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16676750 | Windows, Emacs, Git Bash, and shell-command | 6 | 2013-05-21 18:14:12 | <p>Windows 7. Emacs 24.3.1. Git 1.8.1.msysgit.1. I have the following in my equivalent .emacs file:</p>
<pre><code>(if (equal system-type 'windows-nt)
(progn (setq explicit-shell-file-name
"C:/Program Files (x86)/Git/bin/sh.exe")
(setq shell-file-name "bash")
(setq explicit-s... | 10,746 | 500,207 | 2018-04-19 09:28:41 | 16,677,257 | 13 | 2013-05-21 18:43:15 | 973,603 | 2013-05-21 18:43:15 | https://stackoverflow.com/q/16676750 | https://stackoverflow.com/a/16677257 | <p>Try setting both variables to point to the same executable and make sure the path is in <code>exec-path</code>:</p>
<pre><code>(setq explicit-shell-file-name
"C:/Program Files (x86)/Git/bin/bash.exe")
(setq shell-file-name explicit-shell-file-name)
(add-to-list 'exec-path "C:/Program Files (x86)/Git/bin")
</c... | <p>Try setting both variables to point to the same executable and make sure the path is in <code>exec-path</code>:</p> <pre><code>(setq explicit-shell-file-name "C:/Program Files (x86)/Git/bin/bash.exe") (setq shell-file-name explicit-shell-file-name) (add-to-list 'exec-path "C:/Program Files (x86)/Git/bin") </c... | 64, 371, 390 | emacs, shell, windows | <h1>Windows, Emacs, Git Bash, and shell-command</h1>
<p>Windows 7. Emacs 24.3.1. Git 1.8.1.msysgit.1. I have the following in my equivalent .emacs file:</p>
<pre><code>(if (equal system-type 'windows-nt)
(progn (setq explicit-shell-file-name
"C:/Program Files (x86)/Git/bin/sh.exe")
(set... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,571 | bash | # Windows, Emacs, Git Bash, and shell-command
Windows 7. Emacs 24.3.1. Git 1.8.1.msysgit.1. I have the following in my equivalent .emacs file:
```
(if (equal system-type 'windows-nt)
(progn (setq explicit-shell-file-name
"C:/Program Files (x86)/Git/bin/sh.exe")
(setq shell-file-name "b... | Try setting both variables to point to the same executable and make sure the path is in `exec-path`:
```
(setq explicit-shell-file-name
"C:/Program Files (x86)/Git/bin/bash.exe")
(setq shell-file-name explicit-shell-file-name)
(add-to-list 'exec-path "C:/Program Files (x86)/Git/bin")
``` |
16626218 | Composer.phar don't want to run by shell_exec from PHP script. Why? | 6 | 2013-05-18 15:58:44 | <p>Trying to execute it with all possible params, such as -d and full path etc.. No errors. When running another commands, all is ok, when running composer from CMD, all is ok too. Have tried exec, system, shell_exec etc.. What it could be?</p>
<blockquote>
<p>echo system('php composer.phar install');</p>
</blockquo... | 5,227 | 217,128 | 2020-08-06 07:09:03 | 16,626,248 | 13 | 2013-05-18 16:01:52 | 2,396,993 | 2013-10-27 08:09:43 | https://stackoverflow.com/q/16626218 | https://stackoverflow.com/a/16626248 | <p>Try outputting the error stream as well:</p>
<pre><code>system('php composer.phar install 2>&1');
</code></pre>
<p>It might give you more of a hint as to what is going wrong.</p>
| <p>Try outputting the error stream as well:</p> <pre><code>system('php composer.phar install 2>&1'); </code></pre> <p>It might give you more of a hint as to what is going wrong.</p> | 5, 5163, 7932, 8646, 78546 | composer-php, exec, php, shell-exec, system | <h1>Composer.phar don't want to run by shell_exec from PHP script. Why?</h1>
<p>Trying to execute it with all possible params, such as -d and full path etc.. No errors. When running another commands, all is ok, when running composer from CMD, all is ok too. Have tried exec, system, shell_exec etc.. What it could be?</p... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,572 | bash | # Composer.phar don't want to run by shell_exec from PHP script. Why?
Trying to execute it with all possible params, such as -d and full path etc.. No errors. When running another commands, all is ok, when running composer from CMD, all is ok too. Have tried exec, system, shell_exec etc.. What it could be?
> echo sys... | Try outputting the error stream as well:
```
system('php composer.phar install 2>&1');
```
It might give you more of a hint as to what is going wrong. |
16325452 | IF Statement not working in Powershell | 6 | 2013-05-01 19:56:37 | <p>I've been trying to get an IF-ELSE clause to work within my little powershell v2 script, and I think I'm having some problems with my parsing. Here's the code I have currently:</p>
<pre><code>$dir = test-path C:\Perflogs\TestFolder
IF($dir -eq "False")
{
New-Item C:\Perflogs\TestFolder -type directory
get-counte... | 12,622 | 2,133,338 | 2021-05-21 07:17:53 | 16,325,604 | 13 | 2013-05-01 20:05:56 | 6,920 | 2013-05-01 20:05:56 | https://stackoverflow.com/q/16325452 | https://stackoverflow.com/a/16325604 | <p>You should have:</p>
<pre><code>if ($dir -eq $false)
</code></pre>
<p>because the string <code>"False"</code> is not equal to the boolean value <code>$false</code>.</p>
| <p>You should have:</p> <pre><code>if ($dir -eq $false) </code></pre> <p>because the string <code>"False"</code> is not equal to the boolean value <code>$false</code>.</p> | 526, 2773, 24067 | if-statement, powershell, powershell-2.0 | <h1>IF Statement not working in Powershell</h1>
<p>I've been trying to get an IF-ELSE clause to work within my little powershell v2 script, and I think I'm having some problems with my parsing. Here's the code I have currently:</p>
<pre><code>$dir = test-path C:\Perflogs\TestFolder
IF($dir -eq "False")
{
New-Item C... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,573 | bash | # IF Statement not working in Powershell
I've been trying to get an IF-ELSE clause to work within my little powershell v2 script, and I think I'm having some problems with my parsing. Here's the code I have currently:
```
$dir = test-path C:\Perflogs\TestFolder
IF($dir -eq "False")
{
New-Item C:\Perflogs\TestFolde... | You should have:
```
if ($dir -eq $false)
```
because the string `"False"` is not equal to the boolean value `$false`. |
15707219 | Can I use the environment variable %PROGRAMDATA%? | 6 | 2013-03-29 16:25:02 | <p>I type:</p>
<p><code>echo $USERPROFILE</code> and get <code>C:\Users\rob</code></p>
<p><code>echo $PROGRAMFILES</code> and get <code>C:\Program Files (x86)</code></p>
<p><code>echo $PROGRAMDATA</code> and get nothing.</p>
<p>Under windows <code>%PROGRAMDATA%</code> evaluates to <code>C:\ProgramData</code></p>
<... | 12,955 | 221,801 | 2013-04-18 06:22:23 | 16,075,834 | 13 | 2013-04-18 06:20:03 | 1,002,260 | 2013-04-18 06:20:03 | https://stackoverflow.com/q/15707219 | https://stackoverflow.com/a/16075834 | <p>It is mixed case</p>
<pre class="lang-sh prettyprint-override"><code>$ set | grep -i programdata
ALLUSERSPROFILE='C:\ProgramData'
ProgramData='C:\ProgramData'
$ echo $ProgramData
C:\ProgramData
</code></pre>
| <p>It is mixed case</p> <pre class="lang-sh prettyprint-override"><code>$ set | grep -i programdata ALLUSERSPROFILE='C:\ProgramData' ProgramData='C:\ProgramData' $ echo $ProgramData C:\ProgramData </code></pre> | 387, 390, 1731, 69665 | bash, cygwin, shell, windows-8 | <h1>Can I use the environment variable %PROGRAMDATA%?</h1>
<p>I type:</p>
<p><code>echo $USERPROFILE</code> and get <code>C:\Users\rob</code></p>
<p><code>echo $PROGRAMFILES</code> and get <code>C:\Program Files (x86)</code></p>
<p><code>echo $PROGRAMDATA</code> and get nothing.</p>
<p>Under windows <code>%PROGRAMD... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,574 | bash | # Can I use the environment variable %PROGRAMDATA%?
I type:
`echo $USERPROFILE` and get `C:\Users\rob`
`echo $PROGRAMFILES` and get `C:\Program Files (x86)`
`echo $PROGRAMDATA` and get nothing.
Under windows `%PROGRAMDATA%` evaluates to `C:\ProgramData`
Why are some windows environment variables supported and not... | It is mixed case
```
$ set | grep -i programdata
ALLUSERSPROFILE='C:\ProgramData'
ProgramData='C:\ProgramData'
$ echo $ProgramData
C:\ProgramData
``` |
15914109 | using powershell to change registry binary data | 6 | 2013-04-09 23:05:04 | <p>I understand that with powershell it's possible to change registry values.</p>
<p>for example, here: <a href="http://poshcode.org/3504" rel="noreferrer">http://poshcode.org/3504</a></p>
<p>we can set the properties like this:</p>
<pre><code>Set-ItemProperty 'HKCU:\Software\Microsoft\Windows\Shell\Associations\Url... | 12,136 | 117,700 | 2015-06-09 01:02:13 | 15,914,470 | 13 | 2013-04-09 23:41:15 | 251,123 | 2013-04-09 23:41:15 | https://stackoverflow.com/q/15914109 | https://stackoverflow.com/a/15914470 | <ol>
<li>Read the value (a byte array)</li>
<li>Modify the array element</li>
<li>Write the byte array back to the registry key.</li>
</ol>
<p>Here's an example:</p>
<pre><code>$key = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections'
$data = (Get-ItemProperty -Path $key -Name DefaultCon... | <ol> <li>Read the value (a byte array)</li> <li>Modify the array element</li> <li>Write the byte array back to the registry key.</li> </ol> <p>Here's an example:</p> <pre><code>$key = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections' $data = (Get-ItemProperty -Path $key -Name DefaultCon... | 64, 368, 526, 1189 | binary, internet-explorer, powershell, windows | <h1>using powershell to change registry binary data</h1>
<p>I understand that with powershell it's possible to change registry values.</p>
<p>for example, here: <a href="http://poshcode.org/3504" rel="noreferrer">http://poshcode.org/3504</a></p>
<p>we can set the properties like this:</p>
<pre><code>Set-ItemProperty... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,575 | bash | # using powershell to change registry binary data
I understand that with powershell it's possible to change registry values.
for example, here: <http://poshcode.org/3504>
we can set the properties like this:
```
Set-ItemProperty 'HKCU:\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\ftp\UserChoice' -n... | 1. Read the value (a byte array)
2. Modify the array element
3. Write the byte array back to the registry key.
Here's an example:
```
$key = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections'
$data = (Get-ItemProperty -Path $key -Name DefaultConnectionSettings).DefaultConnectionSettings
... |
15596826 | What is the difference between $@ and $* in shell script? | 6 | 2013-03-24 09:19:44 | <p>in my <code>script.sh</code>:</p>
<pre><code>aa=$@
bb=$*
echo $aa
echo $bb
</code></pre>
<p>when running it:</p>
<pre><code> source script.sh a b c d e f g
</code></pre>
<p>I get:</p>
<pre><code>a b c d e f g
a b c d e f g
</code></pre>
<p>What is the difference between <code>$@</code> and <code>$*</code> ?</p... | 19,356 | 1,031,417 | 2013-03-24 09:31:07 | 15,596,832 | 13 | 2013-03-24 09:20:29 | 1,458,569 | 2013-03-24 09:31:07 | https://stackoverflow.com/q/15596826 | https://stackoverflow.com/a/15596832 | <p>There are no difference between <code>$*</code> and <code>$@</code>, but there is a difference between <code>"$@"</code> and <code>"$*"</code>. </p>
<pre><code>$ cat 1.sh
mkdir "$*"
$ cat 2.sh
mkdir "$@"
$ sh 1.sh a "b c" d
$ ls -l
total 12
-rw-r--r-- 1 igor igor 11 mar 24 10:20 1.sh
-rw-r--r-- 1 igor igor 1... | <p>There are no difference between <code>$*</code> and <code>$@</code>, but there is a difference between <code>"$@"</code> and <code>"$*"</code>. </p> <pre><code>$ cat 1.sh mkdir "$*" $ cat 2.sh mkdir "$@" $ sh 1.sh a "b c" d $ ls -l total 12 -rw-r--r-- 1 igor igor 11 mar 24 10:20 1.sh -rw-r--r-- 1 igor igor 1... | 58, 387, 390 | bash, linux, shell | <h1>What is the difference between $@ and $* in shell script?</h1>
<p>in my <code>script.sh</code>:</p>
<pre><code>aa=$@
bb=$*
echo $aa
echo $bb
</code></pre>
<p>when running it:</p>
<pre><code> source script.sh a b c d e f g
</code></pre>
<p>I get:</p>
<pre><code>a b c d e f g
a b c d e f g
</code></pre>
<p>What... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,576 | bash | # What is the difference between $@ and $* in shell script?
in my `script.sh`:
```
aa=$@
bb=$*
echo $aa
echo $bb
```
when running it:
```
source script.sh a b c d e f g
```
I get:
```
a b c d e f g
a b c d e f g
```
What is the difference between `$@` and `$*` ? | There are no difference between `$*` and `$@`, but there is a difference between `"$@"` and `"$*"`.
```
$ cat 1.sh
mkdir "$*"
$ cat 2.sh
mkdir "$@"
$ sh 1.sh a "b c" d
$ ls -l
total 12
-rw-r--r-- 1 igor igor 11 mar 24 10:20 1.sh
-rw-r--r-- 1 igor igor 11 mar 24 10:20 2.sh
drwxr-xr-x 2 igor igor 4096 mar 24 10:2... |
13502776 | Import-Pssession is not importing cmdlets when used in a custom module | 6 | 2012-11-21 22:03:31 | <p>I have a PowerShell script/function that works great when I use it in my PowerShell profile or manually copy/paste the function in the PowerShell window.</p>
<p>I'm trying to make the function accessible to other members of my team as a module. I want to have the module stored in a central place so we can all add ... | 6,401 | 1,768,335 | 2018-10-25 17:32:53 | 13,972,622 | 13 | 2012-12-20 12:50:47 | 1,768,335 | 2015-03-31 07:44:06 | https://stackoverflow.com/q/13502776 | https://stackoverflow.com/a/13972622 | <p>With some assistance from TechNet I was able to modify the script module so it worked the way I expected.</p>
<pre><code>function Connect-O365 {
$o365cred = Get-Credential username@domain.onmicrosoft.com
$session365 = New-PSSession `
-ConfigurationName Microsoft.Exchange `
... | <p>With some assistance from TechNet I was able to modify the script module so it worked the way I expected.</p> <pre><code>function Connect-O365 { $o365cred = Get-Credential username@domain.onmicrosoft.com $session365 = New-PSSession ` -ConfigurationName Microsoft.Exchange ` ... | 526, 73157 | powershell, powershell-3.0 | <h1>Import-Pssession is not importing cmdlets when used in a custom module</h1>
<p>I have a PowerShell script/function that works great when I use it in my PowerShell profile or manually copy/paste the function in the PowerShell window.</p>
<p>I'm trying to make the function accessible to other members of my team as a... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,577 | bash | # Import-Pssession is not importing cmdlets when used in a custom module
I have a PowerShell script/function that works great when I use it in my PowerShell profile or manually copy/paste the function in the PowerShell window.
I'm trying to make the function accessible to other members of my team as a module. I want ... | With some assistance from TechNet I was able to modify the script module so it worked the way I expected.
```
function Connect-O365 {
$o365cred = Get-Credential username@domain.onmicrosoft.com
$session365 = New-PSSession `
-ConfigurationName Microsoft.Exchange `
-Connect... |
13790956 | MYSQL differs in Output from script | 6 | 2012-12-09 19:33:08 | <p>I have a problem with the MySQL output formatting while executing the commands from a bash script.</p>
<p>If I execute a command on the command line then, I am able to get the output in formatted as expected.</p>
<pre><code>$ mysql -u dbclient -pxxxx GEKONYLOGDB -e "select now(),max(time_stamp) from metrics"
+---... | 2,256 | 1,005,707 | 2019-10-15 13:04:20 | 13,790,972 | 13 | 2012-12-09 19:34:50 | 541,091 | 2017-04-25 13:24:04 | https://stackoverflow.com/q/13790956 | https://stackoverflow.com/a/13790972 | <p>Pass the <code>-t</code> or <code>--table</code> option to force table output.</p>
<pre><code>mysql --table -u dbclient -pxxxx GEKONYLOGDB -e "select now(),max(time_stamp) from metrics"
</code></pre>
<p>From <code>mysql --help</code>:</p>
<pre><code> -t, --table Output in table format.
</code></pre>
| <p>Pass the <code>-t</code> or <code>--table</code> option to force table output.</p> <pre><code>mysql --table -u dbclient -pxxxx GEKONYLOGDB -e "select now(),max(time_stamp) from metrics" </code></pre> <p>From <code>mysql --help</code>:</p> <pre><code> -t, --table Output in table format. </code></pre> | 21, 58, 387 | bash, linux, mysql | <h1>MYSQL differs in Output from script</h1>
<p>I have a problem with the MySQL output formatting while executing the commands from a bash script.</p>
<p>If I execute a command on the command line then, I am able to get the output in formatted as expected.</p>
<pre><code>$ mysql -u dbclient -pxxxx GEKONYLOGDB -e "se... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,578 | bash | # MYSQL differs in Output from script
I have a problem with the MySQL output formatting while executing the commands from a bash script.
If I execute a command on the command line then, I am able to get the output in formatted as expected.
```
$ mysql -u dbclient -pxxxx GEKONYLOGDB -e "select now(),max(time_stamp) f... | Pass the `-t` or `--table` option to force table output.
```
mysql --table -u dbclient -pxxxx GEKONYLOGDB -e "select now(),max(time_stamp) from metrics"
```
From `mysql --help`:
```
-t, --table Output in table format.
``` |
13709315 | sh script not finding variables | 6 | 2012-12-04 18:16:47 | <p>I am following a tutorial on how to run a reverse ssh tunnel which is found at <a href="http://wiki.fabelier.org/index.php?title=Permanent_Reverse_SSH_Tunneling" rel="noreferrer">http://wiki.fabelier.org/index.php?title=Permanent_Reverse_SSH_Tunneling</a> Issue I am having is when I run the tunneling.sh script:</p>
... | 27,860 | 323,332 | 2012-12-06 04:01:29 | 13,709,746 | 13 | 2012-12-04 18:43:40 | 3,333 | 2012-12-04 18:43:40 | https://stackoverflow.com/q/13709315 | https://stackoverflow.com/a/13709746 | <p>Don't specify <code>#!/bin/sh</code> in your "shebang" line if you're going to use bash features. If you want bash, ask for bash.</p>
| <p>Don't specify <code>#!/bin/sh</code> in your "shebang" line if you're going to use bash features. If you want bash, ask for bash.</p> | 58, 10327 | linux, sh | <h1>sh script not finding variables</h1>
<p>I am following a tutorial on how to run a reverse ssh tunnel which is found at <a href="http://wiki.fabelier.org/index.php?title=Permanent_Reverse_SSH_Tunneling" rel="noreferrer">http://wiki.fabelier.org/index.php?title=Permanent_Reverse_SSH_Tunneling</a> Issue I am having is... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,579 | bash | # sh script not finding variables
I am following a tutorial on how to run a reverse ssh tunnel which is found at <http://wiki.fabelier.org/index.php?title=Permanent_Reverse_SSH_Tunneling> Issue I am having is when I run the tunneling.sh script:
```
#!/bin/sh
a=`ps -ef | grep 19999 | grep -v grep`
if [ ! "$a" ]; then
... | Don't specify `#!/bin/sh` in your "shebang" line if you're going to use bash features. If you want bash, ask for bash. |
13571566 | Bash alphanumeric list generating | 6 | 2012-11-26 19:18:07 | <p>I need print something like this:</p>
<pre><code>a
b
c
.
.
.
z
A
B
C
.
.
.
Z
0
1
2
.
.
.
9
</code></pre>
<p>with this is can be done for separately but.</p>
<pre><code> for f in {a..z};
do
echo $f;
done
for f in {A..Z};
do
echo $f;
done
for f in {0..9};
do
ech... | 5,193 | 1,765,681 | 2021-01-13 07:21:38 | 13,571,603 | 13 | 2012-11-26 19:20:48 | 1,848,654 | 2012-11-26 19:20:48 | https://stackoverflow.com/q/13571566 | https://stackoverflow.com/a/13571603 | <pre><code>for f in {a..z} {A..Z} {0..9}; do
echo "$f"
done
</code></pre>
| <pre><code>for f in {a..z} {A..Z} {0..9}; do echo "$f" done </code></pre> | 58, 387, 2531, 10327 | bash, for-loop, linux, sh | <h1>Bash alphanumeric list generating</h1>
<p>I need print something like this:</p>
<pre><code>a
b
c
.
