to start MingW Console (GitBash) from Command Line on Windows? | 15 | 2015-12-13 14:40:31 | <p>I'm trying to automate my work environment set up using a batch file. I'm stuck at a point where I am not able to start the MingW64 Console from command line.</p>
<p><code>start "" "%ProgramFiles%\Git\bin\sh.exe" --login</code> works fine but it seems to open a different shell window than that I am looking for. I'l... | 31,307 | 205,024 | 2023-07-18 04:15:08 | 34,252,558 | 16 | 2015-12-13 15:10:42 | 6,309 | 2015-12-14 18:33:36 | https://stackoverflow.com/q/34252265 | https://stackoverflow.com/a/34252558 | <p><code>git-bash.exe -i -c "/bin/bash"</code> seems to work better.<br>
<a href="https://github.com/Maximus5/ConEmu/issues/176" rel="noreferrer">This issue</a> illustrates various other ways to call <code>git-bash.exe</code>, but concludes:</p>
<blockquote>
<p>Preferred way to run git-for-windows is using <code>git... | <p><code>git-bash.exe -i -c "/bin/bash"</code> seems to work better.<br> <a href="https://github.com/Maximus5/ConEmu/issues/176" rel="noreferrer">This issue</a> illustrates various other ways to call <code>git-bash.exe</code>, but concludes:</p> <blockquote> <p>Preferred way to run git-for-windows is using <code>git... | 64, 1231, 7002, 61874 | batch-file, command-line, git-bash, windows | <h1>How to start MingW Console (GitBash) from Command Line on Windows?</h1>
<p>I'm trying to automate my work environment set up using a batch file. I'm stuck at a point where I am not able to start the MingW64 Console from command line.</p>
<p><code>start "" "%ProgramFiles%\Git\bin\sh.exe" --login</code> works fine b... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,722 | bash | # How to start MingW Console (GitBash) from Command Line on Windows?
I'm trying to automate my work environment set up using a batch file. I'm stuck at a point where I am not able to start the MingW64 Console from command line.
`start "" "%ProgramFiles%\Git\bin\sh.exe" --login` works fine but it seems to open a diffe... | `git-bash.exe -i -c "/bin/bash"` seems to work better.
[This issue](https://github.com/Maximus5/ConEmu/issues/176) illustrates various other ways to call `git-bash.exe`, but concludes:
> Preferred way to run git-for-windows is using `git-cmd.exe`:
```
c:\git\git-cmd.exe --command=usr/bin/bash.exe -l -i
```
That ho... |
33434465 | What does a | (pipe character) do in a shell (bash) command? | 15 | 2015-10-30 11:03:11 | <p>I have to run this command to install NPM. What does it do? What is the | at the end?</p>
<pre><code>curl https://raw.githubusercontent.com/creationix/nvm/v0.23.2/install.sh | bash
</code></pre>
<p>Also, am I running UNIX-like commands in Bash? Why does this work? Is it that Bash is a UNIX-command compatible inter... | 16,649 | 2,714,301 | 2023-11-25 15:34:17 | 33,436,245 | 16 | 2015-10-30 12:41:59 | 2,052,623 | 2023-11-25 15:34:17 | https://stackoverflow.com/q/33434465 | https://stackoverflow.com/a/33436245 | <p>In Bash (and most *nix shells), the <code>|</code> (pipe) metacharacter¹ causes the shell to take the output from one command and uses it as the input for the next command.</p>
<p>What you are doing here is using <code>curl</code> to retrieve the <code>install.sh</code> file and then output its contents into <code>b... | <p>In Bash (and most *nix shells), the <code>|</code> (pipe) metacharacter¹ causes the shell to take the output from one command and uses it as the input for the next command.</p> <p>What you are doing here is using <code>curl</code> to retrieve the <code>install.sh</code> file and then output its contents into <code>b... | 387 | bash | <h1>What does a | (pipe character) do in a shell (bash) command?</h1>
<p>I have to run this command to install NPM. What does it do? What is the | at the end?</p>
<pre><code>curl https://raw.githubusercontent.com/creationix/nvm/v0.23.2/install.sh | bash
</code></pre>
<p>Also, am I running UNIX-like commands in Bash? ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,723 | bash | # What does a | (pipe character) do in a shell (bash) command?
I have to run this command to install NPM. What does it do? What is the | at the end?
```
curl https://raw.githubusercontent.com/creationix/nvm/v0.23.2/install.sh | bash
```
Also, am I running UNIX-like commands in Bash? Why does this work? Is it that Ba... | In Bash (and most *nix shells), the `|` (pipe) metacharacter¹ causes the shell to take the output from one command and uses it as the input for the next command.
What you are doing here is using `curl` to retrieve the `install.sh` file and then output its contents into `bash`, which is a shell that will execute the co... |
27846505 | How to add properties to a PowerShell object from an array | 15 | 2015-01-08 17:54:45 | <p>I have a two-dimensional array of property names and values, which I need to add to a PowerShell object.</p>
<p>I have NO issues creating and displaying an object like this using <a href="http://technet.microsoft.com/en-us/library/hh849885.aspx" rel="noreferrer">New-Object</a> and <a href="https://technet.microsoft... | 109,387 | 2,277,753 | 2017-01-23 18:24:04 | 27,850,741 | 16 | 2015-01-08 22:32:46 | 3,829,407 | 2017-01-23 18:24:04 | https://stackoverflow.com/q/27846505 | https://stackoverflow.com/a/27850741 | <p>I am still not sure completely, but if you are just focusing on the <code>Add-Member</code> then consider the following.</p>
<pre><code>$fieldsarray = "ID", "ContentTypeID", "ContentType", "Title", "Modified"
$itemki = "1", "0x0108007345CD807822EA4E85691E5C642F3A27", "", "Task0", "11/24/2014 12:29:30 PM"
$itemobj =... | <p>I am still not sure completely, but if you are just focusing on the <code>Add-Member</code> then consider the following.</p> <pre><code>$fieldsarray = "ID", "ContentTypeID", "ContentType", "Title", "Modified" $itemki = "1", "0x0108007345CD807822EA4E85691E5C642F3A27", "", "Task0", "11/24/2014 12:29:30 PM" $itemobj =... | 526, 4898, 6981, 22864 | object, powershell, powershell-ise, properties | <h1>How to add properties to a PowerShell object from an array</h1>
<p>I have a two-dimensional array of property names and values, which I need to add to a PowerShell object.</p>
<p>I have NO issues creating and displaying an object like this using <a href="http://technet.microsoft.com/en-us/library/hh849885.aspx" re... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,724 | bash | # How to add properties to a PowerShell object from an array
I have a two-dimensional array of property names and values, which I need to add to a PowerShell object.
I have NO issues creating and displaying an object like this using [New-Object](http://technet.microsoft.com/en-us/library/hh849885.aspx) and [Add-Membe... | I am still not sure completely, but if you are just focusing on the `Add-Member` then consider the following.
```
$fieldsarray = "ID", "ContentTypeID", "ContentType", "Title", "Modified"
$itemki = "1", "0x0108007345CD807822EA4E85691E5C642F3A27", "", "Task0", "11/24/2014 12:29:30 PM"
$itemobj = New-Object pscustomobjec... |
24806598 | copying last bash command into clipboard | 15 | 2014-07-17 14:41:26 | <p>Sometimes I need to save the last typed shell command into the clipboard.
I can do something like this:</p>
<pre><code>echo !! | xsel --clipboard
</code></pre>
<p>Which works successfully.</p>
<p>But when I try to alias the above command:</p>
<pre><code>alias echoxs='echo !! | xsel --clipboard'
</code></pre>
<p>Thin... | 7,017 | 1,941,755 | 2024-07-13 20:53:17 | 24,807,390 | 16 | 2014-07-17 15:13:25 | 2,679,935 | 2014-07-17 15:13:25 | https://stackoverflow.com/q/24806598 | https://stackoverflow.com/a/24807390 | <p>I'm not sure to understand what you said about "failing when attempting to modify the output of history", so I hope my solution will suit you. I'm using <code>fc</code> to get the last command:</p>
<pre><code>fc -ln -1 | xsel --clipboard
</code></pre>
<p>Here are the meaning of the options:</p>
<ul>
<li><code>l</... | <p>I'm not sure to understand what you said about "failing when attempting to modify the output of history", so I hope my solution will suit you. I'm using <code>fc</code> to get the last command:</p> <pre><code>fc -ln -1 | xsel --clipboard </code></pre> <p>Here are the meaning of the options:</p> <ul> <li><code>l</... | 387, 390, 1318 | bash, history, shell | <h1>copying last bash command into clipboard</h1>
<p>Sometimes I need to save the last typed shell command into the clipboard.
I can do something like this:</p>
<pre><code>echo !! | xsel --clipboard
</code></pre>
<p>Which works successfully.</p>
<p>But when I try to alias the above command:</p>
<pre><code>alias echoxs=... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,725 | bash | # copying last bash command into clipboard
Sometimes I need to save the last typed shell command into the clipboard.
I can do something like this:
```
echo !! | xsel --clipboard
```
Which works successfully.
But when I try to alias the above command:
```
alias echoxs='echo !! | xsel --clipboard'
```
Things do not... | I'm not sure to understand what you said about "failing when attempting to modify the output of history", so I hope my solution will suit you. I'm using `fc` to get the last command:
```
fc -ln -1 | xsel --clipboard
```
Here are the meaning of the options:
- `l` is to use the standard output
- `n` is to hide the com... |
17365784 | how to silently disable xtrace in a shell script? | 15 | 2013-06-28 13:25:30 | <p>I'm writing a shell script that loops over some values and run a long command line for each value. I'd like to print out these commands along the way, just like <code>make</code> does when running a makefile. I know I could just "echo" all commands before running them, but it feels inelegant. So I'm looking at <code... | 7,810 | 117,814 | 2023-06-19 13:42:16 | 17,366,594 | 16 | 2013-06-28 14:06:32 | 14,122 | 2013-06-28 14:29:51 | https://stackoverflow.com/q/17365784 | https://stackoverflow.com/a/17366594 | <p>Sandbox it in a subshell:</p>
<pre><code>(set -x; do_thing_you_want_traced)
</code></pre>
<p>Of course, changes to variables or the environment made in that subshell will be lost.</p>
<p>If you REALLY care about this, you could also use a DEBUG trap (using <code>set -T</code> to cause it to be inherited by functi... | <p>Sandbox it in a subshell:</p> <pre><code>(set -x; do_thing_you_want_traced) </code></pre> <p>Of course, changes to variables or the environment made in that subshell will be lost.</p> <p>If you REALLY care about this, you could also use a DEBUG trap (using <code>set -T</code> to cause it to be inherited by functi... | 390 | shell | <h1>how to silently disable xtrace in a shell script?</h1>
<p>I'm writing a shell script that loops over some values and run a long command line for each value. I'd like to print out these commands along the way, just like <code>make</code> does when running a makefile. I know I could just "echo" all commands before ru... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,726 | bash | # how to silently disable xtrace in a shell script?