.
.
z
A
B
C
.
.
.
Z
0
1
2
.
.
.
9
</code></pre>
<p>with this is can be done for separately but.</p>
<pre><code> for f in {a..z};
do
echo $f;
done
for f in {A..Z};
do
echo $f;
do... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,580 | bash | # Bash alphanumeric list generating
I need print something like this:
```
a
b
c
.
.
.
z
A
B
C
.
.
.
Z
0
1
2
.
.
.
9
```
with this is can be done for separately but.
```
for f in {a..z};
do
echo $f;
done
for f in {A..Z};
do
echo $f;
done
for f in {0..9};
do
echo... | ```
for f in {a..z} {A..Z} {0..9}; do
echo "$f"
done
``` |
12343227 | Escaping bash function arguments for use by su -c | 6 | 2012-09-09 21:40:11 | <p>I'd like to be able to write a function <code>su_mt_user</code> that (currently) looks like this:</p>
<pre><code>su_mt_user() {
su someuser -c "$*"
}
</code></pre>
<p>The objective is to be able to use it like this:</p>
<pre><code>su_mt_user mt-auth --stuff etc
</code></pre>
<p>Which would run the command <c... | 4,247 | 109,696 | 2012-09-09 23:03:28 | 12,343,661 | 13 | 2012-09-09 22:56:17 | 387,076 | 2012-09-09 23:03:28 | https://stackoverflow.com/q/12343227 | https://stackoverflow.com/a/12343661 | <p>To pass multiple arguments through a function to a command, you need <code>"$@"</code>. <code>"$@"</code> is special in that even though it's between double quotes, the separate arguments end up in different words, so they're passed down exactly as is. This is different from <code>$@</code> or <code>$*</code> withou... | <p>To pass multiple arguments through a function to a command, you need <code>"$@"</code>. <code>"$@"</code> is special in that even though it's between double quotes, the separate arguments end up in different words, so they're passed down exactly as is. This is different from <code>$@</code> or <code>$*</code> withou... | 387, 2313, 4804, 5569, 13784 | arguments, bash, escaping, function, su | <h1>Escaping bash function arguments for use by su -c</h1>
<p>I'd like to be able to write a function <code>su_mt_user</code> that (currently) looks like this:</p>
<pre><code>su_mt_user() {
su someuser -c "$*"
}
</code></pre>
<p>The objective is to be able to use it like this:</p>
<pre><code>su_mt_user mt-auth -... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,581 | bash | # Escaping bash function arguments for use by su -c
I'd like to be able to write a function `su_mt_user` that (currently) looks like this:
```
su_mt_user() {
su someuser -c "$*"
}
```
The objective is to be able to use it like this:
```
su_mt_user mt-auth --stuff etc
```
Which would run the command `mt-auth --... | To pass multiple arguments through a function to a command, you need `"$@"`. `"$@"` is special in that even though it's between double quotes, the separate arguments end up in different words, so they're passed down exactly as is. This is different from `$@` or `$*` without quotes, which would additionally split each a... |
11267015 | how to ignore blank lines and comment lines using awk | 6 | 2012-06-29 18:23:17 | <p>i am writing this code:</p>
<pre><code>awk -F'=' '!/^$/{arr[$1]=$2}END{for (x in arr) {print x"="arr[x]}}' 1.txt 2.txt
</code></pre>
<p>this code ignore blank lines, but i also want to ignore line starting with # (comments).</p>
<p>Any idea how to add multiple patterns?</p>
| 21,520 | 1,486,386 | 2014-03-16 21:36:33 | 11,267,059 | 13 | 2012-06-29 18:26:22 | 47,529 | 2012-06-29 20:55:57 | https://stackoverflow.com/q/11267015 | https://stackoverflow.com/a/11267059 | <p>Change <code>!/^$/</code> to</p>
<pre><code>!/^($|#)/
</code></pre>
<p>or</p>
<pre><code>!/^($|[:space:]*#)/
</code></pre>
<p>if you want to disregard whitespace before the <code>#</code>.</p>
| <p>Change <code>!/^$/</code> to</p> <pre><code>!/^($|#)/ </code></pre> <p>or</p> <pre><code>!/^($|[:space:]*#)/ </code></pre> <p>if you want to disregard whitespace before the <code>#</code>.</p> | 18, 58, 387, 990 | awk, bash, linux, regex | <h1>how to ignore blank lines and comment lines using awk</h1>
<p>i am writing this code:</p>
<pre><code>awk -F'=' '!/^$/{arr[$1]=$2}END{for (x in arr) {print x"="arr[x]}}' 1.txt 2.txt
</code></pre>
<p>this code ignore blank lines, but i also want to ignore line starting with # (comments).</p>
<p>Any idea how to add... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,582 | bash | # how to ignore blank lines and comment lines using awk
i am writing this code:
```
awk -F'=' '!/^$/{arr[$1]=$2}END{for (x in arr) {print x"="arr[x]}}' 1.txt 2.txt
```
this code ignore blank lines, but i also want to ignore line starting with # (comments).
Any idea how to add multiple patterns? | Change `!/^$/` to
```
!/^($|#)/
```
or
```
!/^($|[:space:]*#)/
```
if you want to disregard whitespace before the `#`. |
10658924 | How to find the Set - Subset of two files from the command line? | 6 | 2012-05-18 19:56:08 | <p>I have two files with sorted lines. One file (B) is a subset of the other file (A). I would like to find all lines in A that ARE NOT in B. Ideally, I would like to create a file (C) that contains these lines. Is this possible in Unix? I'm looking for a one line command to do this instead of writing a script. I looke... | 2,888 | 636,493 | 2012-06-13 12:56:38 | 10,659,032 | 13 | 2012-05-18 20:05:16 | 1,231,364 | 2012-06-13 12:56:38 | https://stackoverflow.com/q/10658924 | https://stackoverflow.com/a/10659032 | <p>This will suppress common lines:</p>
<pre><code>comm -3 a b
</code></pre>
| <p>This will suppress common lines:</p> <pre><code>comm -3 a b </code></pre> | 34, 58, 387, 3791, 8470 | bash, linux, set, unix, zsh | <h1>How to find the Set - Subset of two files from the command line?</h1>
<p>I have two files with sorted lines. One file (B) is a subset of the other file (A). I would like to find all lines in A that ARE NOT in B. Ideally, I would like to create a file (C) that contains these lines. Is this possible in Unix? I'm look... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,583 | bash | # How to find the Set - Subset of two files from the command line?
I have two files with sorted lines. One file (B) is a subset of the other file (A). I would like to find all lines in A that ARE NOT in B. Ideally, I would like to create a file (C) that contains these lines. Is this possible in Unix? I'm looking for a... | This will suppress common lines:
```
comm -3 a b
``` |
10558439 | Ruby cannot see NLS_LANG environmental variable | 6 | 2012-05-11 20:50:32 | <p>I'm running a ruby script on CentOS, and installed ruby via rvm (1.9.3).</p>
<p>I've set the NLS_LANG variable in .bash_profile.</p>
<pre><code>[app@box stasis]$ echo $NLS_LANG
en_US.UTF-8
[app@box stasis]$ which ruby
~/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
</code></pre>
<p>However when trying to access it via rub... | 11,483 | 104,588 | 2012-05-13 22:57:40 | 10,559,031 | 13 | 2012-05-11 21:43:30 | 497,756 | 2012-05-11 21:43:30 | https://stackoverflow.com/q/10558439 | https://stackoverflow.com/a/10559031 | <p>You need to export your variables to be available in any applications run (unless they are functions):</p>
<pre><code>export NLS_LANG
</code></pre>
<p>or together with setting:</p>
<pre><code>export NLS_LANG=en_US.UTF-8
</code></pre>
<p>or as on most systems <code>LANG</code> should be available:</p>
<pre><code... | <p>You need to export your variables to be available in any applications run (unless they are functions):</p> <pre><code>export NLS_LANG </code></pre> <p>or together with setting:</p> <pre><code>export NLS_LANG=en_US.UTF-8 </code></pre> <p>or as on most systems <code>LANG</code> should be available:</p> <pre><code... | 12, 387, 8409 | bash, oci8, ruby | <h1>Ruby cannot see NLS_LANG environmental variable</h1>
<p>I'm running a ruby script on CentOS, and installed ruby via rvm (1.9.3).</p>
<p>I've set the NLS_LANG variable in .bash_profile.</p>
<pre><code>[app@box stasis]$ echo $NLS_LANG
en_US.UTF-8
[app@box stasis]$ which ruby
~/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
<... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,584 | bash | # Ruby cannot see NLS_LANG environmental variable
I'm running a ruby script on CentOS, and installed ruby via rvm (1.9.3).
I've set the NLS_LANG variable in .bash_profile.
```
[app@box stasis]$ echo $NLS_LANG
en_US.UTF-8
[app@box stasis]$ which ruby
~/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
```
However when trying to ... | You need to export your variables to be available in any applications run (unless they are functions):
```
export NLS_LANG
```
or together with setting:
```
export NLS_LANG=en_US.UTF-8
```
or as on most systems `LANG` should be available:
```
export NLS_LANG=$LANG
``` |
10447709 | Pass action as Parameter on Command Prompt (Linux) | 6 | 2012-05-04 11:13:29 | <p>I have written a program in linux bash and following are ways to start/stop that program:</p>
<pre><code>start_program
stop_program
restart_program.
</code></pre>
<p>I have copied above scripts in /usr/bin so these scripts are working as command. but I want that instead of above commands I just type program name t... | 3,721 | 1,287,633 | 2018-02-20 04:40:24 | 10,447,808 | 13 | 2012-05-04 11:20:26 | 111,644 | 2012-05-04 12:21:00 | https://stackoverflow.com/q/10447709 | https://stackoverflow.com/a/10447808 | <p>A common approach is to use a case statement:</p>
<pre><code>case "$1" in
start)
# Your Start Code
;;
stop)
# Your Stop Code
;;
restart)
# Your Restart Code
;;
*)
echo "Usage: $0 {start|stop|restart}" >&2
exit 1
;;
esac
</code></pre>
<p>If your <code>restart</code... | <p>A common approach is to use a case statement:</p> <pre><code>case "$1" in start) # Your Start Code ;; stop) # Your Stop Code ;; restart) # Your Restart Code ;; *) echo "Usage: $0 {start|stop|restart}" >&2 exit 1 ;; esac </code></pre> <p>If your <code>restart</code... | 58, 387, 390 | bash, linux, shell | <h1>Pass action as Parameter on Command Prompt (Linux)</h1>
<p>I have written a program in linux bash and following are ways to start/stop that program:</p>
<pre><code>start_program
stop_program
restart_program.
</code></pre>
<p>I have copied above scripts in /usr/bin so these scripts are working as command. but I wa... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,585 | bash | # Pass action as Parameter on Command Prompt (Linux)
I have written a program in linux bash and following are ways to start/stop that program:
```
start_program
stop_program
restart_program.
```
I have copied above scripts in /usr/bin so these scripts are working as command. but I want that instead of above commands... | A common approach is to use a case statement:
```
case "$1" in
start)
# Your Start Code
;;
stop)
# Your Stop Code
;;
restart)
# Your Restart Code
;;
*)
echo "Usage: $0 {start|stop|restart}" >&2
exit 1
;;
esac
```
If your `restart` is just `stop` then `start`, you can do:
`... |
9559582 | echo from lines of a file | 6 | 2012-03-04 22:48:50 | <p>i have a file "myfile.txt" that have the next content:</p>
<pre><code>hola mundo
hello word
</code></pre>
<p>and i want work with every line </p>
<pre><code>for i in `cat myfile.txt`; do echo $i; done
</code></pre>
<p>i hope this give me </p>
<pre><code>hola mundo
hello word
</code></pre>
<p>firts one line, th... | 27,911 | 614,662 | 2012-03-04 22:54:37 | 9,559,595 | 13 | 2012-03-04 22:51:36 | 55,925 | 2012-03-04 22:51:36 | https://stackoverflow.com/q/9559582 | https://stackoverflow.com/a/9559595 | <p>That's better</p>
<pre><code>cat myfile.txt | while read line; do
echo "$line"
done
</code></pre>
<p>or even better (doesn't launch other processes such as a subshell and <code>cat</code>):</p>
<pre><code>while read line; do
echo "$line"
done < myfile.txt
</code></pre>
<p>If you prefer oneliners, it's... | <p>That's better</p> <pre><code>cat myfile.txt | while read line; do echo "$line" done </code></pre> <p>or even better (doesn't launch other processes such as a subshell and <code>cat</code>):</p> <pre><code>while read line; do echo "$line" done < myfile.txt </code></pre> <p>If you prefer oneliners, it's... | 387, 13824, 22820 | bash, cat, echo | <h1>echo from lines of a file</h1>
<p>i have a file "myfile.txt" that have the next content:</p>
<pre><code>hola mundo
hello word
</code></pre>
<p>and i want work with every line </p>
<pre><code>for i in `cat myfile.txt`; do echo $i; done
</code></pre>
<p>i hope this give me </p>
<pre><code>hola mundo
hello word
<... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,586 | bash | # echo from lines of a file
i have a file "myfile.txt" that have the next content:
```
hola mundo
hello word
```
and i want work with every line
```
for i in `cat myfile.txt`; do echo $i; done
```
i hope this give me
```
hola mundo
hello word
```
firts one line, then the other, but get
```
hola
mundo
hello
word... | That's better
```
cat myfile.txt | while read line; do
echo "$line"
done
```
or even better (doesn't launch other processes such as a subshell and `cat`):
```
while read line; do
echo "$line"
done < myfile.txt
```
If you prefer oneliners, it's obviously
```
while read line; do echo "$line"; done < myfile.t... |
9265607 | mkdir command for a list of filenames paths | 6 | 2012-02-13 18:09:45 | <p>I have txt file with content like this</p>
<pre><code>/home/username/Desktop/folder/folder3333/IMAGw488.jpg
/home/username/Desktop/folder/folder3333/IMAG04f88.jpg
/home/username/Desktop/folder/folder3333/IMAGe0488.jpg
/home/username/Desktop/folder/folder3333/IMAG0r88.jpg
/home/username/Desktop/folder/folder3333/
/h... | 15,806 | 706,780 | 2014-07-10 20:04:34 | 9,265,932 | 13 | 2012-02-13 18:35:24 | 207,248 | 2012-02-13 18:40:45 | https://stackoverflow.com/q/9265607 | https://stackoverflow.com/a/9265932 | <p>This can be done in native <code>bash</code> syntax without any calls to external binaries:</p>
<pre><code>while read line; do mkdir -p "${line%/*}"; done < infile
</code></pre>
<p>Or perhaps with a just a single call to <code>mkdir</code> if you have <code>bash 4.x</code></p>
<pre><code>mapfile -t arr < in... | <p>This can be done in native <code>bash</code> syntax without any calls to external binaries:</p> <pre><code>while read line; do mkdir -p "${line%/*}"; done < infile </code></pre> <p>Or perhaps with a just a single call to <code>mkdir</code> if you have <code>bash 4.x</code></p> <pre><code>mapfile -t arr < in... | 58, 387, 390, 549 | bash, linux, shell, ubuntu | <h1>mkdir command for a list of filenames paths</h1>
<p>I have txt file with content like this</p>
<pre><code>/home/username/Desktop/folder/folder3333/IMAGw488.jpg
/home/username/Desktop/folder/folder3333/IMAG04f88.jpg
/home/username/Desktop/folder/folder3333/IMAGe0488.jpg
/home/username/Desktop/folder/folder3333/IMAG... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,587 | bash | # mkdir command for a list of filenames paths
I have txt file with content like this
```
/home/username/Desktop/folder/folder3333/IMAGw488.jpg
/home/username/Desktop/folder/folder3333/IMAG04f88.jpg
/home/username/Desktop/folder/folder3333/IMAGe0488.jpg
/home/username/Desktop/folder/folder3333/IMAG0r88.jpg
/home/usern... | This can be done in native `bash` syntax without any calls to external binaries:
```
while read line; do mkdir -p "${line%/*}"; done < infile
```
Or perhaps with a just a single call to `mkdir` if you have `bash 4.x`
```
mapfile -t arr < infile; mkdir -p "${arr[@]%/*}"
``` |
8915681 | Is there a command to return the owner of a file? | 6 | 2012-01-18 18:53:36 | <p>Is there a shell command to just print the owner of a file?</p>
<p>I guess I could just do:</p>
<pre><code>ls -l | awk '{print $3}'
</code></pre>
<p>but this feels like there would be a more straightforward answer to the problem.</p>
| 1,208 | 1,123,802 | 2012-01-18 19:15:40 | 8,915,705 | 13 | 2012-01-18 18:56:09 | 714,501 | 2012-01-18 18:56:09 | https://stackoverflow.com/q/8915681 | https://stackoverflow.com/a/8915705 | <p>Try using <code>stat(1)</code></p>
<pre><code>[cnicutar@fresh ~]$ stat -c %U file.c
cnicutar
</code></pre>
<p>There are lots of format sequences available: user ID, total size, etc.</p>
| <p>Try using <code>stat(1)</code></p> <pre><code>[cnicutar@fresh ~]$ stat -c %U file.c cnicutar </code></pre> <p>There are lots of format sequences available: user ID, total size, etc.</p> | 58, 390, 531 | linux, scripting, shell | <h1>Is there a command to return the owner of a file?</h1>
<p>Is there a shell command to just print the owner of a file?</p>
<p>I guess I could just do:</p>
<pre><code>ls -l | awk '{print $3}'
</code></pre>
<p>but this feels like there would be a more straightforward answer to the problem.</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,588 | bash | # Is there a command to return the owner of a file?
Is there a shell command to just print the owner of a file?
I guess I could just do:
```
ls -l | awk '{print $3}'
```
but this feels like there would be a more straightforward answer to the problem. | Try using `stat(1)`
```
[cnicutar@fresh ~]$ stat -c %U file.c
cnicutar
```
There are lots of format sequences available: user ID, total size, etc. |
7265790 | $SRCROOT not recognized in shell script attached to XCode project | 6 | 2011-09-01 03:15:50 | <p>Trying to run a simple script attached to my xcode project as follows...</p>
<pre><code>if [ -d '$HOME/data' ];
then
cd "$HOME/data/"
rsync -t *.plist '$SRCROOT/data/'
fi
exit 0
</code></pre>
<p>The script seems to run fine if I run it outside of XCode but when running from XCode I'm getting the following er... | 6,194 | 7,285 | 2011-09-01 15:57:44 | 7,273,012 | 13 | 2011-09-01 15:57:44 | 7,285 | 2011-09-01 15:57:44 | https://stackoverflow.com/q/7265790 | https://stackoverflow.com/a/7273012 | <p>Turns out this was my fault. The script was actually not being called at all. In XCode I was referring to the path of the script using...</p>
<pre><code>"./$(SRCROOT)/myScript.sh"
</code></pre>
<p>Switching it to...</p>
<pre><code>"$SRCROOT/myScript.sh"
</code></pre>
<p>Corrected the problem and indeed I can a... | <p>Turns out this was my fault. The script was actually not being called at all. In XCode I was referring to the path of the script using...</p> <pre><code>"./$(SRCROOT)/myScript.sh" </code></pre> <p>Switching it to...</p> <pre><code>"$SRCROOT/myScript.sh" </code></pre> <p>Corrected the problem and indeed I can a... | 390, 908 | shell, xcode | <h1>$SRCROOT not recognized in shell script attached to XCode project</h1>
<p>Trying to run a simple script attached to my xcode project as follows...</p>
<pre><code>if [ -d '$HOME/data' ];
then
cd "$HOME/data/"
rsync -t *.plist '$SRCROOT/data/'
fi
exit 0
</code></pre>
<p>The script seems to run fine if I run i... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,589 | bash | # $SRCROOT not recognized in shell script attached to XCode project
Trying to run a simple script attached to my xcode project as follows...
```
if [ -d '$HOME/data' ];
then
cd "$HOME/data/"
rsync -t *.plist '$SRCROOT/data/'
fi
exit 0
```
The script seems to run fine if I run it outside of XCode but when runni... | Turns out this was my fault. The script was actually not being called at all. In XCode I was referring to the path of the script using...
```
"./$(SRCROOT)/myScript.sh"
```
Switching it to...
```
"$SRCROOT/myScript.sh"
```
Corrected the problem and indeed I can access $SRCROOT from my script now. |
7198281 | Self-Deleting Script for both Linux Bash and Windows Batch | 6 | 2011-08-25 23:14:00 | <p>I have an uninstall script that cleans up an add-on tool used with an application.
Versions of the script run on both Windows and Linux.</p>
<p>I'd like to be able to delete the uninstall script file and also the directory in which the script runs too (in both the case of a Windows batch file and also for the case ... | 8,417 | 913,102 | 2017-01-20 18:16:01 | 7,198,324 | 13 | 2011-08-25 23:19:14 | 487,509 | 2017-01-20 18:16:01 | https://stackoverflow.com/q/7198281 | https://stackoverflow.com/a/7198324 | <p>In Bash, you can do</p>
<pre><code>#!/bin/bash
# do your uninstallation here
# ...
# and now remove the script
rm $0
# and the entire directory
rmdir `dirname $0`
</code></pre>
| <p>In Bash, you can do</p> <pre><code>#!/bin/bash # do your uninstallation here # ... # and now remove the script rm $0 # and the entire directory rmdir `dirname $0` </code></pre> | 64, 387, 7002, 24431 | bash, batch-file, self-destruction, windows | <h1>Self-Deleting Script for both Linux Bash and Windows Batch</h1>
<p>I have an uninstall script that cleans up an add-on tool used with an application.
Versions of the script run on both Windows and Linux.</p>
<p>I'd like to be able to delete the uninstall script file and also the directory in which the script runs ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,590 | bash | # Self-Deleting Script for both Linux Bash and Windows Batch
I have an uninstall script that cleans up an add-on tool used with an application.
Versions of the script run on both Windows and Linux.
I'd like to be able to delete the uninstall script file and also the directory in which the script runs too (in both the... | In Bash, you can do
```
#!/bin/bash
# do your uninstallation here
# ...
# and now remove the script
rm $0
# and the entire directory
rmdir `dirname $0`
``` |
6958982 | Shell script, saving the command value to a variable | 6 | 2011-08-05 15:43:28 | <p>I am trying to print the value of <code>VARI</code> in the same line followed by a comma, so that i can have a csv file of these values, but i m not able to save the value of
<code>VARI = 'cat filename | head -1 | cut -d, -f${i}'</code></p>
<pre><code>i=0
while (( i<130)) ;
do
if [[ $i -eq 1 || $i -eq 9 || ... | 9,890 | 794,403 | 2023-10-18 05:28:39 | 6,959,031 | 13 | 2011-08-05 15:47:44 | 112,968 | 2023-10-18 05:28:39 | https://stackoverflow.com/q/6958982 | https://stackoverflow.com/a/6959031 | <p>Use backticks (or <code>$()</code> which can be nested), not single quotes:</p>
<pre><code>VARI=`cat filename | head -1 | cut -d, -f${i}` # or:
VARI=$(cat filename | head -1 | cut -d, -f${i})
</code></pre>
<p>Make sure to not have spaces between the variable name, the equal sign, and the variable value.</p>
<pre><co... | <p>Use backticks (or <code>$()</code> which can be nested), not single quotes:</p> <pre><code>VARI=`cat filename | head -1 | cut -d, -f${i}` # or: VARI=$(cat filename | head -1 | cut -d, -f${i}) </code></pre> <p>Make sure to not have spaces between the variable name, the equal sign, and the variable value.</p> <pre><co... | 58, 390, 13824 | echo, linux, shell | <h1>Shell script, saving the command value to a variable</h1>
<p>I am trying to print the value of <code>VARI</code> in the same line followed by a comma, so that i can have a csv file of these values, but i m not able to save the value of
<code>VARI = 'cat filename | head -1 | cut -d, -f${i}'</code></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 | 10,591 | bash | # Shell script, saving the command value to a variable
I am trying to print the value of `VARI` in the same line followed by a comma, so that i can have a csv file of these values, but i m not able to save the value of
`VARI = 'cat filename | head -1 | cut -d, -f${i}'`
```
i=0
while (( i<130)) ;
do
if [[ $i -eq 1 |... | Use backticks (or `$()` which can be nested), not single quotes:
```
VARI=`cat filename | head -1 | cut -d, -f${i}` # or:
VARI=$(cat filename | head -1 | cut -d, -f${i})
```
Make sure to not have spaces between the variable name, the equal sign, and the variable value.
```
VAR = x # executes program "VAR" with 2 par... |
6197165 | Getting a PID from a Background Process Run as Another User | 6 | 2011-06-01 06:33:35 | <p>Getting a background process ID is easy to do from the prompt by going:</p>
<pre><code>$ my_daemon &
$ echo $!
</code></pre>
<p>But what if I want to run it as a different user like:</p>
<pre><code>su - joe -c "/path/to/my_daemon &;"
</code></pre>
<p>Now how can I capture the PID of my_daemon?</p>
| 7,529 | 148,390 | 2020-09-10 18:54:33 | 6,197,321 | 13 | 2011-06-01 06:51:29 | 15,168 | 2011-06-01 06:51:29 | https://stackoverflow.com/q/6197165 | https://stackoverflow.com/a/6197321 | <p>Succinctly - with a good deal of difficulty.</p>
<p>You have to arrange for the su'd shell to write the child PID to a file and then pick the output. Given that it will be 'joe' creating the file and not 'dex', that adds another layer of complexity.</p>
<p>The simplest solution is probably:</p>
<pre><code>su - j... | <p>Succinctly - with a good deal of difficulty.</p> <p>You have to arrange for the su'd shell to write the child PID to a file and then pick the output. Given that it will be 'joe' creating the file and not 'dex', that adds another layer of complexity.</p> <p>The simplest solution is probably:</p> <pre><code>su - j... | 387, 3300, 13784 | bash, pid, su | <h1>Getting a PID from a Background Process Run as Another User</h1>
<p>Getting a background process ID is easy to do from the prompt by going:</p>
<pre><code>$ my_daemon &
$ echo $!
</code></pre>
<p>But what if I want to run it as a different user like:</p>
<pre><code>su - joe -c "/path/to/my_daemon &;"
</c... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,592 | bash | # Getting a PID from a Background Process Run as Another User
Getting a background process ID is easy to do from the prompt by going:
```
$ my_daemon &
$ echo $!
```
But what if I want to run it as a different user like:
```
su - joe -c "/path/to/my_daemon &;"
```
Now how can I capture the PID of my_daemon? | Succinctly - with a good deal of difficulty.
You have to arrange for the su'd shell to write the child PID to a file and then pick the output. Given that it will be 'joe' creating the file and not 'dex', that adds another layer of complexity.
The simplest solution is probably:
```
su - joe -c "/path/to/my_daemon & e... |
4814006 | Can I assume bash is installed | 6 | 2011-01-27 08:08:30 | <p>I have a cross platform product that gets deployed to several Linux distros and I'm busy changing one of its startup scripts. Currently the script uses /bin/sh as interpreter. My question is. How safe am I if I change this to /bin/bash, will there be some cases that bash is not installed or something. Why does all t... | 3,113 | 45,390 | 2011-08-30 09:02:44 | 4,814,062 | 13 | 2011-01-27 08:19:44 | 207,248 | 2011-01-27 08:19:44 | https://stackoverflow.com/q/4814006 | https://stackoverflow.com/a/4814062 | <blockquote>
<p>Can I assume bash is installed</p>
</blockquote>
<p>If portability is a goal, you would be doing yourself a disservice to assume <code>bash</code> was installed. That is not to say that <code>bash</code> won't be installed 99% of the time, but it's the 1% that gets ya. </p>
<blockquote>
<p>How s... | <blockquote> <p>Can I assume bash is installed</p> </blockquote> <p>If portability is a goal, you would be doing yourself a disservice to assume <code>bash</code> was installed. That is not to say that <code>bash</code> won't be installed 99% of the time, but it's the 1% that gets ya. </p> <blockquote> <p>How s... | 58, 387, 1012 | bash, debian, linux | <h1>Can I assume bash is installed</h1>
<p>I have a cross platform product that gets deployed to several Linux distros and I'm busy changing one of its startup scripts. Currently the script uses /bin/sh as interpreter. My question is. How safe am I if I change this to /bin/bash, will there be some cases that bash is no... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,593 | bash | # Can I assume bash is installed
I have a cross platform product that gets deployed to several Linux distros and I'm busy changing one of its startup scripts. Currently the script uses /bin/sh as interpreter. My question is. How safe am I if I change this to /bin/bash, will there be some cases that bash is not install... | > Can I assume bash is installed
If portability is a goal, you would be doing yourself a disservice to assume `bash` was installed. That is not to say that `bash` won't be installed 99% of the time, but it's the 1% that gets ya.
> How safe am I if I change this to /bin/bash, will there be some cases that bash is not ... |
4346947 | How can I change where unix pipe sends its results for the split command? | 6 | 2010-12-03 15:22:34 | <p>Basically I'm doing this:</p>
<pre><code>export_something | split -b 1000
</code></pre>
<p>which splits the results of the export into files names xaa, xab, xac all 1000 bytes each</p>
<p>but I want my output from split to go into files with a specific-prefix. Ordinarily I'd just do this:</p>
<pre><code>split -b... | 4,316 | 18,818 | 2010-12-03 15:26:50 | 4,346,974 | 13 | 2010-12-03 15:25:55 | 514,460 | 2010-12-03 15:25:55 | https://stackoverflow.com/q/4346947 | https://stackoverflow.com/a/4346974 | <p>Yes, <code>-</code> is commonly used to denote stdin or stdout, whichever makes more sense. In your example</p>
<pre><code>export_something | split -b 1000 - <prefix>
</code></pre>
| <p>Yes, <code>-</code> is commonly used to denote stdin or stdout, whichever makes more sense. In your example</p> <pre><code>export_something | split -b 1000 - <prefix> </code></pre> | 34, 387, 390, 5813 | bash, pipe, shell, unix | <h1>How can I change where unix pipe sends its results for the split command?</h1>
<p>Basically I'm doing this:</p>
<pre><code>export_something | split -b 1000
</code></pre>
<p>which splits the results of the export into files names xaa, xab, xac all 1000 bytes each</p>
<p>but I want my output from split to go into ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,594 | bash | # How can I change where unix pipe sends its results for the split command?
Basically I'm doing this:
```
export_something | split -b 1000
```
which splits the results of the export into files names xaa, xab, xac all 1000 bytes each
but I want my output from split to go into files with a specific-prefix. Ordinarily... | Yes, `-` is commonly used to denote stdin or stdout, whichever makes more sense. In your example
```
export_something | split -b 1000 - <prefix>
``` |
3869102 | Putty closes on executing bash script | 6 | 2010-10-06 02:21:33 | <p>I am writing my first ever bash script, so excuse the noobie-ness. </p>
<p>It's called hello.bash, and this is what it contains:</p>
<pre><code>#!/bin/bash
echo Hello World
</code></pre>
<p>I did </p>
<pre><code>chmod 700 hello.bash
</code></pre>
<p>to give myself permissions to execute.</p>
<p>Now, when I typ... | 3,259 | 315,828 | 2010-10-06 02:28:45 | 3,869,131 | 13 | 2010-10-06 02:28:45 | 2,611 | 2010-10-06 02:28:45 | https://stackoverflow.com/q/3869102 | https://stackoverflow.com/a/3869131 | <p>From the <a href="http://ss64.com/bash/exec.html" rel="noreferrer">man page</a> for exec:</p>
<blockquote>
<p>If command is supplied, it replaces the shell without creating a new process. If no command is specified, redirections may be used to affect the current shell environment.</p>
</blockquote>
<p>So your sc... | <p>From the <a href="http://ss64.com/bash/exec.html" rel="noreferrer">man page</a> for exec:</p> <blockquote> <p>If command is supplied, it replaces the shell without creating a new process. If no command is specified, redirections may be used to affect the current shell environment.</p> </blockquote> <p>So your sc... | 387, 1768 | bash, putty | <h1>Putty closes on executing bash script</h1>
<p>I am writing my first ever bash script, so excuse the noobie-ness. </p>
<p>It's called hello.bash, and this is what it contains:</p>
<pre><code>#!/bin/bash
echo Hello World
</code></pre>
<p>I did </p>
<pre><code>chmod 700 hello.bash
</code></pre>
<p>to give myself ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,595 | bash | # Putty closes on executing bash script
I am writing my first ever bash script, so excuse the noobie-ness.
It's called hello.bash, and this is what it contains:
```
#!/bin/bash
echo Hello World
```
I did
```
chmod 700 hello.bash
```
to give myself permissions to execute.
Now, when I type
```
exec hello.bash
```... | From the [man page](http://ss64.com/bash/exec.html) for exec:
> If command is supplied, it replaces the shell without creating a new process. If no command is specified, redirections may be used to affect the current shell environment.
So your script process runs in place of your terminal and when it exits, so does y... |
3814097 | Declaring User Defined Variable in Shell Scripting (csh shell) | 6 | 2010-09-28 15:00:12 | <p>I am trying to learn shell scripting and trying to create a user defined variable within the script, <code>first</code>:</p>
<pre><code>howdy="Hello $USER !"
echo $howdy
</code></pre>
<p>However, when I execute the script (<code>./first</code>) I get this:</p>
<pre><code>howdy=Hello aaron!: Command not found.
how... | 50,221 | 363,829 | 2016-08-19 13:04:27 | 3,814,245 | 13 | 2010-09-28 15:15:34 | 45,318 | 2016-08-19 13:04:27 | https://stackoverflow.com/q/3814097 | https://stackoverflow.com/a/3814245 | <p>You have two errors in you code:</p>
<ol>
<li>you are using sh syntax instead of csh one to set the variable</li>
<li>you are not escaping the "!" character (history substitution)</li>
</ol>
<p>Try this:</p>
<pre><code>#!/bin/csh
set howdy="Hello $USER \!"
echo $howdy
</code></pre>
| <p>You have two errors in you code:</p> <ol> <li>you are using sh syntax instead of csh one to set the variable</li> <li>you are not escaping the "!" character (history substitution)</li> </ol> <p>Try this:</p> <pre><code>#!/bin/csh set howdy="Hello $USER \!" echo $howdy </code></pre> | 58, 390, 2829 | csh, linux, shell | <h1>Declaring User Defined Variable in Shell Scripting (csh shell)</h1>
<p>I am trying to learn shell scripting and trying to create a user defined variable within the script, <code>first</code>:</p>
<pre><code>howdy="Hello $USER !"
echo $howdy
</code></pre>
<p>However, when I execute the script (<code>./first</code>... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,596 | bash | # Declaring User Defined Variable in Shell Scripting (csh shell)
I am trying to learn shell scripting and trying to create a user defined variable within the script, `first`:
```
howdy="Hello $USER !"
echo $howdy
```
However, when I execute the script (`./first`) I get this:
```
howdy=Hello aaron!: Command not foun... | You have two errors in you code:
1. you are using sh syntax instead of csh one to set the variable
2. you are not escaping the "!" character (history substitution)
Try this:
```
#!/bin/csh
set howdy="Hello $USER \!"
echo $howdy
``` |
2987625 | How can I access windows file preview icons from my WPF application | 6 | 2010-06-07 07:04:35 | <p>I got a bunch of Pictures and Videos in a directory and needs to be displayed in the WPF application, I am thinking about displaying the Win7 Large Icon itself as the preview image. Because that will save me the work of grabbing an appropriate frame from the video file since Windows is doing that job pretty well alr... | 4,974 | 8,091 | 2018-03-07 09:55:13 | 2,994,451 | 13 | 2010-06-08 02:33:45 | 130,689 | 2018-03-07 09:55:13 | https://stackoverflow.com/q/2987625 | https://stackoverflow.com/a/2994451 | <p>When using the <a href="https://github.com/contre/Windows-API-Code-Pack-1.1" rel="nofollow noreferrer">Windows API Code Pack</a>, you can do:</p>
<p>XAML</p>
<pre><code> <Image x:Name="img" />
</code></pre>
<p>C#</p>
<pre><code> img.Source = ShellFile.FromFilePath(@"C:\path\to\file.ext").Thumbnail.BitmapSo... | <p>When using the <a href="https://github.com/contre/Windows-API-Code-Pack-1.1" rel="nofollow noreferrer">Windows API Code Pack</a>, you can do:</p> <p>XAML</p> <pre><code> <Image x:Name="img" /> </code></pre> <p>C#</p> <pre><code> img.Source = ShellFile.FromFilePath(@"C:\path\to\file.ext").Thumbnail.BitmapSo... | 378, 8123, 8421 | thumbnails, windows-shell, wpf | <h1>How can I access windows file preview icons from my WPF application</h1>
<p>I got a bunch of Pictures and Videos in a directory and needs to be displayed in the WPF application, I am thinking about displaying the Win7 Large Icon itself as the preview image. Because that will save me the work of grabbing an appropri... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,597 | bash | # How can I access windows file preview icons from my WPF application
I got a bunch of Pictures and Videos in a directory and needs to be displayed in the WPF application, I am thinking about displaying the Win7 Large Icon itself as the preview image. Because that will save me the work of grabbing an appropriate frame... | When using the [Windows API Code Pack](https://github.com/contre/Windows-API-Code-Pack-1.1), you can do:
XAML
```
<Image x:Name="img" />
```
C#
```
img.Source = ShellFile.FromFilePath(@"C:\path\to\file.ext").Thumbnail.BitmapSource;
```
This requires adding the [`Microsoft-WindowsAPICodePack-Shell`](https://www.n... |
2786102 | GUNZIP / Extract file "portion by portion" | 6 | 2010-05-07 03:56:47 | <p>I'm on a shared server with restricted disk space and i've got a gz file that super expands into a HUGE file, more than what i've got. How can I extract it "portion" by "portion (lets say 10 MB at a time), and process each portion, without extracting the whole thing even temporarily!</p>
<p>No, this is just ONE sup... | 2,876 | 1,154,992 | 2010-05-07 05:53:54 | 2,786,159 | 13 | 2010-05-07 04:14:37 | 275,737 | 2010-05-07 04:14:37 | https://stackoverflow.com/q/2786102 | https://stackoverflow.com/a/2786159 | <p>If you're doing this with (Unix/Linux) shell tools, you can use <code>gunzip -c</code> to uncompress to stdout, then use <code>dd</code> with the <code>skip</code> and <code>count</code> options to copy only one chunk.</p>
<p>For example:</p>
<pre><code>gunzip -c input.gz | dd bs=10485760 skip=0 count=1 >output... | <p>If you're doing this with (Unix/Linux) shell tools, you can use <code>gunzip -c</code> to uncompress to stdout, then use <code>dd</code> with the <code>skip</code> and <code>count</code> options to copy only one chunk.</p> <p>For example:</p> <pre><code>gunzip -c input.gz | dd bs=10485760 skip=0 count=1 >output... | 76, 390, 1930, 26457 | compression, gunzip, gzip, shell | <h1>GUNZIP / Extract file "portion by portion"</h1>
<p>I'm on a shared server with restricted disk space and i've got a gz file that super expands into a HUGE file, more than what i've got. How can I extract it "portion" by "portion (lets say 10 MB at a time), and process each portion, without extracting the whole thin... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,598 | bash | # GUNZIP / Extract file "portion by portion"
I'm on a shared server with restricted disk space and i've got a gz file that super expands into a HUGE file, more than what i've got. How can I extract it "portion" by "portion (lets say 10 MB at a time), and process each portion, without extracting the whole thing even te... | If you're doing this with (Unix/Linux) shell tools, you can use `gunzip -c` to uncompress to stdout, then use `dd` with the `skip` and `count` options to copy only one chunk.
For example:
```
gunzip -c input.gz | dd bs=10485760 skip=0 count=1 >output
```
then skip=1, skip=2, etc. |
2330014 | Is there a simple way in linux to strip a website of text from command line? | 6 | 2010-02-24 22:12:28 | <p>I've been searching for a command line tool that would turn html code into just the text that would appear on the site... so it would be equivalent to in a web browser selecting everything and then pasting it into a text editor...</p>
<p>Anyone know of something in Ubuntu that would do this? I'm trying to write a ... | 4,006 | 110,797 | 2010-02-24 22:22:04 | 2,330,038 | 13 | 2010-02-24 22:15:57 | 20,862 | 2010-02-24 22:15:57 | https://stackoverflow.com/q/2330014 | https://stackoverflow.com/a/2330038 | <pre><code>lynx -dump http://example.com/
</code></pre>
| <pre><code>lynx -dump http://example.com/ </code></pre> | 2, 58, 387, 1357 | bash, html, linux, parsing | <h1>Is there a simple way in linux to strip a website of text from command line?</h1>
<p>I've been searching for a command line tool that would turn html code into just the text that would appear on the site... so it would be equivalent to in a web browser selecting everything and then pasting it into a text editor...<... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,599 | bash | # Is there a simple way in linux to strip a website of text from command line?
I've been searching for a command line tool that would turn html code into just the text that would appear on the site... so it would be equivalent to in a web browser selecting everything and then pasting it into a text editor...