I'm writing a shell script that loops over some values and run a long command line for each value. I'd like to print out these commands along the way, just like `make` does when running a makefile. I know I could just "echo" all commands before running them, but it f... | Sandbox it in a subshell:
```
(set -x; do_thing_you_want_traced)
```
Of course, changes to variables or the environment made in that subshell will be lost.
If you REALLY care about this, you could also use a DEBUG trap (using `set -T` to cause it to be inherited by functions) to implement your own `set -x` equivalen... |
14193207 | Registering custom shell function in system (OSX) | 15 | 2013-01-07 09:35:11 | <p>today I wanted to write a function which will deploy my blog page (developed in nanoc) to github pages automatically - here's the script:</p>
<pre><code>function cmit()
{
nanoc compile;
git add .;
git commit -am $1;
git push origin source;
cd output; git add .;
git commit -am $1;
git push origin maste... | 16,127 | 1,004,946 | 2013-01-07 09:47:50 | 14,193,272 | 16 | 2013-01-07 09:40:02 | 1,066,031 | 2013-01-07 09:47:50 | https://stackoverflow.com/q/14193207 | https://stackoverflow.com/a/14193272 | <p>Just added it to the bottom of your <code>~/.bashrc</code> file then you will be able to use <code>cmit</code> like a regular command, you will need to refresh your current shell to pick up the changes so run <code>source ~/.bashrc</code>. If you have the function saved in a file <code>cmit</code> just do <code>cat ... | <p>Just added it to the bottom of your <code>~/.bashrc</code> file then you will be able to use <code>cmit</code> like a regular command, you will need to refresh your current shell to pick up the changes so run <code>source ~/.bashrc</code>. If you have the function saved in a file <code>cmit</code> just do <code>cat ... | 387, 390, 5569 | bash, function, shell | <h1>Registering custom shell function in system (OSX)</h1>
<p>today I wanted to write a function which will deploy my blog page (developed in nanoc) to github pages automatically - here's the script:</p>
<pre><code>function cmit()
{
nanoc compile;
git add .;
git commit -am $1;
git push origin source;
cd outp... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,727 | bash | # Registering custom shell function in system (OSX)
today I wanted to write a function which will deploy my blog page (developed in nanoc) to github pages automatically - here's the script:
```
function cmit()
{
nanoc compile;
git add .;
git commit -am $1;
git push origin source;
cd output; git add .;
git... | Just added it to the bottom of your `~/.bashrc` file then you will be able to use `cmit` like a regular command, you will need to refresh your current shell to pick up the changes so run `source ~/.bashrc`. If you have the function saved in a file `cmit` just do `cat cmit >> ~/.bashrc` to append the function to the end... |
13602751 | git - checkout single file under bare repository | 15 | 2012-11-28 10:19:46 | <p>On the server I have bare repository which is origin for development process and to simplify deployment to QA environment.</p>
<p>So in <code>post-receive</code> it simply does</p>
<pre><code>GIT_WORK_TREE=/home/dev git checkout -f
</code></pre>
<p>But as product gets more complicated there are some other things ... | 6,717 | 1,297,136 | 2018-03-05 03:48:45 | 13,603,029 | 16 | 2012-11-28 10:35:25 | 6,309 | 2012-11-28 13:23:24 | https://stackoverflow.com/q/13602751 | https://stackoverflow.com/a/13603029 | <p>As I explain in "<a href="https://stackoverflow.com/a/2467629/6309">checkout only one file from git</a>", you cannot checkout just one file without cloning or fetching first. </p>
<p>But you <a href="https://stackoverflow.com/questions/610208/how-to-retrieve-a-single-file-from-specific-revision-in-git"><code>git s... | <p>As I explain in "<a href="https://stackoverflow.com/a/2467629/6309">checkout only one file from git</a>", you cannot checkout just one file without cloning or fetching first. </p> <p>But you <a href="https://stackoverflow.com/questions/610208/how-to-retrieve-a-single-file-from-specific-revision-in-git"><code>git s... | 119, 10327, 43087 | git, githooks, sh | <h1>git - checkout single file under bare repository</h1>
<p>On the server I have bare repository which is origin for development process and to simplify deployment to QA environment.</p>
<p>So in <code>post-receive</code> it simply does</p>
<pre><code>GIT_WORK_TREE=/home/dev git checkout -f
</code></pre>
<p>But as ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,728 | bash | # git - checkout single file under bare repository
On the server I have bare repository which is origin for development process and to simplify deployment to QA environment.
So in `post-receive` it simply does
```
GIT_WORK_TREE=/home/dev git checkout -f
```
But as product gets more complicated there are some other ... | As I explain in "[checkout only one file from git](https://stackoverflow.com/a/2467629/6309)", you cannot checkout just one file without cloning or fetching first.
But you [`git show` that file](https://stackoverflow.com/questions/610208/how-to-retrieve-a-single-file-from-specific-revision-in-git), which means you can... |
9851005 | How do you clone ( duplicate ) a MongoDB object in a collection of the same db? | 15 | 2012-03-24 10:33:46 | <p>I need to duplicate (clone) an object in the collection via dbshell. Having something like this :</p>
<pre><code>> db.users.distinct( 'nickname' )
[
"user1",
"user2",
"user3",
"user4"
]
>
</code></pre>
<p>where user1 select a complex object in <strong>users</strong> collection... | 15,099 | 467,255 | 2017-07-08 07:58:59 | 9,852,223 | 16 | 2012-03-24 13:43:04 | 396,862 | 2014-04-22 14:22:53 | https://stackoverflow.com/q/9851005 | https://stackoverflow.com/a/9852223 | <p><strong>Code</strong> </p>
<pre><code>> user = db.users.findOne({'nickname': 'user1'})
> user.nickname = 'userX'
> delete user['_id']
> db.users.insert(user)
</code></pre>
<p><strong>Description</strong></p>
<p>You need to find user object and put it into the variable. Than you need to modify the prop... | <p><strong>Code</strong> </p> <pre><code>> user = db.users.findOne({'nickname': 'user1'}) > user.nickname = 'userX' > delete user['_id'] > db.users.insert(user) </code></pre> <p><strong>Description</strong></p> <p>You need to find user object and put it into the variable. Than you need to modify the prop... | 30, 390, 30073, 35037 | database, mongodb, nosql, shell | <h1>How do you clone ( duplicate ) a MongoDB object in a collection of the same db?</h1>
<p>I need to duplicate (clone) an object in the collection via dbshell. Having something like this :</p>
<pre><code>> db.users.distinct( 'nickname' )
[
"user1",
"user2",
"user3",
"user4"
]
>
<... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,729 | bash | # How do you clone ( duplicate ) a MongoDB object in a collection of the same db?
I need to duplicate (clone) an object in the collection via dbshell. Having something like this :
```
> db.users.distinct( 'nickname' )
[
"user1",
"user2",
"user3",
"user4"
]
>
```
where user1 select a c... | **Code**
```
> user = db.users.findOne({'nickname': 'user1'})
> user.nickname = 'userX'
> delete user['_id']
> db.users.insert(user)
```
**Description**
You need to find user object and put it into the variable. Than you need to modify the property you want and than you need to insert the whole object as new one. To... |
8973577 | Commandline syntax to prevent wrapping in PowerShell output file? | 15 | 2012-01-23 14:55:54 | <p>The following command wraps the output to the width of the window from which the script was called. That is, the output file is "word"-wrapped. How can I prevent this wrapping in the output file w/o modifying the script?</p>
<pre><code>PS C:\Users\User1> & '\\fileServer\c$\PowerShell Scripts\herScript.ps1' &... | 27,502 | 116,895 | 2016-02-17 16:48:06 | 8,973,693 | 16 | 2012-01-23 15:05:02 | 520,612 | 2012-01-23 15:05:02 | https://stackoverflow.com/q/8973577 | https://stackoverflow.com/a/8973693 | <p>Try this (I can't test it)</p>
<pre><code>& '\\fileServer\c$\PowerShell Scripts\herScript.ps1' | out-string -width 4096 | out-file c:\output.txt
</code></pre>
| <p>Try this (I can't test it)</p> <pre><code>& '\\fileServer\c$\PowerShell Scripts\herScript.ps1' | out-string -width 4096 | out-file c:\output.txt </code></pre> | 526, 1231, 19508, 31901, 34595 | command-line, http-redirect, powershell, windows-7, word-wrap | <h1>Commandline syntax to prevent wrapping in PowerShell output file?</h1>
<p>The following command wraps the output to the width of the window from which the script was called. That is, the output file is "word"-wrapped. How can I prevent this wrapping in the output file w/o modifying the script?</p>
<pre><code>PS C:... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,730 | bash | # Commandline syntax to prevent wrapping in PowerShell output file?
The following command wraps the output to the width of the window from which the script was called. That is, the output file is "word"-wrapped. How can I prevent this wrapping in the output file w/o modifying the script?
```
PS C:\Users\User1> & '\\f... | Try this (I can't test it)
```
& '\\fileServer\c$\PowerShell Scripts\herScript.ps1' | out-string -width 4096 | out-file c:\output.txt
``` |
3643436 | bash script to extract ALL matches of a regex pattern | 15 | 2010-09-04 18:16:20 | <p>I found this but it assumes the words are space separated.</p>
<pre><code>result="abcdefADDNAME25abcdefgHELLOabcdefgADDNAME25abcdefgHELLOabcdefg"
for word in $result
do
if echo $word | grep -qi '(ADDNAME\d\d.*HELLO)'
then
match="$match $word"
fi
done
</code></pre>
<p>POST EDITED</p>
<p>Re-nam... | 30,585 | 311,362 | 2025-09-03 09:20:27 | 3,643,504 | 16 | 2010-09-04 18:37:25 | 26,428 | 2020-08-04 07:43:39 | https://stackoverflow.com/q/3643436 | https://stackoverflow.com/a/3643504 | <p><strong>Edit: answer to edited question:</strong></p>
<pre class="lang-sh prettyprint-override"><code>for string in "$(echo $result | grep -Po "ADDNAME[0-9]{2}.*?HELLO")"; do
match="${match:+$match }$string"
done
</code></pre>
<p><strong>Original answer:</strong></p>
<p>If you're usin... | <p><strong>Edit: answer to edited question:</strong></p> <pre class="lang-sh prettyprint-override"><code>for string in "$(echo $result | grep -Po "ADDNAME[0-9]{2}.*?HELLO")"; do match="${match:+$match }$string" done </code></pre> <p><strong>Original answer:</strong></p> <p>If you're usin... | 387, 390 | bash, shell | <h1>bash script to extract ALL matches of a regex pattern</h1>
<p>I found this but it assumes the words are space separated.</p>
<pre><code>result="abcdefADDNAME25abcdefgHELLOabcdefgADDNAME25abcdefgHELLOabcdefg"
for word in $result
do
if echo $word | grep -qi '(ADDNAME\d\d.*HELLO)'
then
match="$match ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,731 | bash | # bash script to extract ALL matches of a regex pattern
I found this but it assumes the words are space separated.
```
result="abcdefADDNAME25abcdefgHELLOabcdefgADDNAME25abcdefgHELLOabcdefg"
for word in $result
do
if echo $word | grep -qi '(ADDNAME\d\d.*HELLO)'
then
match="$match $word"
fi
done
`... | **Edit: answer to edited question:**
```
for string in "$(echo $result | grep -Po "ADDNAME[0-9]{2}.*?HELLO")"; do
match="${match:+$match }$string"
done
```
**Original answer:**
If you're using Bash version 3.2 or higher, you can use its regex matching.
```
string="string to search 99 with 88 some 42 numbers"
patt... |
3348614 | How to flush a pipe using bash | 15 | 2010-07-27 22:43:35 | <p>I have a script that writes to a named pipe and another that reads from the pipe. Occasionally, when starting the script I have noticed that the contents of the pipe exist from a previous run of the script. Is there a way to flush out the pipe at the beginning of the script?</p>
| 15,859 | 125,380 | 2025-02-26 19:58:48 | 3,348,779 | 16 | 2010-07-27 23:26:00 | 371,793 | 2010-07-27 23:26:00 | https://stackoverflow.com/q/3348614 | https://stackoverflow.com/a/3348779 | <p>I think <code>dd</code> is your friend:</p>
<pre><code>dd if=myfifo iflag=nonblock of=/dev/null
</code></pre>
<p>strace shows</p>
<pre><code>open("myfifo", O_RDONLY|O_NONBLOCK)
</code></pre>
<p>and indeed doesn't even block on an empty fifo.</p>
| <p>I think <code>dd</code> is your friend:</p> <pre><code>dd if=myfifo iflag=nonblock of=/dev/null </code></pre> <p>strace shows</p> <pre><code>open("myfifo", O_RDONLY|O_NONBLOCK) </code></pre> <p>and indeed doesn't even block on an empty fifo.</p> | 387, 11366 | bash, named-pipes | <h1>How to flush a pipe using bash</h1>
<p>I have a script that writes to a named pipe and another that reads from the pipe. Occasionally, when starting the script I have noticed that the contents of the pipe exist from a previous run of the script. Is there a way to flush out the pipe at the beginning of the script?... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,732 | bash | # How to flush a pipe using bash
I have a script that writes to a named pipe and another that reads from the pipe. Occasionally, when starting the script I have noticed that the contents of the pipe exist from a previous run of the script. Is there a way to flush out the pipe at the beginning of the script? | I think `dd` is your friend:
```
dd if=myfifo iflag=nonblock of=/dev/null
```
strace shows
```
open("myfifo", O_RDONLY|O_NONBLOCK)
```
and indeed doesn't even block on an empty fifo. |
3297884 | Using output of previous commands in bash | 15 | 2010-07-21 09:30:56 | <p>In Mathematica, it is possible to reuse the output of the previous command by using %.</p>
<p>Is something similar possible for bash (or some other shell)?</p>
<p>For example, I run a make which gives warnings, but I want to find all warnings.
So, I type </p>
<pre><code>make | grep "warning"
</code></pre>
<p>but... | 22,139 | 390,321 | 2019-11-29 23:11:48 | 3,297,911 | 16 | 2010-07-21 09:35:44 | 172,211 | 2010-07-21 09:35:44 | https://stackoverflow.com/q/3297884 | https://stackoverflow.com/a/3297911 | <p>Since the amount of output is indeterminate, it doesn't make sense for <code>bash</code> to store it for you for re-display. But there's an alternate solution to your problem:</p>
<p>The <code>tee</code> command allows you to duplicate an output stream to a file. So if you're willing to use a file for temporary sto... | <p>Since the amount of output is indeterminate, it doesn't make sense for <code>bash</code> to store it for you for re-display. But there's an alternate solution to your problem:</p> <p>The <code>tee</code> command allows you to duplicate an output stream to a file. So if you're willing to use a file for temporary sto... | 58, 387, 390 | bash, linux, shell | <h1>Using output of previous commands in bash</h1>
<p>In Mathematica, it is possible to reuse the output of the previous command by using %.</p>
<p>Is something similar possible for bash (or some other shell)?</p>
<p>For example, I run a make which gives warnings, but I want to find all warnings.
So, I type </p>
<pr... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,733 | bash | # Using output of previous commands in bash
In Mathematica, it is possible to reuse the output of the previous command by using %.
Is something similar possible for bash (or some other shell)?
For example, I run a make which gives warnings, but I want to find all warnings.
So, I type
```
make | grep "warning"
```
... | Since the amount of output is indeterminate, it doesn't make sense for `bash` to store it for you for re-display. But there's an alternate solution to your problem:
The `tee` command allows you to duplicate an output stream to a file. So if you're willing to use a file for temporary storage, you can do something like ... |
2162914 | Why do I have to press Ctrl+D twice to close stdin? | 15 | 2010-01-29 15:27:55 | <p>I have the following Python script that reads numbers and outputs an error if the input is not a number.</p>
<pre><code>import fileinput
import sys
for line in (txt.strip() for txt in fileinput.input()):
if not line.isdigit():
sys.stderr.write("ERROR: not a number: %s\n" % line)
</code></pre>
<p>If I g... | 7,914 | 46,821 | 2015-02-11 01:21:03 | 2,164,353 | 16 | 2010-01-29 18:52:52 | 94,977 | 2015-02-11 01:21:03 | https://stackoverflow.com/q/2162914 | https://stackoverflow.com/a/2164353 | <p>In Python 3, this was due to <a href="http://bugs.python.org/issue5505" rel="noreferrer">a bug in Python's standard I/O library</a>. The bug was fixed in Python 3.3.</p>
<hr>
<p>In a Unix terminal, typing Ctrl+D doesn't actually close the process's stdin. But typing either Enter or Ctrl+D does cause the OS <code>r... | <p>In Python 3, this was due to <a href="http://bugs.python.org/issue5505" rel="noreferrer">a bug in Python's standard I/O library</a>. The bug was fixed in Python 3.3.</p> <hr> <p>In a Unix terminal, typing Ctrl+D doesn't actually close the process's stdin. But typing either Enter or Ctrl+D does cause the OS <code>r... | 16, 387, 1701 | bash, python, stdin | <h1>Why do I have to press Ctrl+D twice to close stdin?</h1>
<p>I have the following Python script that reads numbers and outputs an error if the input is not a number.</p>
<pre><code>import fileinput
import sys
for line in (txt.strip() for txt in fileinput.input()):
if not line.isdigit():
sys.stderr.write... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,734 | bash | # Why do I have to press Ctrl+D twice to close stdin?
I have the following Python script that reads numbers and outputs an error if the input is not a number.
```
import fileinput
import sys
for line in (txt.strip() for txt in fileinput.input()):
if not line.isdigit():
sys.stderr.write("ERROR: not a numbe... | In Python 3, this was due to [a bug in Python's standard I/O library](http://bugs.python.org/issue5505). The bug was fixed in Python 3.3.
---
In a Unix terminal, typing Ctrl+D doesn't actually close the process's stdin. But typing either Enter or Ctrl+D does cause the OS `read` system call to return right away. So:
... |
55473913 | Write-Verbose vs Write-Host in powershell | 14 | 2019-04-02 11:39:27 | <p>While I am using <code>Write-Verbose</code> in powershell command window I'm not getting anything in the console. However it is used by devops engineers in my team for continuous integration, build scripts.</p>
<p>What is the difference between <code>Write-Verbose</code> and <code>Write-Host</code></p>
| 24,024 | 7,441,056 | 2020-04-20 12:05:56 | 55,474,264 | 16 | 2019-04-02 11:59:26 | 8,188,846 | 2019-04-02 15:51:26 | https://stackoverflow.com/q/55473913 | https://stackoverflow.com/a/55474264 | <p>The difference between the cmdlets (as of <a href="/questions/tagged/powershell-v5.0" class="post-tag" title="show questions tagged 'powershell-v5.0'" rel="tag">powershell-v5.0</a>) is which stream they use to display information. By default, the Verbose stream (4) is not visible <em>unless</em> you specify... | <p>The difference between the cmdlets (as of <a href="/questions/tagged/powershell-v5.0" class="post-tag" title="show questions tagged 'powershell-v5.0'" rel="tag">powershell-v5.0</a>) is which stream they use to display information. By default, the Verbose stream (4) is not visible <em>unless</em> you specify... | 526, 73157 | powershell, powershell-3.0 | <h1>Write-Verbose vs Write-Host in powershell</h1>
<p>While I am using <code>Write-Verbose</code> in powershell command window I'm not getting anything in the console. However it is used by devops engineers in my team for continuous integration, build scripts.</p>
<p>What is the difference between <code>Write-Verbose<... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,735 | bash | # Write-Verbose vs Write-Host in powershell
While I am using `Write-Verbose` in powershell command window I'm not getting anything in the console. However it is used by devops engineers in my team for continuous integration, build scripts.
What is the difference between `Write-Verbose` and `Write-Host` | The difference between the cmdlets (as of [powershell-v5.0](/questions/tagged/powershell-v5.0 "show questions tagged 'powershell-v5.0'")) is which stream they use to display information. By default, the Verbose stream (4) is not visible *unless* you specify `-Verbose`, add `-Verbose` using the `$PSDefaultParameterValue... |
51301508 | Is there a way to know how the user invoked a program from bash? | 14 | 2018-07-12 09:07:47 | <p>Here's the problem: I have this script <code>foo.py</code>, and if the user invokes it without the <code>--bar</code> option, I'd like to display the following error message:</p>
<pre><code>Please add the --bar option to your command, like so:
python foo.py --bar
</code></pre>
<p>Now, the tricky part is that t... | 783 | 7,581 | 2018-12-20 18:27:14 | 51,411,924 | 16 | 2018-07-18 22:36:42 | 14,122 | 2018-07-19 16:55:00 | https://stackoverflow.com/q/51301508 | https://stackoverflow.com/a/51411924 | <h3>No, there is no way to see the original text (before aliases/functions/etc).</h3>
<p>Starting a program in UNIX is done as follows at the underlying syscall level:</p>
<pre><code>int execve(const char *path, char *const argv[], char *const envp[]);
</code></pre>
<p>Notably, there are three arguments:</p>
<ul>
<... | <h3>No, there is no way to see the original text (before aliases/functions/etc).</h3> <p>Starting a program in UNIX is done as follows at the underlying syscall level:</p> <pre><code>int execve(const char *path, char *const argv[], char *const envp[]); </code></pre> <p>Notably, there are three arguments:</p> <ul> <... | 58, 387, 11225 | bash, command-line-interface, linux | <h1>Is there a way to know how the user invoked a program from bash?</h1>
<p>Here's the problem: I have this script <code>foo.py</code>, and if the user invokes it without the <code>--bar</code> option, I'd like to display the following error message:</p>
<pre><code>Please add the --bar option to your command, like so... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,736 | bash | # Is there a way to know how the user invoked a program from bash?