Anyone k... | ```
lynx -dump http://example.com/
``` |
628277 | Is there a shell command to recursively give permission to directories and files? | 6 | 2009-03-09 22:27:28 | <p>Can someone please give me a recursive command that will go through a directory and make all normal files permission 644 and all sub directories 755?</p>
<p>I am really getting tired of doing this manually every time I have to install something on my host. I don't know enough BASH (Shell?) command to do this.</p>
| 6,327 | 51,649 | 2009-03-09 22:50:16 | 628,285 | 13 | 2009-03-09 22:30:17 | 12,547 | 2009-03-09 22:38:27 | https://stackoverflow.com/q/628277 | https://stackoverflow.com/a/628285 | <p>First line changes file permissions, and the second changes directory permissions in the active directory and its subdirectories.</p>
<pre><code>find . -type f -print0 | xargs -0 chmod 644
find . -type d -print0 | xargs -0 chmod 755
</code></pre>
| <p>First line changes file permissions, and the second changes directory permissions in the active directory and its subdirectories.</p> <pre><code>find . -type f -print0 | xargs -0 chmod 644 find . -type d -print0 | xargs -0 chmod 755 </code></pre> | 387, 390, 1231 | bash, command-line, shell | <h1>Is there a shell command to recursively give permission to directories and files?</h1>
<p>Can someone please give me a recursive command that will go through a directory and make all normal files permission 644 and all sub directories 755?</p>
<p>I am really getting tired of doing this manually every time I have t... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,600 | bash | # Is there a shell command to recursively give permission to directories and files?
Can someone please give me a recursive command that will go through a directory and make all normal files permission 644 and all sub directories 755?
I am really getting tired of doing this manually every time I have to install someth... | First line changes file permissions, and the second changes directory permissions in the active directory and its subdirectories.
```
find . -type f -print0 | xargs -0 chmod 644
find . -type d -print0 | xargs -0 chmod 755
``` |
19122755 | Output ("echo") a variable to a text file | 69 | 2013-10-01 17:53:27 | <p>I'm running a PowerShell script against many servers, and it is logging output to a text file.</p>
<p>I'd like to capture the server the script is currently running on. So far I have:</p>
<pre><code>$file = "\\server\share\file.txt"
$computername = $env:computername
$computername | Add-Content -Path $file
</code>... | 275,404 | 1,483,127 | 2025-02-16 03:07:29 | 19,123,018 | 12 | 2013-10-01 18:11:23 | 1,483,127 | 2017-05-28 22:16:33 | https://stackoverflow.com/q/19122755 | https://stackoverflow.com/a/19123018 | <p>After some trial and error, I found that</p>
<pre><code>$computername = $env:computername
</code></pre>
<p>works to get a computer name, but sending <code>$computername</code> to a file via <a href="http://technet.microsoft.com/en-us/library/hh849859.aspx" rel="noreferrer">Add-Content</a> doesn't work.</p>
<p>I a... | <p>After some trial and error, I found that</p> <pre><code>$computername = $env:computername </code></pre> <p>works to get a computer name, but sending <code>$computername</code> to a file via <a href="http://technet.microsoft.com/en-us/library/hh849859.aspx" rel="noreferrer">Add-Content</a> doesn't work.</p> <p>I a... | 526, 724 | file-io, powershell | <h1>Output ("echo") a variable to a text file</h1>
<p>I'm running a PowerShell script against many servers, and it is logging output to a text file.</p>
<p>I'd like to capture the server the script is currently running on. So far I have:</p>
<pre><code>$file = "\\server\share\file.txt"
$computername = $env:computerna... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,601 | bash | # Output ("echo") a variable to a text file
I'm running a PowerShell script against many servers, and it is logging output to a text file.
I'd like to capture the server the script is currently running on. So far I have:
```
$file = "\\server\share\file.txt"
$computername = $env:computername
$computername | Add-Con... | After some trial and error, I found that
```
$computername = $env:computername
```
works to get a computer name, but sending `$computername` to a file via [Add-Content](http://technet.microsoft.com/en-us/library/hh849859.aspx) doesn't work.
I also tried `$computername.Value`.
Instead, if I use
```
$computername = ... |
29688115 | How do I check if an environment variable is set in cmake | 53 | 2015-04-17 00:15:52 | <p>I set an environment variable in my bash profile, so I can see it in the terminal just fine . .</p>
<blockquote>
<p>blah/builds$ echo $THING</p>
<p>thingy</p>
</blockquote>
<p>How do I display it in a cmake message and check if it is set? I have tried the following, but it just displays thing as blank and skips the ... | 69,499 | 276,193 | 2019-07-31 11:03:47 | 32,904,761 | 12 | 2015-10-02 09:55:00 | 396,967 | 2015-10-02 09:55:00 | https://stackoverflow.com/q/29688115 | https://stackoverflow.com/a/32904761 | <p>You CMake code is correct. The problem is most likely that you only <em>set</em> the environment variable in your shell but did not <em>export</em> it. Run the following before invoking <code>cmake</code>:</p>
<pre><code>export THING
</code></pre>
| <p>You CMake code is correct. The problem is most likely that you only <em>set</em> the environment variable in your shell but did not <em>export</em> it. Run the following before invoking <code>cmake</code>:</p> <pre><code>export THING </code></pre> | 387, 8822, 9013 | bash, cmake, environment-variables | <h1>How do I check if an environment variable is set in cmake</h1>
<p>I set an environment variable in my bash profile, so I can see it in the terminal just fine . .</p>
<blockquote>
<p>blah/builds$ echo $THING</p>
<p>thingy</p>
</blockquote>
<p>How do I display it in a cmake message and check if it is set? I have trie... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,602 | bash | # How do I check if an environment variable is set in cmake
I set an environment variable in my bash profile, so I can see it in the terminal just fine . .
> blah/builds$ echo $THING
>
> thingy
How do I display it in a cmake message and check if it is set? I have tried the following, but it just displays thing as bl... | You CMake code is correct. The problem is most likely that you only *set* the environment variable in your shell but did not *export* it. Run the following before invoking `cmake`:
```
export THING
``` |
15293406 | Install zsh without root access? | 49 | 2013-03-08 11:54:23 | <p>Is it possible (and how)? I really need this for several remote computers where I've got ssh access (but no root access).</p>
| 37,531 | 1,444,689 | 2019-03-01 16:15:51 | 15,293,550 | 12 | 2013-03-08 12:00:28 | 1,416,629 | 2013-03-08 12:03:32 | https://stackoverflow.com/q/15293406 | https://stackoverflow.com/a/15293550 | <p>You can try the <code>chsh</code> command. Are you sure zsh isn't installed on the distant computer? If not, you can do this (quoted from <a href="http://zsh.sourceforge.net/FAQ/zshfaq01.html" rel="noreferrer">zsh FAQ Section 1.7</a>)</p>
<p>The basic idea is to use exec to replace the current shell with zsh. Ofte... | <p>You can try the <code>chsh</code> command. Are you sure zsh isn't installed on the distant computer? If not, you can do this (quoted from <a href="http://zsh.sourceforge.net/FAQ/zshfaq01.html" rel="noreferrer">zsh FAQ Section 1.7</a>)</p> <p>The basic idea is to use exec to replace the current shell with zsh. Ofte... | 58, 387, 390, 391, 3791 | bash, linux, shell, terminal, zsh | <h1>Install zsh without root access?</h1>
<p>Is it possible (and how)? I really need this for several remote computers where I've got ssh access (but no root access).</p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,603 | bash | # Install zsh without root access?
Is it possible (and how)? I really need this for several remote computers where I've got ssh access (but no root access). | You can try the `chsh` command. Are you sure zsh isn't installed on the distant computer? If not, you can do this (quoted from [zsh FAQ Section 1.7](http://zsh.sourceforge.net/FAQ/zshfaq01.html))
The basic idea is to use exec to replace the current shell with zsh. Often you can do this in a login file such as .profile... |
967443 | Python module to shellquote/unshellquote? | 39 | 2009-06-08 22:56:09 | <p>Is there anything in the Python standard library that will properly parse/unparse strings for using in shell commands? I'm looking for the python analog to perl's <code>String::ShellQuote::shell_quote</code>:</p>
<pre><code>$ print String::ShellQuote::shell_quote("hello", "stack", "overflow's", "quite", "cool")
hel... | 20,066 | 54,873 | 2015-01-26 08:59:18 | 25,147,580 | 12 | 2014-08-05 20:19:03 | 1,733,117 | 2014-08-05 20:19:03 | https://stackoverflow.com/q/967443 | https://stackoverflow.com/a/25147580 | <p><code>pipes.quote</code> is now <code>shlex.quote</code> in python 3.
It is easy enough to use that piece of code.</p>
<p><a href="https://github.com/python/cpython/blob/master/Lib/shlex.py#L281" rel="noreferrer">https://github.com/python/cpython/blob/master/Lib/shlex.py#L281</a></p>
<p>That version handles zero-l... | <p><code>pipes.quote</code> is now <code>shlex.quote</code> in python 3. It is easy enough to use that piece of code.</p> <p><a href="https://github.com/python/cpython/blob/master/Lib/shlex.py#L281" rel="noreferrer">https://github.com/python/cpython/blob/master/Lib/shlex.py#L281</a></p> <p>That version handles zero-l... | 16, 390, 10804 | python, quoting, shell | <h1>Python module to shellquote/unshellquote?</h1>
<p>Is there anything in the Python standard library that will properly parse/unparse strings for using in shell commands? I'm looking for the python analog to perl's <code>String::ShellQuote::shell_quote</code>:</p>
<pre><code>$ print String::ShellQuote::shell_quote("... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,604 | bash | # Python module to shellquote/unshellquote?
Is there anything in the Python standard library that will properly parse/unparse strings for using in shell commands? I'm looking for the python analog to perl's `String::ShellQuote::shell_quote`:
```
$ print String::ShellQuote::shell_quote("hello", "stack", "overflow's", ... | `pipes.quote` is now `shlex.quote` in python 3.
It is easy enough to use that piece of code.
<https://github.com/python/cpython/blob/master/Lib/shlex.py#L281>
That version handles zero-length argument correctly. |
22080937 | Skip blank lines when iterating through file line by line | 38 | 2014-02-27 21:33:53 | <p>I am iterating through a file line by line and put each word into a array and that works. But it also picks up blank lines and puts it as an item in the array, how can I skip the blank lines?</p>
<p>example file</p>
<pre><code> Line 1
line 2
line 3
line 4
line 5
line 6
</code></pre>
<p>My code</p... | 86,744 | 3,338,990 | 2024-09-30 00:06:04 | 22,081,036 | 12 | 2014-02-27 21:38:42 | 1,323,940 | 2014-02-28 06:52:19 | https://stackoverflow.com/q/22080937 | https://stackoverflow.com/a/22081036 | <p>Remove the blank lines first with <code>sed</code>.</p>
<pre><code>for word in `sed '/^$/d' $inputfile`; do
myarray[$index]="$word"
index=$(($index+1))
done
</code></pre>
| <p>Remove the blank lines first with <code>sed</code>.</p> <pre><code>for word in `sed '/^$/d' $inputfile`; do myarray[$index]="$word" index=$(($index+1)) done </code></pre> | 387 | bash | <h1>Skip blank lines when iterating through file line by line</h1>
<p>I am iterating through a file line by line and put each word into a array and that works. But it also picks up blank lines and puts it as an item in the array, how can I skip the blank lines?</p>
<p>example file</p>
<pre><code> Line 1
line 2
l... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,605 | bash | # Skip blank lines when iterating through file line by line
I am iterating through a file line by line and put each word into a array and that works. But it also picks up blank lines and puts it as an item in the array, how can I skip the blank lines?
example file
```
Line 1
line 2
line 3
line 4
lin... | Remove the blank lines first with `sed`.
```
for word in `sed '/^$/d' $inputfile`; do
myarray[$index]="$word"
index=$(($index+1))
done
``` |
6387907 | Whether to escape ( and ) in regex using GNU sed | 37 | 2011-06-17 15:13:16 | <p>I've noticed several posts on this site which say that with gnu sed you should use <code>(</code> and <code>)</code> in regex rather than <code>\(</code> and <code>\)</code>. But then I looked in the <a href="http://www.gnu.org/software/sed/manual/sed.html#The-_0022s_0022-Command" rel="noreferrer">gnu sed manual</a... | 33,938 | 749,668 | 2023-03-14 20:29:59 | 6,390,351 | 12 | 2011-06-17 18:46:38 | 749,668 | 2011-06-17 18:46:38 | https://stackoverflow.com/q/6387907 | https://stackoverflow.com/a/6390351 | <p>Thanks to rocker, murga, and chris. Each of you helped me understand the issue. I'm answering my own question here in order to (hopefully) put the whole story together in one place.</p>
<p>There are two major versions of sed in use: gnu and bsd. Both of them require parens in basic regex to be escaped when used ... | <p>Thanks to rocker, murga, and chris. Each of you helped me understand the issue. I'm answering my own question here in order to (hopefully) put the whole story together in one place.</p> <p>There are two major versions of sed in use: gnu and bsd. Both of them require parens in basic regex to be escaped when used ... | 18, 387, 4072, 5282 | bash, gnu, regex, sed | <h1>Whether to escape ( and ) in regex using GNU sed</h1>
<p>I've noticed several posts on this site which say that with gnu sed you should use <code>(</code> and <code>)</code> in regex rather than <code>\(</code> and <code>\)</code>. But then I looked in the <a href="http://www.gnu.org/software/sed/manual/sed.html#T... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,606 | bash | # Whether to escape ( and ) in regex using GNU sed
I've noticed several posts on this site which say that with gnu sed you should use `(` and `)` in regex rather than `\(` and `\)`. But then I looked in the [gnu sed manual](http://www.gnu.org/software/sed/manual/sed.html#The-_0022s_0022-Command) and saw that they spec... | Thanks to rocker, murga, and chris. Each of you helped me understand the issue. I'm answering my own question here in order to (hopefully) put the whole story together in one place.
There are two major versions of sed in use: gnu and bsd. Both of them require parens in basic regex to be escaped when used for grouping ... |
14765569 | How to test if multiple files exist using a Bash script | 32 | 2013-02-08 04:15:27 | <p>How can I use the <code>test</code> command for an arbitrary number of files, passed in using an argument with a wildcard?</p>
<p>For example:</p>
<pre><code>test -f /var/log/apache2/access.log.* && echo "exists one or more files"
</code></pre>
<p>Currently, it prints</p>
<pre><code>error: bash: te... | 93,973 | 526,444 | 2024-06-01 02:01:19 | 14,765,676 | 12 | 2013-02-08 04:27:46 | 844,759 | 2022-04-08 22:00:07 | https://stackoverflow.com/q/14765569 | https://stackoverflow.com/a/14765676 | <p>To avoid "too many arguments error", you need <code>xargs</code>. Unfortunately, <code>test -f</code> doesn't support multiple files. The following one-liner should work:</p>
<pre><code>for i in /var/log/apache2/access.log.*; do test -f "$i" && echo "exists one or more files" &a... | <p>To avoid "too many arguments error", you need <code>xargs</code>. Unfortunately, <code>test -f</code> doesn't support multiple files. The following one-liner should work:</p> <pre><code>for i in /var/log/apache2/access.log.*; do test -f "$i" && echo "exists one or more files" &a... | 387 | bash | <h1>How to test if multiple files exist using a Bash script</h1>
<p>How can I use the <code>test</code> command for an arbitrary number of files, passed in using an argument with a wildcard?</p>
<p>For example:</p>
<pre><code>test -f /var/log/apache2/access.log.* && echo "exists one or more files"
</c... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,607 | bash | # How to test if multiple files exist using a Bash script
How can I use the `test` command for an arbitrary number of files, passed in using an argument with a wildcard?
For example:
```
test -f /var/log/apache2/access.log.* && echo "exists one or more files"
```
Currently, it prints
```
error: bash: test: too man... | To avoid "too many arguments error", you need `xargs`. Unfortunately, `test -f` doesn't support multiple files. The following one-liner should work:
```
for i in /var/log/apache2/access.log.*; do test -f "$i" && echo "exists one or more files" && break; done
```
By the way, `/var/log/apache2/access.log.*` is called s... |
22464786 | Ignoring Bash pipefail for error code 141 | 31 | 2014-03-17 20:35:08 | <p>Setting the bash <code>pipefail</code> option (via <code>set -o pipefail</code>) allows the script to fail if a non-zero error is caught where there is a non-zero error in any step of a pipe.</p>
<p>However, we are running into <code>SIGPIPE</code> errors (error code 141), where data is written to a pipe that no lo... | 16,665 | 19,410 | 2022-11-15 12:21:03 | 22,464,942 | 12 | 2014-03-17 20:43:13 | 1,126,841 | 2014-03-17 20:43:13 | https://stackoverflow.com/q/22464786 | https://stackoverflow.com/a/22464942 | <p>The <code>trap</code> command lets you specify a command to run when encountering a signal. To ignore a signal, pass the empty string:</p>
<pre><code>trap '' PIPE
</code></pre>
| <p>The <code>trap</code> command lets you specify a command to run when encountering a signal. To ignore a signal, pass the empty string:</p> <pre><code>trap '' PIPE </code></pre> | 16, 379, 387, 2481, 7615 | bash, error-handling, python, signals, sigpipe | <h1>Ignoring Bash pipefail for error code 141</h1>
<p>Setting the bash <code>pipefail</code> option (via <code>set -o pipefail</code>) allows the script to fail if a non-zero error is caught where there is a non-zero error in any step of a pipe.</p>
<p>However, we are running into <code>SIGPIPE</code> errors (error co... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,608 | bash | # Ignoring Bash pipefail for error code 141
Setting the bash `pipefail` option (via `set -o pipefail`) allows the script to fail if a non-zero error is caught where there is a non-zero error in any step of a pipe.
However, we are running into `SIGPIPE` errors (error code 141), where data is written to a pipe that no ... | The `trap` command lets you specify a command to run when encountering a signal. To ignore a signal, pass the empty string:
```
trap '' PIPE
``` |
972370 | How do you pipe input through grep to another utility? | 28 | 2009-06-09 20:40:05 | <p>I am using 'tail -f' to follow a log file as it's updated; next I pipe the output of that to grep to show only the lines containing a search term ("org.springframework" in this case); finally I'd like to make is piping the output from grep to a third command, 'cut':</p>
<pre><code>tail -f logfile | grep org.springf... | 37,506 | 39,489 | 2015-10-19 13:48:51 | 978,178 | 12 | 2009-06-10 21:12:49 | 26,428 | 2009-06-10 21:12:49 | https://stackoverflow.com/q/972370 | https://stackoverflow.com/a/978178 | <p>On my system, about 8K was buffered before I got any output. This sequence worked to follow the file immediately:</p>
<pre><code>tail -f logfile | while read line ; do echo "$line"| grep 'org.springframework'|cut -c 25- ; done
</code></pre>
| <p>On my system, about 8K was buffered before I got any output. This sequence worked to follow the file immediately:</p> <pre><code>tail -f logfile | while read line ; do echo "$line"| grep 'org.springframework'|cut -c 25- ; done </code></pre> | 387, 1271, 1731, 4257, 5813 | bash, cut, cygwin, grep, pipe | <h1>How do you pipe input through grep to another utility?</h1>
<p>I am using 'tail -f' to follow a log file as it's updated; next I pipe the output of that to grep to show only the lines containing a search term ("org.springframework" in this case); finally I'd like to make is piping the output from grep to a third co... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,610 | bash | # How do you pipe input through grep to another utility?
I am using 'tail -f' to follow a log file as it's updated; next I pipe the output of that to grep to show only the lines containing a search term ("org.springframework" in this case); finally I'd like to make is piping the output from grep to a third command, 'c... | On my system, about 8K was buffered before I got any output. This sequence worked to follow the file immediately:
```
tail -f logfile | while read line ; do echo "$line"| grep 'org.springframework'|cut -c 25- ; done
``` |
20705102 | How to colorise PowerShell output of Format-Table | 27 | 2013-12-20 13:50:36 | <p>I try to colorise the column RAM in red if the value is greater than 100 MB:</p>
<pre><code>Get-Process | Format-Table @{ Label = "PID"; Expression={$_.Id}},
@{ Label = "Name"; Expression={$_.Name}},
@{ Label = "RAM (MB)"; Expression={[System.Math]::Round($_.WS/1MB, 1)}},
@{ Labe... | 49,393 | 1,911,082 | 2024-08-08 22:02:59 | 20,707,761 | 12 | 2013-12-20 16:19:32 | 2,517,150 | 2018-07-23 18:42:52 | https://stackoverflow.com/q/20705102 | https://stackoverflow.com/a/20707761 | <h2>You could colorize <em>the row</em> making use of a regular expression...</h2>
<pre><code>filter colorize-row{
Get-Process | Select-Object Id, Name, WS, Responding | foreach {
# Print 'red' row if WS greater than 100 MB
if([System.Math]::Round($_.WS/1MB,1) -match "^([0-9]|[0-9][0-9]|[1-9][0-9... | <h2>You could colorize <em>the row</em> making use of a regular expression...</h2> <pre><code>filter colorize-row{ Get-Process | Select-Object Id, Name, WS, Responding | foreach { # Print 'red' row if WS greater than 100 MB if([System.Math]::Round($_.WS/1MB,1) -match "^([0-9]|[0-9][0-9]|[1-9][0-9... | 488, 526, 6439 | colors, console, powershell | <h1>How to colorise PowerShell output of Format-Table</h1>
<p>I try to colorise the column RAM in red if the value is greater than 100 MB:</p>
<pre><code>Get-Process | Format-Table @{ Label = "PID"; Expression={$_.Id}},
@{ Label = "Name"; Expression={$_.Name}},
@{ Label = "RAM (MB)"; Expression... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,611 | bash | # How to colorise PowerShell output of Format-Table
I try to colorise the column RAM in red if the value is greater than 100 MB:
```
Get-Process | Format-Table @{ Label = "PID"; Expression={$_.Id}},
@{ Label = "Name"; Expression={$_.Name}},
@{ Label = "RAM (MB)"; Expression={[System.Math]::Rou... | ## You could colorize *the row* making use of a regular expression...