Here's the problem: I have this script `foo.py`, and if the user invokes it without the `--bar` option, I'd like to display the following error message:
```
Please add the --bar option to your command, like so:
python foo.py --bar
```
Now, the tr... | ### No, there is no way to see the original text (before aliases/functions/etc).
Starting a program in UNIX is done as follows at the underlying syscall level:
```
int execve(const char *path, char *const argv[], char *const envp[]);
```
Notably, there are three arguments:
- The path to the executable
- An argv arr... |
42963661 | Use PowerShell to search for string in registry keys and values | 14 | 2017-03-22 22:15:07 | <p>I'd like to use PowerShell to find all registry keys and values within a particular hive that contain a string <code>foo</code>, possibly embedded within a longer string. Finding the keys is not hard:</p>
<pre><code>Get-ChildItem -path hkcu:\ -recurse -ErrorAction SilentlyContinue | Where-Object {$_.Name -like "*fo... | 119,229 | 523,124 | 2025-05-27 08:26:44 | 42,965,635 | 16 | 2017-03-23 01:29:54 | 3,874,447 | 2025-05-27 08:26:44 | https://stackoverflow.com/q/42963661 | https://stackoverflow.com/a/42965635 | <p>Each key has a <code>GetValueNames()</code>, <code>GetValueKind()</code>, and <code>GetValue()</code> method that let you enumerate child values. You can also use the <code>GetSubKeyNames()</code> instead of depending on <code>Get-ChildItem -Recurse</code> to enumerate keys.</p>
<p>To answer your question about sear... | <p>Each key has a <code>GetValueNames()</code>, <code>GetValueKind()</code>, and <code>GetValue()</code> method that let you enumerate child values. You can also use the <code>GetSubKeyNames()</code> instead of depending on <code>Get-ChildItem -Recurse</code> to enumerate keys.</p> <p>To answer your question about sear... | 526 | powershell | <h1>Use PowerShell to search for string in registry keys and values</h1>
<p>I'd like to use PowerShell to find all registry keys and values within a particular hive that contain a string <code>foo</code>, possibly embedded within a longer string. Finding the keys is not hard:</p>
<pre><code>Get-ChildItem -path hkcu:\ ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,737 | bash | # Use PowerShell to search for string in registry keys and values
I'd like to use PowerShell to find all registry keys and values within a particular hive that contain a string `foo`, possibly embedded within a longer string. Finding the keys is not hard:
```
Get-ChildItem -path hkcu:\ -recurse -ErrorAction SilentlyC... | Each key has a `GetValueNames()`, `GetValueKind()`, and `GetValue()` method that let you enumerate child values. You can also use the `GetSubKeyNames()` instead of depending on `Get-ChildItem -Recurse` to enumerate keys.
To answer your question about searching multiple hives: if you start with `Get-ChildItem Registry:... |
38178112 | Can I add changes to staging area from another branch? | 14 | 2016-07-04 06:27:53 | <p>I have two branch,</p>
<ul>
<li>master</li>
<li>new-features</li>
</ul>
<p>New features have a commit I want to add to master but I want the control how much I want to merge.</p>
<p>I would like the option to add/reject changes for each line. Similar I can do with <code>git add -p</code> </p>
<p>I have searched ... | 6,286 | 550,907 | 2016-12-03 19:00:12 | 38,178,762 | 16 | 2016-07-04 07:09:44 | 6,394,138 | 2016-07-04 07:17:14 | https://stackoverflow.com/q/38178112 | https://stackoverflow.com/a/38178762 | <p>Use <code>git cherry-pick</code> with the <code>-n|--no-commit</code> option and then interactively select what to commit:</p>
<blockquote>
<p><strong>git cherry-pick</strong></p>
<p>...</p>
<p><code>-n</code>, <code>--no-commit</code></p>
<p>Usually <code>git cherry-pick</code> automatically creat... | <p>Use <code>git cherry-pick</code> with the <code>-n|--no-commit</code> option and then interactively select what to commit:</p> <blockquote> <p><strong>git cherry-pick</strong></p> <p>...</p> <p><code>-n</code>, <code>--no-commit</code></p> <p>Usually <code>git cherry-pick</code> automatically creat... | 119, 390, 456, 3346 | dvcs, git, shell, version-control | <h1>Can I add changes to staging area from another branch?</h1>
<p>I have two branch,</p>
<ul>
<li>master</li>
<li>new-features</li>
</ul>
<p>New features have a commit I want to add to master but I want the control how much I want to merge.</p>
<p>I would like the option to add/reject changes for each line. Similar... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,738 | bash | # Can I add changes to staging area from another branch?
I have two branch,
- master
- new-features
New features have a commit I want to add to master but I want the control how much I want to merge.
I would like the option to add/reject changes for each line. Similar I can do with `git add -p`
I have searched a l... | Use `git cherry-pick` with the `-n|--no-commit` option and then interactively select what to commit:
> **git cherry-pick**
>
> ...
>
> `-n`, `--no-commit`
>
> Usually `git cherry-pick` automatically creates a sequence of commits. This
> flag applies the changes necessary to cherry-pick each named commit to your
> work... |
37838273 | Evaluating bash "&&" exit codes behaviour | 14 | 2016-06-15 14:26:58 | <p>We had a recent experience with bash that even we found a solution, it keeps twisting my mind. How does bash evaluates the <code>&&</code> expression in terms of return codes?</p>
<p>Executing this script, that should fail because <code>myrandomcommand</code> does not exist:</p>
<pre><code>#!/bin/bash
set... | 3,904 | 60,511 | 2016-06-15 14:40:09 | 37,838,575 | 16 | 2016-06-15 14:40:09 | 2,545,194 | 2016-06-15 14:40:09 | https://stackoverflow.com/q/37838273 | https://stackoverflow.com/a/37838575 | <p>You can read in the man pages of <strong>bash</strong>:</p>
<pre><code>-e Exit immediately if a simple command (see SHELL GRAMMAR above) exits with a
non-zero status. The shell does not exit if the command that fails is part of the
command list immediately following a while or until keyword, part of th... | <p>You can read in the man pages of <strong>bash</strong>:</p> <pre><code>-e Exit immediately if a simple command (see SHELL GRAMMAR above) exits with a non-zero status. The shell does not exit if the command that fails is part of the command list immediately following a while or until keyword, part of th... | 387, 4705, 9206 | bash, return, return-value | <h1>Evaluating bash "&&" exit codes behaviour</h1>
<p>We had a recent experience with bash that even we found a solution, it keeps twisting my mind. How does bash evaluates the <code>&&</code> expression in terms of return codes?</p>
<p>Executing this script, that should fail because <code>myrandomcommand</cod... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,739 | bash | # Evaluating bash "&&" exit codes behaviour
We had a recent experience with bash that even we found a solution, it keeps twisting my mind. How does bash evaluates the `&&` expression in terms of return codes?
Executing this script, that should fail because `myrandomcommand` does not exist:
```
#!/bin/bash
set -e
e... | You can read in the man pages of **bash**:
```
-e Exit immediately if a simple command (see SHELL GRAMMAR above) exits with a
non-zero status. The shell does not exit if the command that fails is part of the
command list immediately following a while or until keyword, part of the test in
an if statem... |
28865473 | Setting environment variable to a large value -> "Argument list too long" | 14 | 2015-03-04 21:36:09 | <p>Inside a bash script, I set an environment variable to contain a string of 1 million characters. I do so like this:</p>
<pre><code>export LG=XXXXXXX # ... 1 million X's
</code></pre>
<p>Immediately after this, I am able to echo it back without a problem, i.e.</p>
<pre><code>echo $LG
</code></pre>
<p>However, any... | 10,250 | 1,420,590 | 2015-03-04 22:10:15 | 28,865,503 | 16 | 2015-03-04 21:37:40 | 14,122 | 2015-03-04 22:10:15 | https://stackoverflow.com/q/28865473 | https://stackoverflow.com/a/28865503 | <p>Command-line arguments and environment variables both come out of the same pool of space. Set environment variables too long, and you no longer have space for command-line arguments -- and even <code>xargs</code>, which breaks command line invocations down into smaller groupings to fit inside the pool where possible... | <p>Command-line arguments and environment variables both come out of the same pool of space. Set environment variables too long, and you no longer have space for command-line arguments -- and even <code>xargs</code>, which breaks command line invocations down into smaller groupings to fit inside the pool where possible... | 58, 387, 390, 9013 | bash, environment-variables, linux, shell | <h1>Setting environment variable to a large value -> "Argument list too long"</h1>
<p>Inside a bash script, I set an environment variable to contain a string of 1 million characters. I do so like this:</p>
<pre><code>export LG=XXXXXXX # ... 1 million X's
</code></pre>
<p>Immediately after this, I am able to echo it b... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,740 | bash | # Setting environment variable to a large value -> "Argument list too long"
Inside a bash script, I set an environment variable to contain a string of 1 million characters. I do so like this:
```
export LG=XXXXXXX # ... 1 million X's
```
Immediately after this, I am able to echo it back without a problem, i.e.
```
... | Command-line arguments and environment variables both come out of the same pool of space. Set environment variables too long, and you no longer have space for command-line arguments -- and even `xargs`, which breaks command line invocations down into smaller groupings to fit inside the pool where possible, can't operat... |
21876431 | Replace text between two strings in file using linux bash | 14 | 2014-02-19 09:39:01 | <p>i have file "acl.txt"</p>
<pre><code> 192.168.0.1
192.168.4.5
#start_exceptions
192.168.3.34
192.168.6.78
#end_exceptions
192.168.5.55
</code></pre>
<p>and another file "exceptions"</p>
<pre><code> 192.168.88.88
192.168.76.6
</code></pre>
<p>I need to replace everything between #start_exceptions and #end_... | 11,247 | 1,908,352 | 2017-09-26 08:42:28 | 21,876,700 | 16 | 2014-02-19 09:48:47 | 2,836,621 | 2014-02-21 17:00:43 | https://stackoverflow.com/q/21876431 | https://stackoverflow.com/a/21876700 | <p><strong>EDITED</strong>:</p>
<p>Ok, if you want to retain the #start and #stop, I will revert to awk:</p>
<pre><code>awk '
BEGIN {p=1}
/^#start/ {print;system("cat exceptions");p=0}
/^#end/ {p=1}
p' acl.txt
</code></pre>
<p>Thanks to @fedorqui for tweaks in comments below.</p>
<p>Outp... | <p><strong>EDITED</strong>:</p> <p>Ok, if you want to retain the #start and #stop, I will revert to awk:</p> <pre><code>awk ' BEGIN {p=1} /^#start/ {print;system("cat exceptions");p=0} /^#end/ {p=1} p' acl.txt </code></pre> <p>Thanks to @fedorqui for tweaks in comments below.</p> <p>Outp... | 58, 387, 5282 | bash, linux, sed | <h1>Replace text between two strings in file using linux bash</h1>
<p>i have file "acl.txt"</p>
<pre><code> 192.168.0.1
192.168.4.5
#start_exceptions
192.168.3.34
192.168.6.78
#end_exceptions
192.168.5.55
</code></pre>
<p>and another file "exceptions"</p>
<pre><code> 192.168.88.88
192.168.76.6
</code></pre>
... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,741 | bash | # Replace text between two strings in file using linux bash
i have file "acl.txt"
```
192.168.0.1
192.168.4.5
#start_exceptions
192.168.3.34
192.168.6.78
#end_exceptions
192.168.5.55
```
and another file "exceptions"
```
192.168.88.88
192.168.76.6
```
I need to replace everything between #start_exceptions... | **EDITED**:
Ok, if you want to retain the #start and #stop, I will revert to awk:
```
awk '
BEGIN {p=1}
/^#start/ {print;system("cat exceptions");p=0}
/^#end/ {p=1}
p' acl.txt
```
Thanks to @fedorqui for tweaks in comments below.
Output:
```
192.168.0.1
192.168.4.5
#start_exceptions
192... |
18527121 | What is EOF!! in the bash script? | 14 | 2013-08-30 07:19:17 | <p>There is a command I don't understand:</p>
<pre><code>custom_command << EOF!!
</code></pre>
<p>I want to ask what EOF!! is in the bash script. I did find EOF with google, but google will ignore the "!!" automatically, so I cannot find EOF!!. </p>
<p>I know the end of the file token, but I don't exactly know... | 87,159 | 2,288,882 | 2013-08-30 07:52:36 | 18,527,367 | 16 | 2013-08-30 07:33:27 | 1,030,675 | 2013-08-30 07:50:28 | https://stackoverflow.com/q/18527121 | https://stackoverflow.com/a/18527367 | <p>On the command line, <code>!!</code> would be expanded to the last command executed. Bash will print the line for you:</p>
<pre><code>$ ls
a.txt b.txt
$ cat <<EOF!!
cat <<EOFls
>
</code></pre>
<p>In a script, though, history expansion is disabled by default, so the exclamation marks are part of the... | <p>On the command line, <code>!!</code> would be expanded to the last command executed. Bash will print the line for you:</p> <pre><code>$ ls a.txt b.txt $ cat <<EOF!! cat <<EOFls > </code></pre> <p>In a script, though, history expansion is disabled by default, so the exclamation marks are part of the... | 34, 58, 387, 390 | bash, linux, shell, unix | <h1>What is EOF!! in the bash script?</h1>
<p>There is a command I don't understand:</p>
<pre><code>custom_command << EOF!!
</code></pre>
<p>I want to ask what EOF!! is in the bash script. I did find EOF with google, but google will ignore the "!!" automatically, so I cannot find EOF!!. </p>
<p>I know the end ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,742 | bash | # What is EOF!! in the bash script?
There is a command I don't understand:
```
custom_command << EOF!!
```
I want to ask what EOF!! is in the bash script. I did find EOF with google, but google will ignore the "!!" automatically, so I cannot find EOF!!.
I know the end of the file token, but I don't exactly know wha... | On the command line, `!!` would be expanded to the last command executed. Bash will print the line for you:
```
$ ls
a.txt b.txt
$ cat <<EOF!!
cat <<EOFls
>
```
In a script, though, history expansion is disabled by default, so the exclamation marks are part of the word.
```
#! /bin/bash
ls
cat <<EOF!!
echo 1
EOFls
... |
17214038 | pipe each line of a file to a command | 14 | 2013-06-20 12:47:36 | <p>I have a text file which each line is a one word coded base64 separely. Now I want to decode it. I'm trying to use base64 command line, but I'm getting all the words in only one line, I want one per line.</p>
<p>For example, my file is:</p>
<pre><code>Y2F0Cg==
ZG9nCg==
aG91c2UK
</code></pre>
<p>I want as result:<... | 16,008 | 1,431,685 | 2023-12-27 15:52:01 | 17,214,061 | 16 | 2013-06-20 12:49:19 | 1,983,854 | 2018-08-09 07:27:53 | https://stackoverflow.com/q/17214038 | https://stackoverflow.com/a/17214061 | <p>Use <code>base64 --decode</code> together with a loop:</p>
<pre><code>$ while IFS= read -r line; do echo "$line" | base64 --decode; done < file
cat
dog
house
</code></pre>
| <p>Use <code>base64 --decode</code> together with a loop:</p> <pre><code>$ while IFS= read -r line; do echo "$line" | base64 --decode; done < file cat dog house </code></pre> | 390, 1011, 1231, 10326 | base64, command-line, shell, xargs | <h1>pipe each line of a file to a command</h1>
<p>I have a text file which each line is a one word coded base64 separely. Now I want to decode it. I'm trying to use base64 command line, but I'm getting all the words in only one line, I want one per line.</p>
<p>For example, my file is:</p>
<pre><code>Y2F0Cg==
ZG9nCg=... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,743 | bash | # pipe each line of a file to a command
I have a text file which each line is a one word coded base64 separely. Now I want to decode it. I'm trying to use base64 command line, but I'm getting all the words in only one line, I want one per line.
For example, my file is:
```
Y2F0Cg==
ZG9nCg==
aG91c2UK
```
I want as r... | Use `base64 --decode` together with a loop:
```
$ while IFS= read -r line; do echo "$line" | base64 --decode; done < file
cat
dog
house
``` |
12393999 | Using a Variable (PowerShell) inside of a command | 14 | 2012-09-12 18:11:21 | <pre><code>$computer = gc env:computername
# Argument /RU '$computer'\admin isn't working.
SchTasks /create /SC Daily /tn "Image Verification" /ST 18:00:00 /TR C:\bdr\ImageVerification\ImageVerification.exe /RU '$computer'\admin /RP password
</code></pre>
<p>Basically I need to provide the computer name in the schedu... | 39,474 | 1,231,701 | 2021-11-19 21:54:52 | 12,394,041 | 16 | 2012-09-12 18:14:27 | 153,982 | 2012-09-12 18:14:27 | https://stackoverflow.com/q/12393999 | https://stackoverflow.com/a/12394041 | <p>Single quoted strings will not expand variables in PowerShell. Try a double quoted string e.g.:</p>
<pre><code>"$computer\admin"
</code></pre>
| <p>Single quoted strings will not expand variables in PowerShell. Try a double quoted string e.g.:</p> <pre><code>"$computer\admin" </code></pre> | 276, 526, 10804, 25968 | powershell, quoting, string-interpolation, variables | <h1>Using a Variable (PowerShell) inside of a command</h1>
<pre><code>$computer = gc env:computername
# Argument /RU '$computer'\admin isn't working.
SchTasks /create /SC Daily /tn "Image Verification" /ST 18:00:00 /TR C:\bdr\ImageVerification\ImageVerification.exe /RU '$computer'\admin /RP password
</code></pre>
<p>... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,744 | bash | # Using a Variable (PowerShell) inside of a command
```
$computer = gc env:computername
# Argument /RU '$computer'\admin isn't working.
SchTasks /create /SC Daily /tn "Image Verification" /ST 18:00:00 /TR C:\bdr\ImageVerification\ImageVerification.exe /RU '$computer'\admin /RP password
```
Basically I need to provid... | Single quoted strings will not expand variables in PowerShell. Try a double quoted string e.g.:
```
"$computer\admin"
``` |
11468984 | How to give sudo access to a bash script? | 14 | 2012-07-13 10:47:22 | <p>I have a bash script (<code>chbr.sh</code>) to change my display brightness from terminal as my brightness keys doesn't work.</p>
<pre><code>sudo setpci -s 00:02.0 F4.B=30`
</code></pre>
<p>Now, every time I run that script it asks for my password, which I don't like. So, I googled a little and found out that one ca... | 30,656 | 933,999 | 2024-01-04 14:15:10 | 11,469,022 | 16 | 2012-07-13 10:50:50 | 1,458,569 | 2024-01-04 13:39:43 | https://stackoverflow.com/q/11468984 | https://stackoverflow.com/a/11469022 | <p>Your script is entirely correct, but you need to execute it with the full path:</p>
<pre><code>$ sudo /home/ronnie/chbr.sh
</code></pre>
| <p>Your script is entirely correct, but you need to execute it with the full path:</p> <pre><code>$ sudo /home/ronnie/chbr.sh </code></pre> | 387, 1674, 34284 | bash, sudo, sudoers | <h1>How to give sudo access to a bash script?</h1>
<p>I have a bash script (<code>chbr.sh</code>) to change my display brightness from terminal as my brightness keys doesn't work.</p>
<pre><code>sudo setpci -s 00:02.0 F4.B=30`
</code></pre>
<p>Now, every time I run that script it asks for my password, which I don't lik... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,745 | bash | # How to give sudo access to a bash script?
I have a bash script (`chbr.sh`) to change my display brightness from terminal as my brightness keys doesn't work.
```
sudo setpci -s 00:02.0 F4.B=30`
```
Now, every time I run that script it asks for my password, which I don't like. So, I googled a little and found out th... | Your script is entirely correct, but you need to execute it with the full path:
```
$ sudo /home/ronnie/chbr.sh
``` |
9439210 | How can I make this PowerShell script parse large files faster? | 14 | 2012-02-24 22:56:09 | <p>I have the following PowerShell script that will parse some very large file for <a href="https://en.wikipedia.org/wiki/Extract,_transform,_load" rel="nofollow noreferrer">ETL</a> purposes. For starters my test file is ~ 30 MB. Larger files around 200 MB are expected. So I have a few questions.</p>
<p>The ... | 42,595 | 652,261 | 2016-12-13 20:07:41 | 9,439,750 | 16 | 2012-02-24 23:56:32 | 574,168 | 2016-12-13 20:07:41 | https://stackoverflow.com/q/9439210 | https://stackoverflow.com/a/9439750 | <p>Your script reads one line at a time (slow!) and stores almost the entire file in memory (big!).</p>
<p>Try this (not tested extensively):</p>
<pre><code>$path = "E:\Documents\Projects\ESPS\Dev\DataFiles\DimProductionOrderOperation"
$infile = "14SEP11_ProdOrderOperations.txt"
$outfile = "PROCESSED_14SEP11_ProdOrde... | <p>Your script reads one line at a time (slow!) and stores almost the entire file in memory (big!).</p> <p>Try this (not tested extensively):</p> <pre><code>$path = "E:\Documents\Projects\ESPS\Dev\DataFiles\DimProductionOrderOperation" $infile = "14SEP11_ProdOrderOperations.txt" $outfile = "PROCESSED_14SEP11_ProdOrde... | 526 | powershell | <h1>How can I make this PowerShell script parse large files faster?</h1>
<p>I have the following PowerShell script that will parse some very large file for <a href="https://en.wikipedia.org/wiki/Extract,_transform,_load" rel="nofollow noreferrer">ETL</a> purposes. For starters my test file is ~ 30 MB. Larger files... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,746 | bash | # How can I make this PowerShell script parse large files faster?
I have the following PowerShell script that will parse some very large file for [ETL](https://en.wikipedia.org/wiki/Extract,_transform,_load) purposes. For starters my test file is ~ 30 MB. Larger files around 200 MB are expected. So I have a few questi... | Your script reads one line at a time (slow!) and stores almost the entire file in memory (big!).