```
filter colorize-row{
Get-Process | Select-Object Id, Name, WS, Responding | foreach {
# Print 'red' row if WS greater than 100 MB
if([System.Math]::Round($_.WS/1MB,1) -match "^([0-9]|[0-9][0-9]|[1-9][0-9]?$|^100$)$"){
... |
7970702 | Simple search and replace without regex | 27 | 2011-11-01 18:00:19 | <p>I've got a file with various wildcards in it that I want to be able to substitute from a (Bash) shell script. I've got the following which works great until one of the variables contains characters that are special to regexes:</p>
<pre><code>VERSION="1.0"
perl -i -pe "s/VERSION/${VERSION}/g" txtf... | 9,130 | 188,414 | 2024-01-11 11:56:17 | 7,970,786 | 12 | 2011-11-01 18:07:48 | 473,798 | 2021-04-29 13:29:00 | https://stackoverflow.com/q/7970702 | https://stackoverflow.com/a/7970786 | <p>Use the following:</p>
<pre><code>perl -i -pe "s|APP_NAME|\\Q${APP_NAME}|g" txtfile.txt
</code></pre>
<p>Since a vertical bar is not a legal character as part of a path, you are good to go.</p>
| <p>Use the following:</p> <pre><code>perl -i -pe "s|APP_NAME|\\Q${APP_NAME}|g" txtfile.txt </code></pre> <p>Since a vertical bar is not a legal character as part of a path, you are good to go.</p> | 387, 580, 1469 | bash, perl, text | <h1>Simple search and replace without regex</h1>
<p>I've got a file with various wildcards in it that I want to be able to substitute from a (Bash) shell script. I've got the following which works great until one of the variables contains characters that are special to regexes:</p>
<pre><code>VERSION="1.0"
pe... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,612 | bash | # Simple search and replace without regex
I've got a file with various wildcards in it that I want to be able to substitute from a (Bash) shell script. I've got the following which works great until one of the variables contains characters that are special to regexes:
```
VERSION="1.0"
perl -i -pe "s/VERSION/${VERSIO... | Use the following:
```
perl -i -pe "s|APP_NAME|\\Q${APP_NAME}|g" txtfile.txt
```
Since a vertical bar is not a legal character as part of a path, you are good to go. |
5215343 | How can I pause in zsh? | 25 | 2011-03-07 02:54:31 | <p>I want to write this bash loop for zsh</p>
<pre><code>while true; do echo "print something"; read -p "pause"; done
</code></pre>
<p>This loop echos, then waits for the user to press enter. If I enter it as is, the read statement doesn't pause, causing zsh to infinitely echo "print something" without waiting for t... | 16,051 | 594,496 | 2023-06-13 15:03:19 | 5,215,407 | 12 | 2011-03-07 03:06:27 | 319,906 | 2011-03-07 03:17:36 | https://stackoverflow.com/q/5215343 | https://stackoverflow.com/a/5215407 | <p>It looks like <code>-p</code> does something different in <code>zsh</code>. You will probably need something like <code>read some_variable\?pause</code>.</p>
| <p>It looks like <code>-p</code> does something different in <code>zsh</code>. You will probably need something like <code>read some_variable\?pause</code>.</p> | 387, 3791 | bash, zsh | <h1>How can I pause in zsh?</h1>
<p>I want to write this bash loop for zsh</p>
<pre><code>while true; do echo "print something"; read -p "pause"; done
</code></pre>
<p>This loop echos, then waits for the user to press enter. If I enter it as is, the read statement doesn't pause, causing zsh to infinitely echo "print... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,613 | bash | # How can I pause in zsh?
I want to write this bash loop for zsh
```
while true; do echo "print something"; read -p "pause"; done
```
This loop echos, then waits for the user to press enter. If I enter it as is, the read statement doesn't pause, causing zsh to infinitely echo "print something" without waiting for th... | It looks like `-p` does something different in `zsh`. You will probably need something like `read some_variable\?pause`. |
26379379 | How to create a symbolic link when target directory doesn't exist? | 24 | 2014-10-15 09:47:21 | <p>Is there a flag you can add to the <code>ln</code> command to force the creation of the target directory structure (like <code>mkdir -p</code>).</p>
<p>Consider :</p>
<pre><code>ln -s /Applications/'Sublime Text.app'/Contents/SharedSupport/bin/subl /usr/local/bin/
</code></pre>
<p>Which adds a symlink to the Subl... | 29,661 | 1,772,521 | 2021-01-19 14:07:54 | 26,380,036 | 12 | 2014-10-15 10:17:03 | 1,490,552 | 2014-10-16 11:17:02 | https://stackoverflow.com/q/26379379 | https://stackoverflow.com/a/26380036 | <p>Try like this,</p>
<pre><code>mkdir -p /create_your_path/ && xargs ln -s /link_file_path/file /create_your_path/
</code></pre>
| <p>Try like this,</p> <pre><code>mkdir -p /create_your_path/ && xargs ln -s /link_file_path/file /create_your_path/ </code></pre> | 34, 387, 391 | bash, terminal, unix | <h1>How to create a symbolic link when target directory doesn't exist?</h1>
<p>Is there a flag you can add to the <code>ln</code> command to force the creation of the target directory structure (like <code>mkdir -p</code>).</p>
<p>Consider :</p>
<pre><code>ln -s /Applications/'Sublime Text.app'/Contents/SharedSupport... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,614 | bash | # How to create a symbolic link when target directory doesn't exist?
Is there a flag you can add to the `ln` command to force the creation of the target directory structure (like `mkdir -p`).
Consider :
```
ln -s /Applications/'Sublime Text.app'/Contents/SharedSupport/bin/subl /usr/local/bin/
```
Which adds a symli... | Try like this,
```
mkdir -p /create_your_path/ && xargs ln -s /link_file_path/file /create_your_path/
``` |
23552704 | how to recreate a working CURL command with Invoke-WebRequest in Powershell | 24 | 2014-05-08 21:16:24 | <p>This curl command works as desired:</p>
<pre><code>curl -H "X-Api-Key:j65k423lj4k2l3fds" `
-X PUT `
-d "alerts_enabled=true" `
https://some/working/file.xml
</code></pre>
<p>How can I recreate this natively in PS with <code>Invoke-WebRequest</code>? I've tried</p>
<pre><code>Invoke-WebRequest -H... | 91,886 | 3,561,945 | 2024-06-12 18:50:54 | 23,614,844 | 12 | 2014-05-12 17:02:35 | 3,561,945 | 2014-05-12 17:02:35 | https://stackoverflow.com/q/23552704 | https://stackoverflow.com/a/23614844 | <p>got it to work natively using invoke-webrequest. powershell guru here at work helped me out. Switched to the New Relic API version 2 (available at <a href="https://rpm.newrelic.com/api/explore" rel="noreferrer">https://rpm.newrelic.com/api/explore</a>), which uses JSON instead of xml, and made some sytax tweaks.</p>... | <p>got it to work natively using invoke-webrequest. powershell guru here at work helped me out. Switched to the New Relic API version 2 (available at <a href="https://rpm.newrelic.com/api/explore" rel="noreferrer">https://rpm.newrelic.com/api/explore</a>), which uses JSON instead of xml, and made some sytax tweaks.</p>... | 526, 1554 | curl, powershell | <h1>how to recreate a working CURL command with Invoke-WebRequest in Powershell</h1>
<p>This curl command works as desired:</p>
<pre><code>curl -H "X-Api-Key:j65k423lj4k2l3fds" `
-X PUT `
-d "alerts_enabled=true" `
https://some/working/file.xml
</code></pre>
<p>How can I recreate this natively in PS... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,615 | bash | # how to recreate a working CURL command with Invoke-WebRequest in Powershell
This curl command works as desired:
```
curl -H "X-Api-Key:j65k423lj4k2l3fds" `
-X PUT `
-d "alerts_enabled=true" `
https://some/working/file.xml
```
How can I recreate this natively in PS with `Invoke-WebRequest`? I've t... | got it to work natively using invoke-webrequest. powershell guru here at work helped me out. Switched to the New Relic API version 2 (available at <https://rpm.newrelic.com/api/explore>), which uses JSON instead of xml, and made some sytax tweaks.
```
$json = @"{"alert_policy":[{"enabled":"true"}]"@
$headers = @{}
$h... |
15610794 | Bash coding conventions | 24 | 2013-03-25 08:49:43 | <p>I am trying to learn some Bash to maybe get a job working with computers one day.</p>
<p>To improve my clarity and disciple writing my self-learning code, I am trying to adhere to a set of consistent "guiding principles".</p>
<p>As I roll my own "guidelines" I obviously ask myself: should I not be using an establi... | 17,686 | 916,332 | 2022-05-17 04:10:18 | 15,629,021 | 12 | 2013-03-26 03:43:01 | 418,413 | 2013-05-10 15:21:12 | https://stackoverflow.com/q/15610794 | https://stackoverflow.com/a/15629021 | <h1>My shell scripting standards</h1>
<ol>
<li>Prefer portability, but don't sacrifice security and whitespace awareness to it.</li>
<li>Prefer builtins over external commands.</li>
<li>But, use fast external commands to process very large inputs.</li>
<li>Avoid unnecessary subshells and pipelines.</li>
<li>Don't preo... | <h1>My shell scripting standards</h1> <ol> <li>Prefer portability, but don't sacrifice security and whitespace awareness to it.</li> <li>Prefer builtins over external commands.</li> <li>But, use fast external commands to process very large inputs.</li> <li>Avoid unnecessary subshells and pipelines.</li> <li>Don't preo... | 387 | bash | <h1>Bash coding conventions</h1>
<p>I am trying to learn some Bash to maybe get a job working with computers one day.</p>
<p>To improve my clarity and disciple writing my self-learning code, I am trying to adhere to a set of consistent "guiding principles".</p>
<p>As I roll my own "guidelines" I obviously ask myself:... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,616 | bash | # Bash coding conventions
I am trying to learn some Bash to maybe get a job working with computers one day.
To improve my clarity and disciple writing my self-learning code, I am trying to adhere to a set of consistent "guiding principles".
As I roll my own "guidelines" I obviously ask myself: should I not be using ... | # My shell scripting standards
1. Prefer portability, but don't sacrifice security and whitespace awareness to it.
2. Prefer builtins over external commands.
3. But, use fast external commands to process very large inputs.
4. Avoid unnecessary subshells and pipelines.
5. Don't preoptimize.
6. Learn the rules of quotin... |
22865507 | Using grep and awk together | 23 | 2014-04-04 14:24:51 | <p>I have a file (A.txt) with 4 columns of numbers and another file with 3 columns of numbers (B.txt). I need to solve the following problems:</p>
<ol>
<li><p>Find all lines in A.txt whose 3rd column has a number that appears any where in the 3rd column of B.txt.</p>
</li>
<li><p>Assume that I have many files like A.tx... | 144,121 | 363,902 | 2024-02-19 16:11:47 | 22,865,811 | 12 | 2014-04-04 14:39:53 | 1,534,218 | 2014-04-04 17:04:51 | https://stackoverflow.com/q/22865507 | https://stackoverflow.com/a/22865811 | <p>Here is an example. Create the following files and run</p>
<pre><code>awk -f c.awk B.txt A*.txt
</code></pre>
<p><strong>c.awk</strong></p>
<pre><code>FNR==NR {
s[$3]
next
}
$3 in s {
print FILENAME, $0
}
</code></pre>
<p><strong>A1.txt</strong></p>
<pre><code>1 2 3
1 2 6
1 2 5
</code></pre>
<p><... | <p>Here is an example. Create the following files and run</p> <pre><code>awk -f c.awk B.txt A*.txt </code></pre> <p><strong>c.awk</strong></p> <pre><code>FNR==NR { s[$3] next } $3 in s { print FILENAME, $0 } </code></pre> <p><strong>A1.txt</strong></p> <pre><code>1 2 3 1 2 6 1 2 5 </code></pre> <p><... | 387, 990, 1271 | awk, bash, grep | <h1>Using grep and awk together</h1>
<p>I have a file (A.txt) with 4 columns of numbers and another file with 3 columns of numbers (B.txt). I need to solve the following problems:</p>
<ol>
<li><p>Find all lines in A.txt whose 3rd column has a number that appears any where in the 3rd column of B.txt.</p>
</li>
<li><p>As... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,617 | bash | # Using grep and awk together
I have a file (A.txt) with 4 columns of numbers and another file with 3 columns of numbers (B.txt). I need to solve the following problems:
1. Find all lines in A.txt whose 3rd column has a number that appears any where in the 3rd column of B.txt.
2. Assume that I have many files like A.... | Here is an example. Create the following files and run
```
awk -f c.awk B.txt A*.txt
```
**c.awk**
```
FNR==NR {
s[$3]
next
}
$3 in s {
print FILENAME, $0
}
```
**A1.txt**
```
1 2 3
1 2 6
1 2 5
```
**A2.txt**
```
1 2 3
1 2 6
1 2 5
```
**B.txt**
```
1 2 3
1 2 5
2 1 8
```
The output should be:
```... |
16937104 | Provide password to ssh command inside bash script, Without the usage of public keys and Expect | 23 | 2013-06-05 10:06:34 | <p>I want to use <code>SSH</code> inside a script, but this script is not going to be executed on my machine.</p>
<p>In my implementation there are two limitations. </p>
<ul>
<li>I can not work outside shell's standards,therefore i can not use <code>expect</code> because i do not know if it will be available on this ... | 125,740 | 2,357,195 | 2024-10-23 17:29:38 | 16,937,638 | 12 | 2013-06-05 10:33:31 | 34,148 | 2013-06-05 10:42:25 | https://stackoverflow.com/q/16937104 | https://stackoverflow.com/a/16937638 | <p>First of all: <strong>Don't put secrets in clear text</strong> <em>unless</em> you know why it is a safe thing to do (i.e. you have assessed what damage can be done by an attacker knowing the secret).</p>
<p>If you are ok with putting secrets in your script, you could ship an ssh key with it and execute in an <code... | <p>First of all: <strong>Don't put secrets in clear text</strong> <em>unless</em> you know why it is a safe thing to do (i.e. you have assessed what damage can be done by an attacker knowing the secret).</p> <p>If you are ok with putting secrets in your script, you could ship an ssh key with it and execute in an <code... | 58, 386, 387, 390 | bash, linux, shell, ssh | <h1>Provide password to ssh command inside bash script, Without the usage of public keys and Expect</h1>
<p>I want to use <code>SSH</code> inside a script, but this script is not going to be executed on my machine.</p>
<p>In my implementation there are two limitations. </p>
<ul>
<li>I can not work outside shell's sta... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,618 | bash | # Provide password to ssh command inside bash script, Without the usage of public keys and Expect
I want to use `SSH` inside a script, but this script is not going to be executed on my machine.
In my implementation there are two limitations.
- I can not work outside shell's standards,therefore i can not use `expect`... | First of all: **Don't put secrets in clear text** *unless* you know why it is a safe thing to do (i.e. you have assessed what damage can be done by an attacker knowing the secret).
If you are ok with putting secrets in your script, you could ship an ssh key with it and execute in an `ssh-agent` shell:
```
#!/usr/bin/... |
10297002 | Passing empty arguments to executables using powershell | 23 | 2012-04-24 11:31:39 | <p>Powershell seems to drop empty string arguments when passed to a command. I have this code</p>
<pre><code>PS D:\> $b.name = "foo bar"
PS D:\> ./echoargs $b.name
Arg 0 is D:\echoargs.exe
Arg 1 is foo bar
PS D:\> $b.name = ""
PS D:\> ./echoargs $b.name
Arg 0 is D:\echoargs.exe
</code></pre>
<p>You can as... | 18,639 | 1,353,535 | 2024-01-30 16:47:43 | 10,301,470 | 12 | 2012-04-24 15:51:15 | 153,982 | 2012-04-24 15:51:15 | https://stackoverflow.com/q/10297002 | https://stackoverflow.com/a/10301470 | <p>If you want an empty string to appear try escaped quotes around the argument like so:</p>
<pre><code>PS> $b = [psobject]@{name = ''}
PS> echoargs `"$($b.Name)`"
Arg 0 is <>
Command line:
"C:\Users\Keith\Pscx\Trunk\Src\Pscx\bin\Release\Apps\EchoArgs.exe" ""
</code></pre>
<p>Note that I tested this on ... | <p>If you want an empty string to appear try escaped quotes around the argument like so:</p> <pre><code>PS> $b = [psobject]@{name = ''} PS> echoargs `"$($b.Name)`" Arg 0 is <> Command line: "C:\Users\Keith\Pscx\Trunk\Src\Pscx\bin\Release\Apps\EchoArgs.exe" "" </code></pre> <p>Note that I tested this on ... | 526, 1231 | command-line, powershell | <h1>Passing empty arguments to executables using powershell</h1>
<p>Powershell seems to drop empty string arguments when passed to a command. I have this code</p>
<pre><code>PS D:\> $b.name = "foo bar"
PS D:\> ./echoargs $b.name
Arg 0 is D:\echoargs.exe
Arg 1 is foo bar
PS D:\> $b.name = ""
PS D:\> ./echoa... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,619 | bash | # Passing empty arguments to executables using powershell
Powershell seems to drop empty string arguments when passed to a command. I have this code
```
PS D:\> $b.name = "foo bar"
PS D:\> ./echoargs $b.name
Arg 0 is D:\echoargs.exe
Arg 1 is foo bar
PS D:\> $b.name = ""
PS D:\> ./echoargs $b.name
Arg 0 is D:\echoargs... | If you want an empty string to appear try escaped quotes around the argument like so:
```
PS> $b = [psobject]@{name = ''}
PS> echoargs `"$($b.Name)`"
Arg 0 is <>
Command line:
"C:\Users\Keith\Pscx\Trunk\Src\Pscx\bin\Release\Apps\EchoArgs.exe" ""
```
Note that I tested this on V3 so I'm not sure if the behavior will... |
2499270 | How to print ASCII value of a character using basic awk only | 23 | 2010-03-23 10:59:46 | <p>I need to print the ASCII value of the given character in awk only.</p>
<p>Below code gives <code>0</code> as output:</p>
<pre><code>echo a | awk '{ printf("%d \n",$1); }'
</code></pre>
| 35,598 | 229,608 | 2022-10-09 10:30:09 | 2,499,383 | 12 | 2010-03-23 11:21:42 | 131,527 | 2014-05-05 14:35:26 | https://stackoverflow.com/q/2499270 | https://stackoverflow.com/a/2499383 | <p>see the awk manual for <a href="http://www.gnu.org/software/gawk/manual/html_node/Ordinal-Functions.html" rel="noreferrer">ordinal functions</a> you can use. But since you are using awk, you should be on some version of shell, eg bash. so why not use the shell?</p>
<pre><code>$ printf "%d" "'a"
97
</code></pre>
| <p>see the awk manual for <a href="http://www.gnu.org/software/gawk/manual/html_node/Ordinal-Functions.html" rel="noreferrer">ordinal functions</a> you can use. But since you are using awk, you should be on some version of shell, eg bash. so why not use the shell?</p> <pre><code>$ printf "%d" "'a" 97 </code></pre> | 34, 390, 990 | awk, shell, unix | <h1>How to print ASCII value of a character using basic awk only</h1>
<p>I need to print the ASCII value of the given character in awk only.</p>
<p>Below code gives <code>0</code> as output:</p>
<pre><code>echo a | awk '{ printf("%d \n",$1); }'
</code></pre>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,620 | bash | # How to print ASCII value of a character using basic awk only
I need to print the ASCII value of the given character in awk only.
Below code gives `0` as output:
```
echo a | awk '{ printf("%d \n",$1); }'
``` | see the awk manual for [ordinal functions](http://www.gnu.org/software/gawk/manual/html_node/Ordinal-Functions.html) you can use. But since you are using awk, you should be on some version of shell, eg bash. so why not use the shell?