Try this (not tested extensively):
```
$path = "E:\Documents\Projects\ESPS\Dev\DataFiles\DimProductionOrderOperation"
$infile = "14SEP11_ProdOrderOperations.txt"
$outfile = "PROCESSED_14SEP11_ProdOrderOperations.txt"
$ba... |
7861886 | how to get file properties? | 14 | 2011-10-22 18:58:37 | <p>I want an application which displays the some file properties of a mediafile if available, like (don't know the exact english words used in windows for it) FileName, Length/Duration, FileType(.avi .mp3 etc.)
I tried taglib and windowsapishell but I dont get a working result (references are good)</p>
<pre><code>She... | 100,440 | 1,008,817 | 2020-01-28 13:17:23 | 7,861,915 | 16 | 2011-10-22 19:02:47 | 899,271 | 2020-01-28 13:17:23 | https://stackoverflow.com/q/7861886 | https://stackoverflow.com/a/7861915 | <p>When reviewing or opening a file, to get its name, the FileInfo class is equipped with the Name property. Here is an sample code:</p>
<pre><code>FileInfo oFileInfo = new FileInfo(strFilename);
if (oFileInfo != null || oFileInfo.Length == 0)
{
MessageBox.Show("My File's Name: \"" + oFileInfo.Name + "\"");
// ... | <p>When reviewing or opening a file, to get its name, the FileInfo class is equipped with the Name property. Here is an sample code:</p> <pre><code>FileInfo oFileInfo = new FileInfo(strFilename); if (oFileInfo != null || oFileInfo.Length == 0) { MessageBox.Show("My File's Name: \"" + oFileInfo.Name + "\""); // ... | 9, 8123, 9322, 14319, 44420 | c#, getproperties, taglib, windows-api-code-pack, windows-shell | <h1>how to get file properties?</h1>
<p>I want an application which displays the some file properties of a mediafile if available, like (don't know the exact english words used in windows for it) FileName, Length/Duration, FileType(.avi .mp3 etc.)
I tried taglib and windowsapishell but I dont get a working result (ref... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,747 | bash | # how to get file properties?
I want an application which displays the some file properties of a mediafile if available, like (don't know the exact english words used in windows for it) FileName, Length/Duration, FileType(.avi .mp3 etc.)
I tried taglib and windowsapishell but I dont get a working result (references ar... | When reviewing or opening a file, to get its name, the FileInfo class is equipped with the Name property. Here is an sample code:
```
FileInfo oFileInfo = new FileInfo(strFilename);
if (oFileInfo != null || oFileInfo.Length == 0)
{
MessageBox.Show("My File's Name: \"" + oFileInfo.Name + "\"");
// For calculatin... |
6781225 | How do I check if a directory has child directories? | 14 | 2011-07-21 18:57:17 | <p>Using bash, how do I write an if statement that checks if a certain directory, stored in the a script variable named "$DIR", contains child directories that are not "." or ".."?</p>
<p>Thanks, - Dave</p>
| 22,942 | 623,658 | 2022-03-21 18:12:32 | 6,781,343 | 16 | 2011-07-21 19:07:13 | 157,770 | 2020-07-21 18:24:53 | https://stackoverflow.com/q/6781225 | https://stackoverflow.com/a/6781343 | <p>As the comments have pointed out, things have changed in the last 9 years! The dot dirs are no longer returned as part of find and instead the directory specified in the <code>find</code> command is.</p>
<p>So, if you want to stay with this approach:</p>
<pre><code>#!/bin/bash
subdircount=$(find /tmp/test -maxdepth ... | <p>As the comments have pointed out, things have changed in the last 9 years! The dot dirs are no longer returned as part of find and instead the directory specified in the <code>find</code> command is.</p> <p>So, if you want to stay with this approach:</p> <pre><code>#!/bin/bash subdircount=$(find /tmp/test -maxdepth ... | 34, 387, 531 | bash, scripting, unix | <h1>How do I check if a directory has child directories?</h1>
<p>Using bash, how do I write an if statement that checks if a certain directory, stored in the a script variable named "$DIR", contains child directories that are not "." or ".."?</p>
<p>Thanks, - Dave</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,748 | bash | # How do I check if a directory has child directories?
Using bash, how do I write an if statement that checks if a certain directory, stored in the a script variable named "$DIR", contains child directories that are not "." or ".."?
Thanks, - Dave | As the comments have pointed out, things have changed in the last 9 years! The dot dirs are no longer returned as part of find and instead the directory specified in the `find` command is.
So, if you want to stay with this approach:
```
#!/bin/bash
subdircount=$(find /tmp/test -maxdepth 1 -type d | wc -l)
if [[ "$su... |
2797974 | Testing a shellcode | 14 | 2010-05-09 14:49:17 | <p>I have this piece of code to test a shellcode but I don't understand it so can anyone explain it to me?</p>
<p>Forget about the assembly shellcode, what I want to understand is the C code,</p>
<pre><code>char shellcode[] = "...";
int main(int argc, char **argv)
{
int (*func)();
func = (int (*)()) shellcode;
... | 9,001 | 324,894 | 2014-08-19 07:31:17 | 2,798,070 | 16 | 2010-05-09 15:15:03 | 58,100 | 2010-05-09 15:15:03 | https://stackoverflow.com/q/2797974 | https://stackoverflow.com/a/2798070 | <pre><code>int (*func)();
</code></pre>
<p>This is a declaration of a function pointer. A function pointer is essentially a variable that holds the address of a function. In this case, the type of function that <code>func</code> points to is a one that takes no arguments and returns an <code>int</code>. You can assign... | <pre><code>int (*func)(); </code></pre> <p>This is a declaration of a function pointer. A function pointer is essentially a variable that holds the address of a function. In this case, the type of function that <code>func</code> points to is a one that takes no arguments and returns an <code>int</code>. You can assign... | 8, 78469 | c, shellcode | <h1>Testing a shellcode</h1>
<p>I have this piece of code to test a shellcode but I don't understand it so can anyone explain it to me?</p>
<p>Forget about the assembly shellcode, what I want to understand is the C code,</p>
<pre><code>char shellcode[] = "...";
int main(int argc, char **argv)
{
int (*func)();
fu... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,749 | bash | # Testing a shellcode
I have this piece of code to test a shellcode but I don't understand it so can anyone explain it to me?
Forget about the assembly shellcode, what I want to understand is the C code,
```
char shellcode[] = "...";
int main(int argc, char **argv)
{
int (*func)();
func = (int (*)()) shellcode;
... | ```
int (*func)();
```
This is a declaration of a function pointer. A function pointer is essentially a variable that holds the address of a function. In this case, the type of function that `func` points to is a one that takes no arguments and returns an `int`. You can assign the address of a function to this variabl... |
26123 | Accessing .NET components from Powershell | 14 | 2008-08-25 14:33:18 | <p>I want to use Powershell to write some utilities, leveraging our own .NET components to handle the actual work. This is in place of writing a small console app to tie the calls together. My question is where I would find a good source of documentation or tutorial material to help me fast track this?</p>
| 7,486 | 1,535 | 2016-11-15 13:51:52 | 26,135 | 16 | 2008-08-25 14:38:13 | 1,233 | 2015-09-25 17:33:00 | https://stackoverflow.com/q/26123 | https://stackoverflow.com/a/26135 | <p>If you want to load an assembly into your PowerShell session, you can use reflection and load the assembly.</p>
<pre><code>[void][System.Reflection.Assembly]::LoadFrom(PathToYourAssembly)
</code></pre>
<p>After you load your assembly, you can call static methods and create new instances of a class. </p>
<p>A goo... | <p>If you want to load an assembly into your PowerShell session, you can use reflection and load the assembly.</p> <pre><code>[void][System.Reflection.Assembly]::LoadFrom(PathToYourAssembly) </code></pre> <p>After you load your assembly, you can call static methods and create new instances of a class. </p> <p>A goo... | 526, 1649 | components, powershell | <h1>Accessing .NET components from Powershell</h1>
<p>I want to use Powershell to write some utilities, leveraging our own .NET components to handle the actual work. This is in place of writing a small console app to tie the calls together. My question is where I would find a good source of documentation or tutorial ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,750 | bash | # Accessing .NET components from Powershell
I want to use Powershell to write some utilities, leveraging our own .NET components to handle the actual work. This is in place of writing a small console app to tie the calls together. My question is where I would find a good source of documentation or tutorial material to... | If you want to load an assembly into your PowerShell session, you can use reflection and load the assembly.
```
[void][System.Reflection.Assembly]::LoadFrom(PathToYourAssembly)
```
After you load your assembly, you can call static methods and create new instances of a class.
A good tutorial can be found [here](http:... |
64436812 | Write-Information does not appear to work in powershell foreach-object -parallel | 13 | 2020-10-20 00:24:23 | <p>I am new to powershell and just learning it. I have some experience in C#. I am trying to use the foreach-object -Parallel option but cant get all the Write-* functions to work.</p>
<pre><code>function writeTest {
1..1 | ForEach-Object -Parallel {
Write-Host "host"
Write-O... | 6,770 | 14,481,723 | 2020-10-20 20:32:48 | 64,437,919 | 16 | 2020-10-20 03:11:21 | 45,375 | 2020-10-20 20:32:48 | https://stackoverflow.com/q/64436812 | https://stackoverflow.com/a/64437919 | <p><strong>You're seeing a <em>bug</em></strong> in <code>ForEach-Object -Parallel</code> / <code>Start-ThreadJob</code>, present up to at least PowerShell Core 7.0:</p>
<p>Your <code>Write-Information</code> output <em>should</em> show, because you've used <code>-InformationAction Continue</code> to turn it on; while ... | <p><strong>You're seeing a <em>bug</em></strong> in <code>ForEach-Object -Parallel</code> / <code>Start-ThreadJob</code>, present up to at least PowerShell Core 7.0:</p> <p>Your <code>Write-Information</code> output <em>should</em> show, because you've used <code>-InformationAction Continue</code> to turn it on; while ... | 353, 526, 84917, 136520, 144089 | foreach-object, output, parallel-processing, powershell, powershell-7.0 | <h1>Write-Information does not appear to work in powershell foreach-object -parallel</h1>
<p>I am new to powershell and just learning it. I have some experience in C#. I am trying to use the foreach-object -Parallel option but cant get all the Write-* functions to work.</p>
<pre><code>function writeTest {
1..... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,751 | bash | # Write-Information does not appear to work in powershell foreach-object -parallel
I am new to powershell and just learning it. I have some experience in C#. I am trying to use the foreach-object -Parallel option but cant get all the Write-* functions to work.
```
function writeTest {
1..1 | ForEach-Object -P... | **You're seeing a *bug*** in `ForEach-Object -Parallel` / `Start-ThreadJob`, present up to at least PowerShell Core 7.0:
Your `Write-Information` output *should* show, because you've used `-InformationAction Continue` to turn it on; while your `Write-Verbose` output not showing is expected, because you didn't turn it ... |
56691220 | Set-AzContext works in Azure Cloud Shell but doesn't in Azure PowerShell | 13 | 2019-06-20 17:34:17 | <p>When i execute following command </p>
<pre><code>Clear-AzureProfile
Connect-AzAccount -TenantID xxxxxxxxxxxxxxxxxxx
Set-AzContext -SubscriptionId xxxxxxxxxxxxxxxxxxx
</code></pre>
<p>in <code>Azure PowerShell</code> i get this error. </p>
<pre><code>Set-AzContext : Please provide a valid tenant or a valid subscri... | 21,287 | 3,355,307 | 2023-07-31 14:41:35 | 56,700,929 | 16 | 2019-06-21 09:47:51 | 9,455,659 | 2019-06-21 09:47:51 | https://stackoverflow.com/q/56691220 | https://stackoverflow.com/a/56700929 | <p>Close your powershell and open a new one, or use <code>Clear-AzContext</code>, not <code>Clear-AzureProfile</code>. Then use <code>Connect-AzAccount -Tenant xxxxx -Subscription xxxxx</code>, it should work.</p>
| <p>Close your powershell and open a new one, or use <code>Clear-AzContext</code>, not <code>Clear-AzureProfile</code>. Then use <code>Connect-AzAccount -Tenant xxxxx -Subscription xxxxx</code>, it should work.</p> | 526, 14158, 81879, 126343 | azure, azure-cloud-shell, azure-powershell, powershell | <h1>Set-AzContext works in Azure Cloud Shell but doesn't in Azure PowerShell</h1>
<p>When i execute following command </p>
<pre><code>Clear-AzureProfile
Connect-AzAccount -TenantID xxxxxxxxxxxxxxxxxxx
Set-AzContext -SubscriptionId xxxxxxxxxxxxxxxxxxx
</code></pre>
<p>in <code>Azure PowerShell</code> i get this error.... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,752 | bash | # Set-AzContext works in Azure Cloud Shell but doesn't in Azure PowerShell
When i execute following command
```
Clear-AzureProfile
Connect-AzAccount -TenantID xxxxxxxxxxxxxxxxxxx
Set-AzContext -SubscriptionId xxxxxxxxxxxxxxxxxxx
```
in `Azure PowerShell` i get this error.
```
Set-AzContext : Please provide a valid ... | Close your powershell and open a new one, or use `Clear-AzContext`, not `Clear-AzureProfile`. Then use `Connect-AzAccount -Tenant xxxxx -Subscription xxxxx`, it should work. |
56586562 | How to source an entry point script with Docker? | 13 | 2019-06-13 18:26:18 | <p>I have an Docker image and I can run it:</p>
<pre><code>docker run -it --entrypoint="/bin/bash" gcr.io/docker:tag
</code></pre>
<p>Then I can source a script in the following way:</p>
<pre><code>root@86bfac2f6ccc:/# source entrypoint.sh
</code></pre>
<p>The script looks like that:</p>
<pre><code>more entrypoint... | 54,406 | 6,430,839 | 2020-03-12 14:55:00 | 56,587,335 | 16 | 2019-06-13 19:24:56 | 10,008,173 | 2019-06-13 19:24:56 | https://stackoverflow.com/q/56586562 | https://stackoverflow.com/a/56587335 | <p>When Docker launches a container, there are two parts, the “entrypoint” and the “command”. When both are specified, the “command” part is passed as command-line arguments to the “entrypoint” part.</p>
<p>In particular, the script you show has a very typical pattern for an entrypoint script:</p>
<pre><code>#!/bin/... | <p>When Docker launches a container, there are two parts, the “entrypoint” and the “command”. When both are specified, the “command” part is passed as command-line arguments to the “entrypoint” part.</p> <p>In particular, the script you show has a very typical pattern for an entrypoint script:</p> <pre><code>#!/bin/... | 387, 31391, 90304, 96537 | bash, conda, docker, entry-point | <h1>How to source an entry point script with Docker?</h1>
<p>I have an Docker image and I can run it:</p>
<pre><code>docker run -it --entrypoint="/bin/bash" gcr.io/docker:tag
</code></pre>
<p>Then I can source a script in the following way:</p>
<pre><code>root@86bfac2f6ccc:/# source entrypoint.sh
</code></pre>
<p>T... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,753 | bash | # How to source an entry point script with Docker?
I have an Docker image and I can run it:
```
docker run -it --entrypoint="/bin/bash" gcr.io/docker:tag
```
Then I can source a script in the following way:
```
root@86bfac2f6ccc:/# source entrypoint.sh
```
The script looks like that:
```
more entrypoint.sh
#!/bin... | When Docker launches a container, there are two parts, the “entrypoint” and the “command”. When both are specified, the “command” part is passed as command-line arguments to the “entrypoint” part.
In particular, the script you show has a very typical pattern for an entrypoint script:
```
#!/bin/sh
# ... do some setup... |
44894652 | How do I insert text to the 1st line of a file using sed? | 13 | 2017-07-03 22:40:57 | <p>Hi I'm trying to add text to the 1st line of a file using sed
so far iv'e tried</p>
<pre><code>#!/bin/bash
touch test
sed -i -e '1i/etc/example/live/example.com/fullchain.pem;\' test
</code></pre>
<p>And this dosn't work
also tried </p>
<pre><code>#!/bin/bash
touch test
sed -i "1i ssl_certificate /etc/example/li... | 29,201 | 3,700,919 | 2021-11-11 22:31:36 | 44,894,788 | 16 | 2017-07-03 23:00:10 | 404,556 | 2017-07-03 23:14:18 | https://stackoverflow.com/q/44894652 | https://stackoverflow.com/a/44894788 | <p>Suppose you have a <code>file</code> like this:</p>
<pre><code>one
two
</code></pre>
<p>Then to append to the first line:</p>
<pre><code>$ sed '1 s_$_/etc/example/live/example.com/fullchain.pem;_' file
one/etc/example/live/example.com/fullchain.pem;
two
</code></pre>
<p>To insert before the first line:</p>
<pre... | <p>Suppose you have a <code>file</code> like this:</p> <pre><code>one two </code></pre> <p>Then to append to the first line:</p> <pre><code>$ sed '1 s_$_/etc/example/live/example.com/fullchain.pem;_' file one/etc/example/live/example.com/fullchain.pem; two </code></pre> <p>To insert before the first line:</p> <pre... | 58, 387, 390, 531, 5282 | bash, linux, scripting, sed, shell | <h1>How do I insert text to the 1st line of a file using sed?</h1>
<p>Hi I'm trying to add text to the 1st line of a file using sed
so far iv'e tried</p>
<pre><code>#!/bin/bash
touch test
sed -i -e '1i/etc/example/live/example.com/fullchain.pem;\' test
</code></pre>
<p>And this dosn't work
also tried </p>
<pre><cod... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,754 | bash | # How do I insert text to the 1st line of a file using sed?
Hi I'm trying to add text to the 1st line of a file using sed
so far iv'e tried
```
#!/bin/bash
touch test
sed -i -e '1i/etc/example/live/example.com/fullchain.pem;\' test
```
And this dosn't work
also tried
```
#!/bin/bash
touch test
sed -i "1i ssl_certif... | Suppose you have a `file` like this:
```
one
two
```
Then to append to the first line:
```
$ sed '1 s_$_/etc/example/live/example.com/fullchain.pem;_' file
one/etc/example/live/example.com/fullchain.pem;
two
```
To insert before the first line:
```
$ sed '1 i /etc/example/live/example.com/fullchain.pem;' file
/etc... |
40231125 | Appium Doctor - unable to set $JAVA_HOME/bin into PATH variable on MacOS 10.12 | 13 | 2016-10-25 03:56:08 | <p>Installed appium doctor with npm on MacOS 10.12, and it gives me one error: </p>
<pre><code>WARN AppiumDoctor ✖ Bin directory for $JAVA_HOME is not set.
</code></pre>
<p>I've tried everything I could so far, please help.
Here is my .bash_profile:</p>
<pre><code>export ANDROID_HOME="/Users/sergei/Library/Android/s... | 39,822 | 5,917,497 | 2021-09-22 09:07:24 | 40,276,857 | 16 | 2016-10-27 05:35:02 | 5,917,497 | 2016-10-27 05:35:02 | https://stackoverflow.com/q/40231125 | https://stackoverflow.com/a/40276857 | <p>I removed double quotes from the paths and slashes from the end
This is working fine for me now: </p>
<pre><code>export ANDROID_HOME=/Users/sergei/Library/Android/sdk
export PATH=$ANDROID_HOME/platform-tools:$PATH
export PATH=$ANDROID_HOME/tools:$PATH
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_112.... | <p>I removed double quotes from the paths and slashes from the end This is working fine for me now: </p> <pre><code>export ANDROID_HOME=/Users/sergei/Library/Android/sdk export PATH=$ANDROID_HOME/platform-tools:$PATH export PATH=$ANDROID_HOME/tools:$PATH export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_112.... | 17, 387, 6268, 26220, 90230 | appium, bash, java, java-home, path | <h1>Appium Doctor - unable to set $JAVA_HOME/bin into PATH variable on MacOS 10.12</h1>
<p>Installed appium doctor with npm on MacOS 10.12, and it gives me one error: </p>
<pre><code>WARN AppiumDoctor ✖ Bin directory for $JAVA_HOME is not set.
</code></pre>
<p>I've tried everything I could so far, please help.
Here i... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,755 | bash | # Appium Doctor - unable to set $JAVA_HOME/bin into PATH variable on MacOS 10.12
Installed appium doctor with npm on MacOS 10.12, and it gives me one error:
```
WARN AppiumDoctor ✖ Bin directory for $JAVA_HOME is not set.
```
I've tried everything I could so far, please help.
Here is my .bash_profile:
```
export AN... | I removed double quotes from the paths and slashes from the end
This is working fine for me now:
```
export ANDROID_HOME=/Users/sergei/Library/Android/sdk
export PATH=$ANDROID_HOME/platform-tools:$PATH
export PATH=$ANDROID_HOME/tools:$PATH
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Ho... |
35544015 | How to freeze brew requirements like pip? | 13 | 2016-02-22 00:35:25 | <p>Is there a way or a special command in brew to freeze the installed packages into a requirements.txt file, just like you can with pip in python? And then to quickly reinstall them all from that file?</p>
| 6,853 | 2,039,597 | 2016-02-22 11:14:19 | 35,544,150 | 16 | 2016-02-22 00:52:01 | 162,768 | 2016-02-22 01:33:59 | https://stackoverflow.com/q/35544015 | https://stackoverflow.com/a/35544150 | <p>Edit to answer question w/o version freezing.</p>
<pre><code>brew list >brew.txt
<brew.txt xargs brew install
</code></pre>
<p>--</p>
<p>Homebrew is designed to give you the latest versions of packages. Freezing versions is not its strong point.</p>
<p>There are two features that get you part of the way. <... | <p>Edit to answer question w/o version freezing.</p> <pre><code>brew list >brew.txt <brew.txt xargs brew install </code></pre> <p>--</p> <p>Homebrew is designed to give you the latest versions of packages. Freezing versions is not its strong point.</p> <p>There are two features that get you part of the way. <... | 16, 390, 529, 1067, 1796 | command, homebrew, installation, python, shell | <h1>How to freeze brew requirements like pip?</h1>
<p>Is there a way or a special command in brew to freeze the installed packages into a requirements.txt file, just like you can with pip in python? And then to quickly reinstall them all from that file?</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,756 | bash | # How to freeze brew requirements like pip?