```
$ printf "%d" "'a"
97
``` |
1924217 | PowerShell: Load WebAdministration in ps1 script on both IIS 7 and IIS 7.5 | 23 | 2009-12-17 20:03:37 | <p>I have a PowerShell script that configures web site and web application settings in IIS. So I use the cmdlets in the WebAdministration snap in. But this script needs to run on Windows 2008, Windows 7 and Windows 2008 R2. And I need it to run with minimal fuss from the user.</p>
<p>The problem is that Windows 7 an... | 30,399 | 31,037 | 2012-11-27 06:31:05 | 1,924,307 | 12 | 2009-12-17 20:20:27 | 223,370 | 2009-12-17 20:20:27 | https://stackoverflow.com/q/1924217 | https://stackoverflow.com/a/1924307 | <p>Is it possible to catch the error from one or the other, and do the opposite. Dont have my shell handy but something like:</p>
<pre><code>$succeeded = import-module WebAdministration
if (($succeeded -ne $null) -and ($succeeded.GetType() -eq [System.Exception]) {
#Could not import, trying to snapin
add-pssnapin ... | <p>Is it possible to catch the error from one or the other, and do the opposite. Dont have my shell handy but something like:</p> <pre><code>$succeeded = import-module WebAdministration if (($succeeded -ne $null) -and ($succeeded.GetType() -eq [System.Exception]) { #Could not import, trying to snapin add-pssnapin ... | 215, 526 | iis, powershell | <h1>PowerShell: Load WebAdministration in ps1 script on both IIS 7 and IIS 7.5</h1>
<p>I have a PowerShell script that configures web site and web application settings in IIS. So I use the cmdlets in the WebAdministration snap in. But this script needs to run on Windows 2008, Windows 7 and Windows 2008 R2. And I need... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,621 | bash | # PowerShell: Load WebAdministration in ps1 script on both IIS 7 and IIS 7.5
I have a PowerShell script that configures web site and web application settings in IIS. So I use the cmdlets in the WebAdministration snap in. But this script needs to run on Windows 2008, Windows 7 and Windows 2008 R2. And I need it to run ... | Is it possible to catch the error from one or the other, and do the opposite. Dont have my shell handy but something like:
```
$succeeded = import-module WebAdministration
if (($succeeded -ne $null) -and ($succeeded.GetType() -eq [System.Exception]) {
#Could not import, trying to snapin
add-pssnapin WebAdministrat... |
630382 | How to access the 64-bit registry from a 32-bit Powershell instance? | 23 | 2009-03-10 14:11:09 | <p>If you launch a 32-bit instance of Powershell (%SystemRoot%\syswow64\WindowsPowerShell\v1.0\powershell.exe), then the registry provider only sees the limited 32-bit parts of the registry.</p>
<pre><code>**32-bit console**
PS> (dir HKLM:\SOFTWARE | measure).count - (dir HKLM:\SOFTWARE\wow6432node | measure).count... | 32,819 | 74,439 | 2021-07-29 11:56:33 | 630,796 | 12 | 2009-03-10 15:30:40 | 23,843 | 2009-03-10 15:30:40 | https://stackoverflow.com/q/630382 | https://stackoverflow.com/a/630796 | <p>When Powershell is running as a 32 bit process, I am not aware of a mechanism to "switch it" to 64bit mode. The whole point of virtualization support in 64bit systems is to make 32bit processes believe they are living in a 32bit OS...</p>
<p>However, that said I used the following technique in the past and it worke... | <p>When Powershell is running as a 32 bit process, I am not aware of a mechanism to "switch it" to 64bit mode. The whole point of virtualization support in 64bit systems is to make 32bit processes believe they are living in a 32bit OS...</p> <p>However, that said I used the following technique in the past and it worke... | 263, 526, 681 | 64-bit, powershell, registry | <h1>How to access the 64-bit registry from a 32-bit Powershell instance?</h1>
<p>If you launch a 32-bit instance of Powershell (%SystemRoot%\syswow64\WindowsPowerShell\v1.0\powershell.exe), then the registry provider only sees the limited 32-bit parts of the registry.</p>
<pre><code>**32-bit console**
PS> (dir HKLM... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,622 | bash | # How to access the 64-bit registry from a 32-bit Powershell instance?
If you launch a 32-bit instance of Powershell (%SystemRoot%\syswow64\WindowsPowerShell\v1.0\powershell.exe), then the registry provider only sees the limited 32-bit parts of the registry.
```
**32-bit console**
PS> (dir HKLM:\SOFTWARE | measure).c... | When Powershell is running as a 32 bit process, I am not aware of a mechanism to "switch it" to 64bit mode. The whole point of virtualization support in 64bit systems is to make 32bit processes believe they are living in a 32bit OS...
However, that said I used the following technique in the past and it worked very nic... |
36518973 | iTerm2 Shell Integration and Oh My Zsh Conflicts | 22 | 2016-04-09 15:38:09 | <p>I've recently re-installed iTerm2 and am now running into an interesting problem after setting up iTerm's Shell Integration.</p>
<p>Upon open a new terminal window, everything seems to look correct, showing the proper "agnoster" theme from Oh My ZSH:</p>
<p><a href="https://i.sstatic.net/tnvsR.png"><img src="https... | 15,084 | 446,491 | 2020-08-17 11:18:28 | 36,533,137 | 12 | 2016-04-10 17:34:22 | 3,213,062 | 2018-08-30 23:23:19 | https://stackoverflow.com/q/36518973 | https://stackoverflow.com/a/36533137 | <p>I just installed the Shell Integration in iTerm 2 (Build 2.9.20160313) and had the exact same problem.</p>
<p>The way I solved it was by adding a single line to <code>~/.iterm2_shell_integration.zsh</code> right after <code>export ITERM_SHELL_INTEGRATION_INSTALLED=Yes</code> at line 3:</p>
<p><code>ITERM2_PRECMD_... | <p>I just installed the Shell Integration in iTerm 2 (Build 2.9.20160313) and had the exact same problem.</p> <p>The way I solved it was by adding a single line to <code>~/.iterm2_shell_integration.zsh</code> right after <code>export ITERM_SHELL_INTEGRATION_INSTALLED=Yes</code> at line 3:</p> <p><code>ITERM2_PRECMD_... | 390, 89892, 93854 | iterm2, oh-my-zsh, shell | <h1>iTerm2 Shell Integration and Oh My Zsh Conflicts</h1>
<p>I've recently re-installed iTerm2 and am now running into an interesting problem after setting up iTerm's Shell Integration.</p>
<p>Upon open a new terminal window, everything seems to look correct, showing the proper "agnoster" theme from Oh My ZSH:</p>
<p... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,623 | bash | # iTerm2 Shell Integration and Oh My Zsh Conflicts
I've recently re-installed iTerm2 and am now running into an interesting problem after setting up iTerm's Shell Integration.
Upon open a new terminal window, everything seems to look correct, showing the proper "agnoster" theme from Oh My ZSH:
[ and had the exact same problem.
The way I solved it was by adding a single line to `~/.iterm2_shell_integration.zsh` right after `export ITERM_SHELL_INTEGRATION_INSTALLED=Yes` at line 3:
`ITERM2_PRECMD_PS1="$PS1"`
Thus, this is how the head of th... |
29607287 | Powershell module: Dynamic mandatory hierarchical parameters | 21 | 2015-04-13 14:03:14 | <p>So what I really want is somewhat usable tab completion in a PS module.
ValidateSet seems to be the way to go here.</p>
<p>Unfortunately my data is dynamic, so I cannot annotate the parameter with all valid values upfront.
DynamicParameters/IDynamicParameters seems to be the solution for <em>that</em> problem.</p>
... | 1,346 | 59,492 | 2015-04-18 02:57:30 | 29,680,516 | 12 | 2015-04-16 16:17:29 | 3,874,447 | 2015-04-18 02:57:30 | https://stackoverflow.com/q/29607287 | https://stackoverflow.com/a/29680516 | <p>I think this works. Unfortunately, it uses reflection to get at some of the cmdlet's private members for your first bullet. I got the idea from <a href="https://gist.github.com/fearthecowboy/1936f841d3a81710ae87" rel="noreferrer">Garrett Serack</a>. I'm not sure if I completely understood how to do the default autho... | <p>I think this works. Unfortunately, it uses reflection to get at some of the cmdlet's private members for your first bullet. I got the idea from <a href="https://gist.github.com/fearthecowboy/1936f841d3a81710ae87" rel="noreferrer">Garrett Serack</a>. I'm not sure if I completely understood how to do the default autho... | 9, 526 | c#, powershell | <h1>Powershell module: Dynamic mandatory hierarchical parameters</h1>
<p>So what I really want is somewhat usable tab completion in a PS module.
ValidateSet seems to be the way to go here.</p>
<p>Unfortunately my data is dynamic, so I cannot annotate the parameter with all valid values upfront.
DynamicParameters/IDyna... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,624 | bash | # Powershell module: Dynamic mandatory hierarchical parameters
So what I really want is somewhat usable tab completion in a PS module.
ValidateSet seems to be the way to go here.
Unfortunately my data is dynamic, so I cannot annotate the parameter with all valid values upfront.
DynamicParameters/IDynamicParameters se... | I think this works. Unfortunately, it uses reflection to get at some of the cmdlet's private members for your first bullet. I got the idea from [Garrett Serack](https://gist.github.com/fearthecowboy/1936f841d3a81710ae87). I'm not sure if I completely understood how to do the default author, so I made it so that the las... |
18532948 | How to append a newline after every match using xmlint --xpath | 20 | 2013-08-30 12:28:50 | <p>I have the following HTML code:</p>
<pre><code><textarea name="command" class="setting-input fixed-width" rows="9">1</textarea><textarea name="command" class="setting-input fixed-width" rows="5">2</textarea>
</code></pre>
<p>I would like to parse it to receive such output:</p>
<pre><co... | 13,775 | 2,345,933 | 2023-04-09 14:24:51 | 48,311,523 | 12 | 2018-01-17 23:15:26 | 785,213 | 2023-04-09 14:24:51 | https://stackoverflow.com/q/18532948 | https://stackoverflow.com/a/48311523 | <p>Hello from the year 2020!</p>
<p>As of v2.9.9 of libxml, this behavior <a href="https://gitlab.gnome.org/GNOME/libxml2/commit/da35eeae5b92b88d8ebdb64b4b327ac1c2cf1bce" rel="nofollow noreferrer">has been fixed in <code>xmllint</code> itself</a>.</p>
<pre class="lang-bash prettyprint-override"><code>echo \
'<textar... | <p>Hello from the year 2020!</p> <p>As of v2.9.9 of libxml, this behavior <a href="https://gitlab.gnome.org/GNOME/libxml2/commit/da35eeae5b92b88d8ebdb64b4b327ac1c2cf1bce" rel="nofollow noreferrer">has been fixed in <code>xmllint</code> itself</a>.</p> <pre class="lang-bash prettyprint-override"><code>echo \ '<textar... | 19, 390, 1227, 70156 | shell, xml, xmllint, xpath | <h1>How to append a newline after every match using xmlint --xpath</h1>
<p>I have the following HTML code:</p>
<pre><code><textarea name="command" class="setting-input fixed-width" rows="9">1</textarea><textarea name="command" class="setting-input fixed-width" rows="5">2</textarea>
</code><... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,625 | bash | # How to append a newline after every match using xmlint --xpath
I have the following HTML code:
```
<textarea name="command" class="setting-input fixed-width" rows="9">1</textarea><textarea name="command" class="setting-input fixed-width" rows="5">2</textarea>
```
I would like to parse it to receive such output... | Hello from the year 2020!
As of v2.9.9 of libxml, this behavior [has been fixed in `xmllint` itself](https://gitlab.gnome.org/GNOME/libxml2/commit/da35eeae5b92b88d8ebdb64b4b327ac1c2cf1bce).
```
echo \
'<textarea name="command" class="setting-input fixed-width"
rows="9">1</textarea>
<textarea name="command" class="se... |
38465751 | @reboot is not working in CRON | 20 | 2016-07-19 18:16:31 | <p>I'm trying to run a shell-script and a command at the start of my Ubuntu server. </p>
<p>Here is my <code>CRON</code></p>
<pre><code>@reboot /home/steam/check.sh
@reboot screen -d -S up -m node /var/www/html/Up1/server/server.js
</code></pre>
<p>What I'm getting in the logs:
<code>grep CRON /var/log/syslog</code... | 84,211 | 5,856,616 | 2021-11-29 13:50:18 | 38,484,205 | 12 | 2016-07-20 14:34:11 | 1,248,008 | 2016-07-20 15:57:41 | https://stackoverflow.com/q/38465751 | https://stackoverflow.com/a/38484205 | <p>Take a look at the systemd.service manpage. It describes how to configure systemd to manage a service. I am sure you will find examples for your system in <code>/usr/lib/systemd/system</code> or similar paths.</p>
<p>In your case, the service would look somewhat like this:</p>
<pre><code>[Unit]
Description=Unturne... | <p>Take a look at the systemd.service manpage. It describes how to configure systemd to manage a service. I am sure you will find examples for your system in <code>/usr/lib/systemd/system</code> or similar paths.</p> <p>In your case, the service would look somewhat like this:</p> <pre><code>[Unit] Description=Unturne... | 58, 387, 390, 549, 601 | bash, cron, linux, shell, ubuntu | <h1>@reboot is not working in CRON</h1>
<p>I'm trying to run a shell-script and a command at the start of my Ubuntu server. </p>
<p>Here is my <code>CRON</code></p>
<pre><code>@reboot /home/steam/check.sh
@reboot screen -d -S up -m node /var/www/html/Up1/server/server.js
</code></pre>
<p>What I'm getting in the log... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,626 | bash | # @reboot is not working in CRON
I'm trying to run a shell-script and a command at the start of my Ubuntu server.
Here is my `CRON`
```
@reboot /home/steam/check.sh
@reboot screen -d -S up -m node /var/www/html/Up1/server/server.js
```
What I'm getting in the logs:
`grep CRON /var/log/syslog`
```
Jul 19 19:48:28 v... | Take a look at the systemd.service manpage. It describes how to configure systemd to manage a service. I am sure you will find examples for your system in `/usr/lib/systemd/system` or similar paths.
In your case, the service would look somewhat like this:
```
[Unit]
Description=Unturned Game Server
[Install]
WantedB... |
19754784 | Running a simple shell script as a cronjob | 20 | 2013-11-03 15:49:39 | <p>I have a very simple shell script I need to run as a cronjob but I can't get even the test scripts to run. Here's and example script:</p>
<p>/home/myUser/scripts/test.sh</p>
<pre><code>#!/bin/bash
touch file.txt
</code></pre>
<p>crontab:</p>
<pre><code>* * * * * /home/myUser/scripts/test.sh
</code></pre>
<p>The... | 155,404 | 2,608,063 | 2018-08-09 21:44:08 | 19,755,335 | 12 | 2013-11-03 16:47:45 | 89,817 | 2013-11-03 20:16:48 | https://stackoverflow.com/q/19754784 | https://stackoverflow.com/a/19755335 | <p>What directory is file.txt in? cron runs jobs in your home directory, so unless your script <code>cd</code>s somewhere else, that's where it's going to look for/create file.txt.</p>
<p>EDIT: When you refer to a file without specifying its full path (e.g. <code>file.txt</code>, as opposed to the full path <code>/hom... | <p>What directory is file.txt in? cron runs jobs in your home directory, so unless your script <code>cd</code>s somewhere else, that's where it's going to look for/create file.txt.</p> <p>EDIT: When you refer to a file without specifying its full path (e.g. <code>file.txt</code>, as opposed to the full path <code>/hom... | 387, 390, 601 | bash, cron, shell | <h1>Running a simple shell script as a cronjob</h1>
<p>I have a very simple shell script I need to run as a cronjob but I can't get even the test scripts to run. Here's and example script:</p>
<p>/home/myUser/scripts/test.sh</p>
<pre><code>#!/bin/bash
touch file.txt
</code></pre>
<p>crontab:</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 | 10,627 | bash | # Running a simple shell script as a cronjob
I have a very simple shell script I need to run as a cronjob but I can't get even the test scripts to run. Here's and example script:
/home/myUser/scripts/test.sh
```
#!/bin/bash
touch file.txt
```
crontab:
```
* * * * * /home/myUser/scripts/test.sh
```
The script runs... | What directory is file.txt in? cron runs jobs in your home directory, so unless your script `cd`s somewhere else, that's where it's going to look for/create file.txt.
EDIT: When you refer to a file without specifying its full path (e.g. `file.txt`, as opposed to the full path `/home/myUser/scripts/file.txt`) in shell,... |
10641233 | How do I sudo if in Bash? | 20 | 2012-05-17 18:13:16 | <p>I need to check for a directory in the home directory of another user. Normally I would sudo but that forks another process and I also lose my environment.</p>
<p>For example, I have:</p>
<pre><code>if [[ -d "/home/otheruser/svn" ]];
then
echo "SVN exists"
else
echo "SVN does not exist"
fi
</code></pre>
<p>... | 13,816 | 681,040 | 2025-03-22 00:12:51 | 10,641,279 | 12 | 2012-05-17 18:17:05 | 193,468 | 2025-03-22 00:12:51 | https://stackoverflow.com/q/10641233 | https://stackoverflow.com/a/10641279 | <p>You need to run it under a subshell. Example:</p>
<pre><code>if sudo bash -c '[[ -d "/home/otheruser/svn" ]]'
then
echo "SVN exists"
else
echo "SVN does not exist"
fi
</code></pre>
<p>Note that if you are using <code>-d</code> specifically (or any of the other operators supported by... | <p>You need to run it under a subshell. Example:</p> <pre><code>if sudo bash -c '[[ -d "/home/otheruser/svn" ]]' then echo "SVN exists" else echo "SVN does not exist" fi </code></pre> <p>Note that if you are using <code>-d</code> specifically (or any of the other operators supported by... | 387, 390, 1674 | bash, shell, sudo | <h1>How do I sudo if in Bash?</h1>
<p>I need to check for a directory in the home directory of another user. Normally I would sudo but that forks another process and I also lose my environment.</p>
<p>For example, I have:</p>
<pre><code>if [[ -d "/home/otheruser/svn" ]];
then
echo "SVN exists"
else
echo "SVN do... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,628 | bash | # How do I sudo if in Bash?
I need to check for a directory in the home directory of another user. Normally I would sudo but that forks another process and I also lose my environment.
For example, I have:
```
if [[ -d "/home/otheruser/svn" ]];
then
echo "SVN exists"
else
echo "SVN does not exist"
fi
```
I nee... | You need to run it under a subshell. Example:
```
if sudo bash -c '[[ -d "/home/otheruser/svn" ]]'
then
echo "SVN exists"
else
echo "SVN does not exist"
fi
```
Note that if you are using `-d` specifically (or any of the other operators supported by `/bin/test`) then using `sudo test` is better and safer, as shown... |
9301531 | Using aliases with nohup | 20 | 2012-02-15 21:16:29 | <p>Why doesn't the following work? </p>
<pre><code>$ alias sayHello='/bin/echo "Hello world!"'
$ sayHello
Hello world!
$ nohup sayHello
nohup: appending output to `nohup.out'
nohup: cannot run command `sayHello': No such file or directory
</code></pre>
<p>(the reason I ask this question is because I've a... | 11,207 | 884,447 | 2020-07-08 19:45:33 | 9,301,796 | 12 | 2012-02-15 21:35:07 | 679,177 | 2020-07-08 19:45:33 | https://stackoverflow.com/q/9301531 | https://stackoverflow.com/a/9301796 | <p>Because the shell doesn't pass aliases on to child processes (except when you use $() or ``).</p>
<p>$ alias sayHello='/bin/echo "Hello world!"'</p>
<p>Now an alias is known in this shell process, which is fine but only works in this one shell process.</p>
<pre><code>$ sayHello
Hello world!
</code></pre>... | <p>Because the shell doesn't pass aliases on to child processes (except when you use $() or ``).</p> <p>$ alias sayHello='/bin/echo "Hello world!"'</p> <p>Now an alias is known in this shell process, which is fine but only works in this one shell process.</p> <pre><code>$ sayHello Hello world! </code></pre>... | 34, 387, 1448, 18966 | alias, bash, nohup, unix | <h1>Using aliases with nohup</h1>
<p>Why doesn't the following work? </p>
<pre><code>$ alias sayHello='/bin/echo "Hello world!"'
$ sayHello
Hello world!
$ nohup sayHello
nohup: appending output to `nohup.out'
nohup: cannot run command `sayHello': No such file or directory
</code></pre>
<p>(the reason I a... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,629 | bash | # Using aliases with nohup
Why doesn't the following work?
```
$ alias sayHello='/bin/echo "Hello world!"'
$ sayHello
Hello world!
$ nohup sayHello
nohup: appending output to `nohup.out'
nohup: cannot run command `sayHello': No such file or directory
```
(the reason I ask this question is because I've a... | Because the shell doesn't pass aliases on to child processes (except when you use $() or ``).
$ alias sayHello='/bin/echo "Hello world!"'
Now an alias is known in this shell process, which is fine but only works in this one shell process.
```
$ sayHello
Hello world!