Is there a way or a special command in brew to freeze the installed packages into a requirements.txt file, just like you can with pip in python? And then to quickly reinstall them all from that file? | Edit to answer question w/o version freezing.
```
brew list >brew.txt
<brew.txt xargs brew install
```
--
Homebrew is designed to give you the latest versions of packages. Freezing versions is not its strong point.
There are two features that get you part of the way. `brew list --versions` will print a list of pack... |
26304266 | BASH printf array with field separator and newline on last entry | 13 | 2014-10-10 16:47:43 | <p>How can I print out an array in BASH with a field separator between each value and a newline at the end.</p>
<p>The closest I can get with a single printf is <code>printf '%s|' "${arr1[@]}"</code> where | is the field separator. The problem with this is there is no line break at the end. Any combination of \n I tr... | 27,061 | 2,255,594 | 2024-05-11 19:31:01 | 26,304,373 | 16 | 2014-10-10 16:55:16 | 14,122 | 2014-10-10 16:55:16 | https://stackoverflow.com/q/26304266 | https://stackoverflow.com/a/26304373 | <p>Yes, you need two commands for this. <code>printf '%s|' "${array[@]}"; echo</code> is perfectly conventional.</p>
<p>Alternately, if you don't want the trailing <code>|</code>, you can temporarily modify <code>IFS</code> to use your chosen separator as its first character, and use <code>"${array[*]}"</code>:</p>
<... | <p>Yes, you need two commands for this. <code>printf '%s|' "${array[@]}"; echo</code> is perfectly conventional.</p> <p>Alternately, if you don't want the trailing <code>|</code>, you can temporarily modify <code>IFS</code> to use your chosen separator as its first character, and use <code>"${array[*]}"</code>:</p> <... | 387, 1156 | bash, printf | <h1>BASH printf array with field separator and newline on last entry</h1>
<p>How can I print out an array in BASH with a field separator between each value and a newline at the end.</p>
<p>The closest I can get with a single printf is <code>printf '%s|' "${arr1[@]}"</code> where | is the field separator. The problem ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,757 | bash | # BASH printf array with field separator and newline on last entry
How can I print out an array in BASH with a field separator between each value and a newline at the end.
The closest I can get with a single printf is `printf '%s|' "${arr1[@]}"` where | is the field separator. The problem with this is there is no lin... | Yes, you need two commands for this. `printf '%s|' "${array[@]}"; echo` is perfectly conventional.
Alternately, if you don't want the trailing `|`, you can temporarily modify `IFS` to use your chosen separator as its first character, and use `"${array[*]}"`:
```
IFS="|$IFS"; printf '%s\n' "${array[*]}"; IFS="${IFS:1}... |
22402054 | What is the simplest way to delete the contents of a file in BASH? | 13 | 2014-03-14 10:14:37 | <p>I need to delete all lines in a file, but leave essentially an empty file with no content and no lines. As best I know, one can do this:</p>
<pre><code>rm file.txt 2> /dev/null
touch file.txt
</code></pre>
<p>However, is there a simpler, more canonical solution in BASH?</p>
| 18,645 | 834,616 | 2014-03-14 12:29:31 | 22,402,310 | 16 | 2014-03-14 10:24:31 | 480,641 | 2014-03-14 10:24:31 | https://stackoverflow.com/q/22402054 | https://stackoverflow.com/a/22402310 | <p>You can use truncate.</p>
<pre><code>truncate -s 0 filename
</code></pre>
| <p>You can use truncate.</p> <pre><code>truncate -s 0 filename </code></pre> | 387 | bash | <h1>What is the simplest way to delete the contents of a file in BASH?</h1>
<p>I need to delete all lines in a file, but leave essentially an empty file with no content and no lines. As best I know, one can do this:</p>
<pre><code>rm file.txt 2> /dev/null
touch file.txt
</code></pre>
<p>However, is there a simpler... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,758 | bash | # What is the simplest way to delete the contents of a file in BASH?
I need to delete all lines in a file, but leave essentially an empty file with no content and no lines. As best I know, one can do this:
```
rm file.txt 2> /dev/null
touch file.txt
```
However, is there a simpler, more canonical solution in BASH? | You can use truncate.
```
truncate -s 0 filename
``` |
22187834 | gnu parallel: output each job to a different file | 13 | 2014-03-05 03:20:29 | <p>I am trying to process so text files with <code>awk</code> using the <code>parallel</code> command as a shell script, but haven't been able to get it to output each job to a different file</p>
<p>If i try:</p>
<pre><code>seq 10 | parallel awk \''{ if ( $5 > 0.4 ) print $2}'\' file{}.txt > file{}.out
</code><... | 9,665 | 2,341,679 | 2022-11-30 16:47:23 | 22,188,070 | 16 | 2014-03-05 03:43:40 | 2,341,679 | 2014-03-05 03:43:40 | https://stackoverflow.com/q/22187834 | https://stackoverflow.com/a/22188070 | <p>It turns out I needed to quote out the redirect, because it was being processed outside of <code>parallel</code>:</p>
<pre><code>seq 10 | parallel awk \''{...}'\' file{}.txt ">" file{}.out
</code></pre>
| <p>It turns out I needed to quote out the redirect, because it was being processed outside of <code>parallel</code>:</p> <pre><code>seq 10 | parallel awk \''{...}'\' file{}.txt ">" file{}.out </code></pre> | 387, 82247 | bash, gnu-parallel | <h1>gnu parallel: output each job to a different file</h1>
<p>I am trying to process so text files with <code>awk</code> using the <code>parallel</code> command as a shell script, but haven't been able to get it to output each job to a different file</p>
<p>If i try:</p>
<pre><code>seq 10 | parallel awk \''{ if ( $5 ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,759 | bash | # gnu parallel: output each job to a different file
I am trying to process so text files with `awk` using the `parallel` command as a shell script, but haven't been able to get it to output each job to a different file
If i try:
```
seq 10 | parallel awk \''{ if ( $5 > 0.4 ) print $2}'\' file{}.txt > file{}.out
```
... | It turns out I needed to quote out the redirect, because it was being processed outside of `parallel`:
```
seq 10 | parallel awk \''{...}'\' file{}.txt ">" file{}.out
``` |
17743430 | Error: Could not find or load main class xxx Linux | 13 | 2013-07-19 10:05:30 | <p>I am very new to linux environment.</p>
<p>I am trying to run an simple hello world java class in linux environment.</p>
<h1>Hello .java</h1>
<pre><code> package com.util;
public class Hello {
/**
* @param args
*/
public static void main(String[] args) {
System.... | 65,907 | 1,660,325 | 2022-10-16 00:31:07 | 17,743,942 | 16 | 2013-07-19 10:30:47 | 112,500 | 2013-07-19 10:35:54 | https://stackoverflow.com/q/17743430 | https://stackoverflow.com/a/17743942 | <p>navigate to /home/scripts using terminal</p>
<pre><code>javac com/util/Hello.java
</code></pre>
<p>then</p>
<pre><code>cd /home/scripts
java -cp . com.util.Hello
</code></pre>
<p>Or,</p>
<pre><code>java -cp "/home/scripts" com.util.Hello
</code></pre>
| <p>navigate to /home/scripts using terminal</p> <pre><code>javac com/util/Hello.java </code></pre> <p>then</p> <pre><code>cd /home/scripts java -cp . com.util.Hello </code></pre> <p>Or,</p> <pre><code>java -cp "/home/scripts" com.util.Hello </code></pre> | 17, 58, 390 | java, linux, shell | <h1>Error: Could not find or load main class xxx Linux</h1>
<p>I am very new to linux environment.</p>
<p>I am trying to run an simple hello world java class in linux environment.</p>
<h1>Hello .java</h1>
<pre><code> package com.util;
public class Hello {
/**
* @param args
*/
... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,760 | bash | # Error: Could not find or load main class xxx Linux
I am very new to linux environment.
I am trying to run an simple hello world java class in linux environment.
# Hello .java
```
package com.util;
public class Hello {
/**
* @param args
*/
public static void main(String[] a... | navigate to /home/scripts using terminal
```
javac com/util/Hello.java
```
then
```
cd /home/scripts
java -cp . com.util.Hello
```
Or,
```
java -cp "/home/scripts" com.util.Hello
``` |
12945987 | recursively rename directories in bash | 13 | 2012-10-18 01:54:09 | <p>I'd like to recursively rename all directories containing the string <em>foo</em> by replacing that part of the string with <em>Bar</em>. I've got something like this so far, but it doesn't quite work. I'd also like <em>foo</em> to be searched <strong>case-insensitive</strong>.</p>
<p><code>find . -type d -exec b... | 10,321 | 332,913 | 2023-10-13 18:24:07 | 12,946,034 | 16 | 2012-10-18 02:03:11 | 465,183 | 2023-10-13 18:24:07 | https://stackoverflow.com/q/12945987 | https://stackoverflow.com/a/12946034 | <p>Try the following code using <em>parameter expansion</em></p>
<pre><code>find . -type d -iname '*foo*' -depth -exec bash -c '
echo mv "$1" "${1//[Ff][Oo][Oo]/BAr}"
' -- {} \;
</code></pre>
<p>But your best bet will be using <a href="https://unix.stackexchange.com/questions/730894/what-about-r... | <p>Try the following code using <em>parameter expansion</em></p> <pre><code>find . -type d -iname '*foo*' -depth -exec bash -c ' echo mv "$1" "${1//[Ff][Oo][Oo]/BAr}" ' -- {} \; </code></pre> <p>But your best bet will be using <a href="https://unix.stackexchange.com/questions/730894/what-about-r... | 387 | bash | <h1>recursively rename directories in bash</h1>
<p>I'd like to recursively rename all directories containing the string <em>foo</em> by replacing that part of the string with <em>Bar</em>. I've got something like this so far, but it doesn't quite work. I'd also like <em>foo</em> to be searched <strong>case-insensitiv... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 8,761 | bash | # recursively rename directories in bash
I'd like to recursively rename all directories containing the string *foo* by replacing that part of the string with *Bar*. I've got something like this so far, but it doesn't quite work. I'd also like *foo* to be searched **case-insensitive**.
`find . -type d -exec bash -c 'm... | Try the following code using *parameter expansion*
```
find . -type d -iname '*foo*' -depth -exec bash -c '
echo mv "$1" "${1//[Ff][Oo][Oo]/BAr}"
' -- {} \;
```
But your best bet will be using [Perl's `rename`](https://unix.stackexchange.com/questions/730894/what-about-rename-different-versions-and-usage-what-is-... |
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