```
Since you said "sayHello" in the same shell... |
3569784 | Using sed to get an env var from /proc/*/environ weirdness with \x00 | 20 | 2010-08-25 20:03:58 | <p>I'm trying to grovel through some other processes environment to get a specific env var.</p>
<p>So I've been trying a sed command like:</p>
<p><code>sed -n "s/\x00ENV_VAR_NAME=\([^\x00]*\)\x00/\1/p" /proc/pid/environ</code></p>
<p>But I'm getting as output the full environ file. If I replace the \1 with just a s... | 12,914 | 131,795 | 2017-10-27 16:53:21 | 3,569,935 | 12 | 2010-08-25 20:26:45 | 68,587 | 2017-09-08 09:55:59 | https://stackoverflow.com/q/3569784 | https://stackoverflow.com/a/3569935 | <p>You could process the list with gawk, setting the record separator to <code>\0</code> and the field separator to <code>=</code>:</p>
<pre><code>gawk -v 'RS=\0' -F= '$1=="ENV_VAR_NAME" {print $2}' /proc/pid/environ
</code></pre>
<p>Or you could use <code>read</code> in a loop to read each NUL-delimited line. For in... | <p>You could process the list with gawk, setting the record separator to <code>\0</code> and the field separator to <code>=</code>:</p> <pre><code>gawk -v 'RS=\0' -F= '$1=="ENV_VAR_NAME" {print $2}' /proc/pid/environ </code></pre> <p>Or you could use <code>read</code> in a loop to read each NUL-delimited line. For in... | 58, 387, 5282, 9013 | bash, environment-variables, linux, sed | <h1>Using sed to get an env var from /proc/*/environ weirdness with \x00</h1>
<p>I'm trying to grovel through some other processes environment to get a specific env var.</p>
<p>So I've been trying a sed command like:</p>
<p><code>sed -n "s/\x00ENV_VAR_NAME=\([^\x00]*\)\x00/\1/p" /proc/pid/environ</code></p>
<p>But I... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,630 | bash | # Using sed to get an env var from /proc/*/environ weirdness with \x00
I'm trying to grovel through some other processes environment to get a specific env var.
So I've been trying a sed command like:
`sed -n "s/\x00ENV_VAR_NAME=\([^\x00]*\)\x00/\1/p" /proc/pid/environ`
But I'm getting as output the full environ fil... | You could process the list with gawk, setting the record separator to `\0` and the field separator to `=`:
```
gawk -v 'RS=\0' -F= '$1=="ENV_VAR_NAME" {print $2}' /proc/pid/environ
```
Or you could use `read` in a loop to read each NUL-delimited line. For instance:
```
while read -d $'\0' ENV; do declare "$ENV"; don... |
66382994 | How to start fzf from a different directory than the current working directory? | 19 | 2021-02-26 09:10:56 | <p>I often use <code>fzf</code> to navigate the filesystem, especially the Alt-c key binding.</p>
<p>When invoked, <code>fzf</code> generates a list from the current working directory.</p>
<p>Is it possible to make <code>fzf</code> generate a list from a specified directory?</p>
<p>I have tried <code>fzf <dir></c... | 21,378 | 1,020,139 | 2025-11-09 13:29:30 | 67,056,592 | 12 | 2021-04-12 10:12:37 | 128,384 | 2021-04-13 09:16:51 | https://stackoverflow.com/q/66382994 | https://stackoverflow.com/a/67056592 | <p>Assuming you're using bash or similar, this is built into the default completion options which get installed with fzf: <a href="https://github.com/junegunn/fzf#fuzzy-completion-for-bash-and-zsh" rel="noreferrer">https://github.com/junegunn/fzf#fuzzy-completion-for-bash-and-zsh</a></p>
<p>tldr; enter start file or di... | <p>Assuming you're using bash or similar, this is built into the default completion options which get installed with fzf: <a href="https://github.com/junegunn/fzf#fuzzy-completion-for-bash-and-zsh" rel="noreferrer">https://github.com/junegunn/fzf#fuzzy-completion-for-bash-and-zsh</a></p> <p>tldr; enter start file or di... | 99, 218, 387, 113660, 134665 | bash, directory, filesystems, fzf, vim-fzf | <h1>How to start fzf from a different directory than the current working directory?</h1>
<p>I often use <code>fzf</code> to navigate the filesystem, especially the Alt-c key binding.</p>
<p>When invoked, <code>fzf</code> generates a list from the current working directory.</p>
<p>Is it possible to make <code>fzf</code>... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,631 | bash | # How to start fzf from a different directory than the current working directory?
I often use `fzf` to navigate the filesystem, especially the Alt-c key binding.
When invoked, `fzf` generates a list from the current working directory.
Is it possible to make `fzf` generate a list from a specified directory?
I have t... | Assuming you're using bash or similar, this is built into the default completion options which get installed with fzf: <https://github.com/junegunn/fzf#fuzzy-completion-for-bash-and-zsh>
tldr; enter start file or directory, append `**` and hit `Tab`. So if you'd enter `cd /foo/**` then tab opens fzf with /foo as start... |
33721892 | Is Get-ChildItem -Recurse broken when there are square brackets in the input path? | 19 | 2015-11-15 16:16:55 | <p>OK, so I feel like this <em>must</em> be a bug in PowerShell, but I wanted to see if you guys think this sounds broken. It's quite an easy thing to reproduce, but I can see why it might not be a particularly common use case. The steps I've put below aren't actually what my script was doing, I was actually calculatin... | 4,374 | 5,564,627 | 2019-03-26 23:45:46 | 55,367,757 | 12 | 2019-03-26 23:45:46 | 5,771,128 | 2019-03-26 23:45:46 | https://stackoverflow.com/q/33721892 | https://stackoverflow.com/a/55367757 | <p>TL;DR: Use <code>-LiteralPath</code> for the folder when there might be unusual characters (inc. square brackets) in the names.</p>
<hr>
<p>I wasn't able to reproduce this as per the OP in PowerShell v5.1.17134.590.</p>
<p>However, I was able to reproduce something similar, using the following command to attempt ... | <p>TL;DR: Use <code>-LiteralPath</code> for the folder when there might be unusual characters (inc. square brackets) in the names.</p> <hr> <p>I wasn't able to reproduce this as per the OP in PowerShell v5.1.17134.590.</p> <p>However, I was able to reproduce something similar, using the following command to attempt ... | 526, 29006 | get-childitem, powershell | <h1>Is Get-ChildItem -Recurse broken when there are square brackets in the input path?</h1>
<p>OK, so I feel like this <em>must</em> be a bug in PowerShell, but I wanted to see if you guys think this sounds broken. It's quite an easy thing to reproduce, but I can see why it might not be a particularly common use case. ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,632 | bash | # Is Get-ChildItem -Recurse broken when there are square brackets in the input path?
OK, so I feel like this *must* be a bug in PowerShell, but I wanted to see if you guys think this sounds broken. It's quite an easy thing to reproduce, but I can see why it might not be a particularly common use case. The steps I've p... | TL;DR: Use `-LiteralPath` for the folder when there might be unusual characters (inc. square brackets) in the names.
---
I wasn't able to reproduce this as per the OP in PowerShell v5.1.17134.590.
However, I was able to reproduce something similar, using the following command to attempt to list files in a folder I s... |
43736021 | Get exit code of process substitution with pipe into while loop | 19 | 2017-05-02 10:48:26 | <p>The following script calls another program reading its output in a while loop (see <a href="https://stackoverflow.com/questions/19570413/bash-how-to-pipe-input-to-while-loop-and-preserve-variables-after-loop-ends">Bash - How to pipe input to while loop and preserve variables after loop ends</a>):</p>
<pre><code>whi... | 3,660 | null | 2019-04-15 06:30:00 | 43,901,140 | 12 | 2017-05-10 19:24:21 | 45,375 | 2017-05-10 19:24:21 | https://stackoverflow.com/q/43736021 | https://stackoverflow.com/a/43901140 | <p><sup>Note: <code>ls -d / /nosuch</code> is used as an example command below, because it fails (exit code <code>1</code>) while still producing stdout output (<code>/</code>) (in addition to stderr output).</sup></p>
<h3>Bash v4.2+ solution:</h3>
<p><a href="https://stackoverflow.com/a/43737188/45375">ccarton's hel... | <p><sup>Note: <code>ls -d / /nosuch</code> is used as an example command below, because it fails (exit code <code>1</code>) while still producing stdout output (<code>/</code>) (in addition to stderr output).</sup></p> <h3>Bash v4.2+ solution:</h3> <p><a href="https://stackoverflow.com/a/43737188/45375">ccarton's hel... | 387, 63638 | bash, process-substitution | <h1>Get exit code of process substitution with pipe into while loop</h1>
<p>The following script calls another program reading its output in a while loop (see <a href="https://stackoverflow.com/questions/19570413/bash-how-to-pipe-input-to-while-loop-and-preserve-variables-after-loop-ends">Bash - How to pipe input to wh... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,633 | bash | # Get exit code of process substitution with pipe into while loop
The following script calls another program reading its output in a while loop (see [Bash - How to pipe input to while loop and preserve variables after loop ends](https://stackoverflow.com/questions/19570413/bash-how-to-pipe-input-to-while-loop-and-pres... | Note: `ls -d / /nosuch` is used as an example command below, because it fails (exit code `1`) while still producing stdout output (`/`) (in addition to stderr output).
### Bash v4.2+ solution:
[ccarton's helpful answer](https://stackoverflow.com/a/43737188/45375) works well in principle, but by default the `while` lo... |
42998669 | unzip file using 7z in powershell | 19 | 2017-03-24 11:44:28 | <p>What is the command to unzip a file using 7z in powershell?</p>
<pre><code>set-alias sz "$env:ProgramFiles\7-Zip\7z.exe"
sz x $zipfilePath $destinationUnzipPath -aoa -r;
</code></pre>
<p>The command works fine but it says <strong>no files to process, everything is Ok</strong> rather than unzipping the file?</p>
| 64,463 | 6,000,623 | 2025-04-02 04:13:18 | 43,044,267 | 12 | 2017-03-27 10:45:57 | 6,000,623 | 2017-03-27 10:45:57 | https://stackoverflow.com/q/42998669 | https://stackoverflow.com/a/43044267 | <p>This finally worked for me <code>sz x -o$destinationUnzipPath $zipfilePath -r ;</code></p>
| <p>This finally worked for me <code>sz x -o$destinationUnzipPath $zipfilePath -r ;</code></p> | 526, 5680 | 7zip, powershell | <h1>unzip file using 7z in powershell</h1>
<p>What is the command to unzip a file using 7z in powershell?</p>
<pre><code>set-alias sz "$env:ProgramFiles\7-Zip\7z.exe"
sz x $zipfilePath $destinationUnzipPath -aoa -r;
</code></pre>
<p>The command works fine but it says <strong>no files to process, everything is Ok</st... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,634 | bash | # unzip file using 7z in powershell
What is the command to unzip a file using 7z in powershell?
```
set-alias sz "$env:ProgramFiles\7-Zip\7z.exe"
sz x $zipfilePath $destinationUnzipPath -aoa -r;
```
The command works fine but it says **no files to process, everything is Ok** rather than unzipping the file? | This finally worked for me `sz x -o$destinationUnzipPath $zipfilePath -r ;` |
42058539 | What does the ${-#*i} mean in shell script? | 19 | 2017-02-05 23:28:44 | <p>There is a for loop in the file <code>/etc/profile</code> on CentOS 6:</p>
<pre><code>for i in /etc/profile.d/*.sh ; do
if [ -r "$i" ]; then
if [ "${-#*i}" != "$-" ]; then
. "$i"
else
. "$i" >/dev/null 2>&1
fi
fi
done
</code></pre>
<p>What does the ... | 7,571 | 4,857,099 | 2017-03-01 15:24:20 | 42,058,674 | 12 | 2017-02-05 23:51:20 | 3,476,320 | 2017-02-05 23:51:20 | https://stackoverflow.com/q/42058539 | https://stackoverflow.com/a/42058674 | <p><code>$-</code> means shell flags.</p>
<p><code>${-#*i}</code> means shell flags minus first match of <code>*i</code>.</p>
<p>If these two are not equal, then the shell is considered interactive (flag <code>i</code> is present).</p>
| <p><code>$-</code> means shell flags.</p> <p><code>${-#*i}</code> means shell flags minus first match of <code>*i</code>.</p> <p>If these two are not equal, then the shell is considered interactive (flag <code>i</code> is present).</p> | 58, 390, 90291 | centos6, linux, shell | <h1>What does the ${-#*i} mean in shell script?</h1>
<p>There is a for loop in the file <code>/etc/profile</code> on CentOS 6:</p>
<pre><code>for i in /etc/profile.d/*.sh ; do
if [ -r "$i" ]; then
if [ "${-#*i}" != "$-" ]; then
. "$i"
else
. "$i" >/dev/null 2>&1
... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,635 | bash | # What does the ${-#*i} mean in shell script?
There is a for loop in the file `/etc/profile` on CentOS 6:
```
for i in /etc/profile.d/*.sh ; do
if [ -r "$i" ]; then
if [ "${-#*i}" != "$-" ]; then
. "$i"
else
. "$i" >/dev/null 2>&1
fi
fi
done
```
What does the `... | `$-` means shell flags.
`${-#*i}` means shell flags minus first match of `*i`.
If these two are not equal, then the shell is considered interactive (flag `i` is present). |
39619956 | Short way to run command if variable is set | 19 | 2016-09-21 14:53:58 | <p>This is a hack I just discovered:</p>
<pre><code>DEBUG=true
$DEBUG && echo "Hello"
</code></pre>
<p>And this just happens to work because <code>true</code> is an actual command which returns 0, and the <code>&&</code> operator is happy with that:</p>
<pre><code>» true
» echo $?
0
</code></pre>
<p... | 16,589 | 647,991 | 2022-02-01 13:16:44 | 39,621,401 | 12 | 2016-09-21 16:01:01 | 1,126,841 | 2016-09-21 16:01:01 | https://stackoverflow.com/q/39619956 | https://stackoverflow.com/a/39621401 | <p>Instead of relying on the value of the variable to have an executable value (and a value that you <em>want</em> to be executed), define a function that simply checks if the value is set.</p>
<pre><code>debug () [[ -v DEBUG ]]
debug && echo "Hello"
</code></pre>
<p>If <code>DEBUG</code> is set <em>at all</... | <p>Instead of relying on the value of the variable to have an executable value (and a value that you <em>want</em> to be executed), define a function that simply checks if the value is set.</p> <pre><code>debug () [[ -v DEBUG ]] debug && echo "Hello" </code></pre> <p>If <code>DEBUG</code> is set <em>at all</... | 387 | bash | <h1>Short way to run command if variable is set</h1>
<p>This is a hack I just discovered:</p>
<pre><code>DEBUG=true
$DEBUG && echo "Hello"
</code></pre>
<p>And this just happens to work because <code>true</code> is an actual command which returns 0, and the <code>&&</code> operator is happy with that:... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,636 | bash | # Short way to run command if variable is set
This is a hack I just discovered:
```
DEBUG=true
$DEBUG && echo "Hello"
```
And this just happens to work because `true` is an actual command which returns 0, and the `&&` operator is happy with that:
```
» true
» echo $?
0
```
Is there a non-hackish way of execute a p... | Instead of relying on the value of the variable to have an executable value (and a value that you *want* to be executed), define a function that simply checks if the value is set.
```
debug () [[ -v DEBUG ]]
debug && echo "Hello"
```
If `DEBUG` is set *at all*, even to the empty string, `debug` will succeed and the ... |
26109816 | Laravel, dump-autoload without Shell Access | 19 | 2014-09-29 22:19:00 | <p>I have two controllers with the same name:</p>
<p><code>app\controllers\CareersController.php</code> (for public use)
<code>app\controllers\Admin\CareersController.php</code> (for admins)</p>
<p>Because of the naming conflict, I added <code>namespace admin;</code> to the admin controller.</p>
<p>Everything works... | 20,629 | 922,522 | 2021-05-19 07:56:36 | 26,112,371 | 12 | 2014-09-30 03:35:22 | 1,317,935 | 2014-09-30 03:43:49 | https://stackoverflow.com/q/26109816 | https://stackoverflow.com/a/26112371 | <p>You dont need shell access. Artisan includes a <code>dump-autoload</code> function. You can just it via a PHP call within your app:</p>
<pre><code>Route::get('/updateapp', function()
{
\Artisan::call('dump-autoload');
echo 'dump-autoload complete';
});
</code></pre>
<p>Edit: just noticed you wrote <em>"com... | <p>You dont need shell access. Artisan includes a <code>dump-autoload</code> function. You can just it via a PHP call within your app:</p> <pre><code>Route::get('/updateapp', function() { \Artisan::call('dump-autoload'); echo 'dump-autoload complete'; }); </code></pre> <p>Edit: just noticed you wrote <em>"com... | 5, 390, 75151, 78546, 88458 | composer-php, laravel, laravel-4, php, shell | <h1>Laravel, dump-autoload without Shell Access</h1>
<p>I have two controllers with the same name:</p>
<p><code>app\controllers\CareersController.php</code> (for public use)
<code>app\controllers\Admin\CareersController.php</code> (for admins)</p>
<p>Because of the naming conflict, I added <code>namespace admin;</co... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,637 | bash | # Laravel, dump-autoload without Shell Access
I have two controllers with the same name:
`app\controllers\CareersController.php` (for public use)
`app\controllers\Admin\CareersController.php` (for admins)
Because of the naming conflict, I added `namespace admin;` to the admin controller.
Everything works fine local... | You dont need shell access. Artisan includes a `dump-autoload` function. You can just it via a PHP call within your app:
```
Route::get('/updateapp', function()
{
\Artisan::call('dump-autoload');
echo 'dump-autoload complete';
});
```
Edit: just noticed you wrote *"composer isn't installed on the server anywa... |
25794905 | Why does set -e; true && false && true not exit? | 19 | 2014-09-11 18:45:52 | <p>According to <a href="https://stackoverflow.com/a/2871034/274677">this accepted answer</a> using the <code>set -e</code> builtin should suffice for a bash script to exit on the first error. Yet, the following script:</p>
<pre><code>#!/usr/bin/env bash
set -e
echo "a"
echo "b"
echo "about to fail" && /bin/... | 3,890 | 274,677 | 2017-12-04 01:39:00 | 25,795,239 | 12 | 2014-09-11 19:03:47 | 3,030,305 | 2014-09-11 19:43:23 | https://stackoverflow.com/q/25794905 | https://stackoverflow.com/a/25795239 | <p>To simplify EtanReisner's detailed answer, <code>set -e</code> only exits on an 'uncaught' error. In your case:</p>
<pre><code>echo "about to fail" && /bin/false && echo "foo"
</code></pre>
<p>The failing code, <code>/bin/false</code>, is followed by <code>&&</code> which tests its exit co... | <p>To simplify EtanReisner's detailed answer, <code>set -e</code> only exits on an 'uncaught' error. In your case:</p> <pre><code>echo "about to fail" && /bin/false && echo "foo" </code></pre> <p>The failing code, <code>/bin/false</code>, is followed by <code>&&</code> which tests its exit co... | 387 | bash | <h1>Why does set -e; true && false && true not exit?</h1>
<p>According to <a href="https://stackoverflow.com/a/2871034/274677">this accepted answer</a> using the <code>set -e</code> builtin should suffice for a bash script to exit on the first error. Yet, the following script:</p>
<pre><code>#!/usr/bin/env bash
set -... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,638 | bash | # Why does set -e; true && false && true not exit?
According to [this accepted answer](https://stackoverflow.com/a/2871034/274677) using the `set -e` builtin should suffice for a bash script to exit on the first error. Yet, the following script:
```
#!/usr/bin/env bash
set -e
echo "a"
echo "b"
echo "about to fail" ... | To simplify EtanReisner's detailed answer, `set -e` only exits on an 'uncaught' error. In your case:
```
echo "about to fail" && /bin/false && echo "foo"
```
The failing code, `/bin/false`, is followed by `&&` which tests its exit code. Since `&&` tests the exit code, the assumption is that the programmer knew what h... |
4511498 | Powershell Invoke-Sqlcmd capture verbose output | 19 | 2010-12-22 16:50:04 | <p>I'm trying to capture the verbose output from the Invoke-Sqlcmd in Powershell. Anyone got any ideas to do this:</p>
<p>i.e. </p>
<pre><code>Invoke-Sqlcmd -Query "PRINT 'Hello World!';" -ServerInstance $Server -verbose > D:\SqlLog.txt
</code></pre>
<p>The SqlLog.txt file should contain the text "Hello World!"... | 61,962 | 287,139 | 2020-03-15 01:09:32 | 4,523,493 | 12 | 2010-12-24 00:34:30 | 4,916 | 2010-12-24 00:34:30 | https://stackoverflow.com/q/4511498 | https://stackoverflow.com/a/4523493 | <p>Since capturing verbose output is not something one can do easily through the native constructs of the PowerShell host, you can always use the programatic access to the <a href="http://msdn.microsoft.com/en-us/library/dd144526(v=VS.85).aspx" rel="noreferrer">PowerShell object</a>. You can then gain access to the fiv... | <p>Since capturing verbose output is not something one can do easily through the native constructs of the PowerShell host, you can always use the programatic access to the <a href="http://msdn.microsoft.com/en-us/library/dd144526(v=VS.85).aspx" rel="noreferrer">PowerShell object</a>. You can then gain access to the fiv... | 526 | powershell | <h1>Powershell Invoke-Sqlcmd capture verbose output</h1>
<p>I'm trying to capture the verbose output from the Invoke-Sqlcmd in Powershell. Anyone got any ideas to do this:</p>
<p>i.e. </p>
<pre><code>Invoke-Sqlcmd -Query "PRINT 'Hello World!';" -ServerInstance $Server -verbose > D:\SqlLog.txt
</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 | 10,639 | bash | # Powershell Invoke-Sqlcmd capture verbose output
I'm trying to capture the verbose output from the Invoke-Sqlcmd in Powershell. Anyone got any ideas to do this:
i.e.
```
Invoke-Sqlcmd -Query "PRINT 'Hello World!';" -ServerInstance $Server -verbose > D:\SqlLog.txt
```
The SqlLog.txt file should contain the text "... | Since capturing verbose output is not something one can do easily through the native constructs of the PowerShell host, you can always use the programatic access to the [PowerShell object](http://msdn.microsoft.com/en-us/library/dd144526(v=VS.85).aspx). You can then gain access to the five different streams of informat... |
2675552 | Avoid line breaks when using out-file | 19 | 2010-04-20 13:44:32 | <p>I'm getting a little frustrated on a little PowerShell script I'm writing.</p>
<p>Basically I loop through text files to check every line against an array of regular expression patterns.
The result gets piped to the out-file cmdlet which appends it to another text file.</p>
<pre><code>Get-ChildItem $logdir -Recurse ... | 19,776 | 82,820 | 2024-01-25 21:41:18 | 2,678,074 | 12 | 2010-04-20 19:37:35 | 75,224 | 2010-04-20 19:37:35 | https://stackoverflow.com/q/2675552 | https://stackoverflow.com/a/2678074 | <p>Why don't you use <code>Add-Content</code>?</p>
<pre><code>gci $logdir -rec *.txt | gc | select-string $pattern | add-content $csvpath
</code></pre>
<p>You don't need to specify the width and <code>-append</code> switch, the file size is not doubled by default (although you can specify encoding) and it seems that ... | <p>Why don't you use <code>Add-Content</code>?</p> <pre><code>gci $logdir -rec *.txt | gc | select-string $pattern | add-content $csvpath </code></pre> <p>You don't need to specify the width and <code>-append</code> switch, the file size is not doubled by default (although you can specify encoding) and it seems that ... | 526, 9313 | line-breaks, powershell | <h1>Avoid line breaks when using out-file</h1>
<p>I'm getting a little frustrated on a little PowerShell script I'm writing.</p>
<p>Basically I loop through text files to check every line against an array of regular expression patterns.
The result gets piped to the out-file cmdlet which appends it to another text file.... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,640 | bash | # Avoid line breaks when using out-file
I'm getting a little frustrated on a little PowerShell script I'm writing.
Basically I loop through text files to check every line against an array of regular expression patterns.
The result gets piped to the out-file cmdlet which appends it to another text file.
```
Get-Child... | Why don't you use `Add-Content`?
```
gci $logdir -rec *.txt | gc | select-string $pattern | add-content $csvpath
```
You don't need to specify the width and `-append` switch, the file size is not doubled by default (although you can specify encoding) and it seems that there is no problem with the empty lines like you... |
2644742 | Getting ID of an instance newly launched with ec2-api-tools | 19 | 2010-04-15 11:19:16 | <p>I'm launching an EC2 instance, by invoking <a href="http://docs.amazonwebservices.com/AWSEC2/latest/CommandLineReference/index.html?ApiReference-cmd-RunInstances.html" rel="noreferrer"><code>ec2-run-instances</code></a> from simple a bash script, and want to perform further operations on that instance (e.g. associa... | 9,074 | 56,285 | 2018-10-30 12:31:05 | 2,644,798 | 12 | 2010-04-15 11:29:06 | 56,285 | 2010-04-15 12:12:51 | https://stackoverflow.com/q/2644742 | https://stackoverflow.com/a/2644798 | <p>Ok, at least something like this should work:</p>
<pre><code>instance_id=$(ec2-run-instances ami-dd8ea5a9 [...] | awk '/INSTANCE/{print $2}')
</code></pre>
<p>Admittedly I was a bit lazy thinking that it's quicker to ask on SO than to relearn some AWK basics... :-)</p>
<p><strong>Edit</strong>: simplified AWK us... | <p>Ok, at least something like this should work:</p> <pre><code>instance_id=$(ec2-run-instances ami-dd8ea5a9 [...] | awk '/INSTANCE/{print $2}') </code></pre> <p>Admittedly I was a bit lazy thinking that it's quicker to ask on SO than to relearn some AWK basics... :-)</p> <p><strong>Edit</strong>: simplified AWK us... | 387, 531, 990, 12375, 54462 | amazon-ec2, awk, bash, ec2-api-tools, scripting | <h1>Getting ID of an instance newly launched with ec2-api-tools</h1>
<p>I'm launching an EC2 instance, by invoking <a href="http://docs.amazonwebservices.com/AWSEC2/latest/CommandLineReference/index.html?ApiReference-cmd-RunInstances.html" rel="noreferrer"><code>ec2-run-instances</code></a> from simple a bash script, ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,641 | bash | # Getting ID of an instance newly launched with ec2-api-tools
I'm launching an EC2 instance, by invoking [`ec2-run-instances`](http://docs.amazonwebservices.com/AWSEC2/latest/CommandLineReference/index.html?ApiReference-cmd-RunInstances.html) from simple a bash script, and want to perform further operations on that in... | Ok, at least something like this should work:
```
instance_id=$(ec2-run-instances ami-dd8ea5a9 [...] | awk '/INSTANCE/{print $2}')
```
Admittedly I was a bit lazy thinking that it's quicker to ask on SO than to relearn some AWK basics... :-)
**Edit**: simplified AWK usage as Dennis suggested. Also, using `$()` inste... |
37976241 | Writing data to file in Dockerfile | 18 | 2016-06-22 18:59:13 | <p>I have a shell script, script.sh, that writes some lines to a file:</p>
<pre><code>#!/usr/bin/env bash
printf "blah
blah
blah
blah\n" | sudo tee file.txt
</code></pre>
<p>Now in my Dockerfile, I add this script and run it, then attempt to add the generated <code>file.txt</code>:</p>
<pre><code>ADD script.sh .
... | 59,042 | 6,460,141 | 2023-02-20 20:02:52 | 37,992,764 | 12 | 2016-06-23 13:15:26 | 2,227,804 | 2023-02-20 20:02:52 | https://stackoverflow.com/q/37976241 | https://stackoverflow.com/a/37992764 | <p>When you <code>RUN chmod 755 script.sh && ./script.sh</code> it actually execute this script <strong>inside</strong> the docker container (ie: in the docker layer).</p>
<p>When you <code>ADD file.txt .</code> you are trying to add a file from your <strong>local</strong> filesystem inside the docker container... | <p>When you <code>RUN chmod 755 script.sh && ./script.sh</code> it actually execute this script <strong>inside</strong> the docker container (ie: in the docker layer).</p> <p>When you <code>ADD file.txt .</code> you are trying to add a file from your <strong>local</strong> filesystem inside the docker container... | 387, 390, 33304, 90304, 108477 | bash, docker, dockerfile, file-writing, shell | <h1>Writing data to file in Dockerfile</h1>
<p>I have a shell script, script.sh, that writes some lines to a file:</p>
<pre><code>#!/usr/bin/env bash
printf "blah
blah
blah
blah\n" | sudo tee file.txt
</code></pre>
<p>Now in my Dockerfile, I add this script and run it, then attempt to add the generated <code>file.... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,642 | bash | # Writing data to file in Dockerfile
I have a shell script, script.sh, that writes some lines to a file:
```
#!/usr/bin/env bash
printf "blah
blah
blah
blah\n" | sudo tee file.txt
```
Now in my Dockerfile, I add this script and run it, then attempt to add the generated `file.txt`:
```
ADD script.sh .
RUN chmod 7... | When you `RUN chmod 755 script.sh && ./script.sh` it actually execute this script **inside** the docker container (ie: in the docker layer).
When you `ADD file.txt .` you are trying to add a file from your **local** filesystem inside the docker container (ie: in a new docker layer).
You can't do that because the `fil... |
21273826 | How to create a remote server on LAN instead of using GitHub? | 18 | 2014-01-22 03:51:56 | <p>Can I create my own remote server instead of using GitHub? </p>
<p>i.e Can I make a remote server on LAN where 3 computers are sharing a drive on a network to do the collaborative work using Gitbash? </p>
| 21,202 | 1,754,902 | 2020-06-02 00:04:53 | 21,274,699 | 12 | 2014-01-22 05:12:28 | 735,336 | 2018-03-19 21:34:22 | https://stackoverflow.com/q/21273826 | https://stackoverflow.com/a/21274699 | <p>There are several ways to do this</p>
<ol>
<li>Host internal repositories like <a href="http://gitlab.com" rel="noreferrer">Gitlab</a> or <a href="https://www.atlassian.com/software/stash" rel="noreferrer">Stash</a>. This will be similar to services like BitBucket or GitHub</li>
<li>If you want to have a simple ser... | <p>There are several ways to do this</p> <ol> <li>Host internal repositories like <a href="http://gitlab.com" rel="noreferrer">Gitlab</a> or <a href="https://www.atlassian.com/software/stash" rel="noreferrer">Stash</a>. This will be similar to services like BitBucket or GitHub</li> <li>If you want to have a simple ser... | 119, 131, 2090, 61874 | collaboration, git, git-bash, lan | <h1>How to create a remote server on LAN instead of using GitHub?</h1>
<p>Can I create my own remote server instead of using GitHub? </p>
<p>i.e Can I make a remote server on LAN where 3 computers are sharing a drive on a network to do the collaborative work using Gitbash? </p>
| q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,643 | bash | # How to create a remote server on LAN instead of using GitHub?
Can I create my own remote server instead of using GitHub?
i.e Can I make a remote server on LAN where 3 computers are sharing a drive on a network to do the collaborative work using Gitbash? | There are several ways to do this
1. Host internal repositories like [Gitlab](http://gitlab.com) or [Stash](https://www.atlassian.com/software/stash). This will be similar to services like BitBucket or GitHub
2. If you want to have a simple service with SSH authentication - user3159253 has already answered that
3. A v... |
15969662 | Assure only 1 instance of PowerShell Script is Running at any given Time | 18 | 2013-04-12 11:01:56 | <p>I am writing a batch script in PowerShell v1 that will get scheduled to run let's say once every minute. Inevitably, there will come a time when the job needs more than 1 minute to complete and now we have two instances of the script running, and then possibly 3, etc...</p>
<p>I want to avoid this by having the scr... | 18,115 | 155,409 | 2023-09-07 19:27:33 | 15,970,187 | 12 | 2013-04-12 11:28:45 | 9,833 | 2013-04-12 11:28:45 | https://stackoverflow.com/q/15969662 | https://stackoverflow.com/a/15970187 | <p>If the script was launched using the powershell.exe -File switch, you can detect all powershell instances that have the script name present in the process commandline property:</p>
<pre><code>Get-WmiObject Win32_Process -Filter "Name='powershell.exe' AND CommandLine LIKE '%script.ps1%'"
</code></pre>
| <p>If the script was launched using the powershell.exe -File switch, you can detect all powershell instances that have the script name present in the process commandline property:</p> <pre><code>Get-WmiObject Win32_Process -Filter "Name='powershell.exe' AND CommandLine LIKE '%script.ps1%'" </code></pre> | 64, 526 | powershell, windows | <h1>Assure only 1 instance of PowerShell Script is Running at any given Time</h1>
<p>I am writing a batch script in PowerShell v1 that will get scheduled to run let's say once every minute. Inevitably, there will come a time when the job needs more than 1 minute to complete and now we have two instances of the script r... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,644 | bash | # Assure only 1 instance of PowerShell Script is Running at any given Time
I am writing a batch script in PowerShell v1 that will get scheduled to run let's say once every minute. Inevitably, there will come a time when the job needs more than 1 minute to complete and now we have two instances of the script running, a... | If the script was launched using the powershell.exe -File switch, you can detect all powershell instances that have the script name present in the process commandline property:
```
Get-WmiObject Win32_Process -Filter "Name='powershell.exe' AND CommandLine LIKE '%script.ps1%'"
``` |
4491908 | Performance Comparison of Shell Scripts vs high level interpreted langs (C#/Java/etc.) | 18 | 2010-12-20 16:57:17 | <p>First - This is not meant to be a 'which is better, ignorant nonionic war thread'... But rather, I generally need help in making an architecture decision / argument to put forward to my boss.</p>
<p>Skipping the details - I simply just would love to know and find the results of anyone who has done some performance ... | 17,484 | 191,206 | 2014-12-17 22:35:24 | 4,502,777 | 12 | 2010-12-21 18:45:50 | 63,471 | 2010-12-21 18:52:01 | https://stackoverflow.com/q/4491908 | https://stackoverflow.com/a/4502777 | <p>Once upon a time, ye olde The Great Computer Language Shootout did include some shell scripts. </p>
<p>So, courtesy of the <a href="http://web.archive.org/web/20040814112219/shootout.alioth.debian.org/craps.php" rel="noreferrer">Internet Archive, <strong>from 2004</strong></a> -</p>
<p><strong>Note</strong> the sh... | <p>Once upon a time, ye olde The Great Computer Language Shootout did include some shell scripts. </p> <p>So, courtesy of the <a href="http://web.archive.org/web/20040814112219/shootout.alioth.debian.org/craps.php" rel="noreferrer">Internet Archive, <strong>from 2004</strong></a> -</p> <p><strong>Note</strong> the sh... | 9, 17, 390, 598, 4407 | c#, interpreted-language, java, performance, shell | <h1>Performance Comparison of Shell Scripts vs high level interpreted langs (C#/Java/etc.)</h1>
<p>First - This is not meant to be a 'which is better, ignorant nonionic war thread'... But rather, I generally need help in making an architecture decision / argument to put forward to my boss.</p>
<p>Skipping the details ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,645 | bash | # Performance Comparison of Shell Scripts vs high level interpreted langs (C#/Java/etc.)
First - This is not meant to be a 'which is better, ignorant nonionic war thread'... But rather, I generally need help in making an architecture decision / argument to put forward to my boss.
Skipping the details - I simply just ... | Once upon a time, ye olde The Great Computer Language Shootout did include some shell scripts.
So, courtesy of the [Internet Archive, **from 2004**](http://web.archive.org/web/20040814112219/shootout.alioth.debian.org/craps.php) -
**Note** the shell scripts didn't have programs for many of the tests.
```
Score M... |
4257098 | How to pass variables from python script to bash script | 18 | 2010-11-23 14:38:51 | <p>I have a bash script, a.sh , and in it I have call a python script b.py .
The python script calculates something, and I want it to return a value that will be used later in a.sh .
I know I can do</p>
<p>In a.sh:</p>
<pre><code>var=`python b.py`
</code></pre>
<p>In b.py:</p>
<pre><code>print x # when x is the val... | 29,862 | 170,102 | 2022-01-20 07:46:08 | 4,257,122 | 12 | 2010-11-23 14:42:55 | 456,188 | 2010-11-23 15:35:56 | https://stackoverflow.com/q/4257098 | https://stackoverflow.com/a/4257122 | <p>I would print it to a file chosen on the command line then I'd get that value in bash with something like <code>cat</code>.</p>
<p>So you'd go:</p>
<pre><code>python b.py tempfile.txt
var=`cat tempfile.txt`
rm tempfile.txt
</code></pre>
<p><strong>[EDIT, another idea based on other answers]</strong></p>
<p>Your ... | <p>I would print it to a file chosen on the command line then I'd get that value in bash with something like <code>cat</code>.</p> <p>So you'd go:</p> <pre><code>python b.py tempfile.txt var=`cat tempfile.txt` rm tempfile.txt </code></pre> <p><strong>[EDIT, another idea based on other answers]</strong></p> <p>Your ... | 16, 276, 387 | bash, python, variables | <h1>How to pass variables from python script to bash script</h1>
<p>I have a bash script, a.sh , and in it I have call a python script b.py .
The python script calculates something, and I want it to return a value that will be used later in a.sh .
I know I can do</p>
<p>In a.sh:</p>
<pre><code>var=`python b.py`
</cod... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,646 | bash | # How to pass variables from python script to bash script
I have a bash script, a.sh , and in it I have call a python script b.py .
The python script calculates something, and I want it to return a value that will be used later in a.sh .
I know I can do
In a.sh:
```
var=`python b.py`
```
In b.py:
```
print x # whe... | I would print it to a file chosen on the command line then I'd get that value in bash with something like `cat`.
So you'd go:
```
python b.py tempfile.txt
var=`cat tempfile.txt`
rm tempfile.txt
```
**[EDIT, another idea based on other answers]**
Your other option is to format your output carefully so you can use ba... |
46029517 | Docker - run error on window git bash for -v | 17 | 2017-09-04 02:20:50 | <p><a href="https://i.sstatic.net/DQcmW.png" rel="noreferrer"><img src="https://i.sstatic.net/DQcmW.png" alt="error pic"></a></p>
<p>I run docker in my win10, but use <code>-v</code> params has a error.</p>
<pre><code>docker run --privileged=true -d --name=ubuntu14.04 -v e:/docker/data:/data ubuntu /bin/bash
</code><... | 11,346 | 6,488,200 | 2022-06-25 05:11:39 | 46,030,672 | 12 | 2017-09-04 05:20:55 | 6,309 | 2017-09-04 07:09:20 | https://stackoverflow.com/q/46029517 | https://stackoverflow.com/a/46030672 | <p>If possible, try the same command in a regular DOS session, instead of a git bash.</p>
<p>That will avoid the git bash session to automatically resolve <code>/bin/bash</code> to <code>C:/Program Files/Git/usr/bin/bash</code>, which won't be known at all by the ubuntu container.</p>
<p>The OP confirms this is worki... | <p>If possible, try the same command in a regular DOS session, instead of a git bash.</p> <p>That will avoid the git bash session to automatically resolve <code>/bin/bash</code> to <code>C:/Program Files/Git/usr/bin/bash</code>, which won't be known at all by the ubuntu container.</p> <p>The OP confirms this is worki... | 64, 119, 387, 90304 | bash, docker, git, windows | <h1>Docker - run error on window git bash for -v</h1>
<p><a href="https://i.sstatic.net/DQcmW.png" rel="noreferrer"><img src="https://i.sstatic.net/DQcmW.png" alt="error pic"></a></p>
<p>I run docker in my win10, but use <code>-v</code> params has a error.</p>
<pre><code>docker run --privileged=true -d --name=ubuntu1... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,647 | bash | # Docker - run error on window git bash for -v
[](https://i.sstatic.net/DQcmW.png)
I run docker in my win10, but use `-v` params has a error.
```
docker run --privileged=true -d --name=ubuntu14.04 -v e:/docker/data:/data ubuntu /bin/bash
```
error:
```
C:\Program Files\... | If possible, try the same command in a regular DOS session, instead of a git bash.
That will avoid the git bash session to automatically resolve `/bin/bash` to `C:/Program Files/Git/usr/bin/bash`, which won't be known at all by the ubuntu container.
The OP confirms this is working, provided the following options are ... |
28719148 | What does the at-sign @ mean in the bash command: date --date @...? | 17 | 2015-02-25 12:33:36 | <p>Searching the internet I found explanations only for '$@', meaning 'expand to positional parameters'. But I couldn't find anything about the @ sign by itself.</p>
<p>I stumbled over it in the third snipped of the accepted answer to this question:
<a href="https://superuser.com/questions/611538/is-there-a-way-to-dis... | 19,480 | 1,785,730 | 2023-03-16 22:14:26 | 28,719,325 | 12 | 2015-02-25 12:41:58 | 1,258,041 | 2015-02-25 12:47:33 | https://stackoverflow.com/q/28719148 | https://stackoverflow.com/a/28719325 | <p>In the context you show, the <code>@</code> is in the beginning of the <code>--date</code> argument to the <code>date</code> command:</p>
<pre><code>date -u --date @$((`date +%s` - $date1)) +%H:%M:%S
</code></pre>
<p>In that case it means that the argument should be treated as the number of seconds since epoch, se... | <p>In the context you show, the <code>@</code> is in the beginning of the <code>--date</code> argument to the <code>date</code> command:</p> <pre><code>date -u --date @$((`date +%s` - $date1)) +%H:%M:%S </code></pre> <p>In that case it means that the argument should be treated as the number of seconds since epoch, se... | 387 | bash | <h1>What does the at-sign @ mean in the bash command: date --date @...?</h1>
<p>Searching the internet I found explanations only for '$@', meaning 'expand to positional parameters'. But I couldn't find anything about the @ sign by itself.</p>
<p>I stumbled over it in the third snipped of the accepted answer to this qu... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,648 | bash | # What does the at-sign @ mean in the bash command: date --date @...?
Searching the internet I found explanations only for '$@', meaning 'expand to positional parameters'. But I couldn't find anything about the @ sign by itself.
I stumbled over it in the third snipped of the accepted answer to this question:
<https:/... | In the context you show, the `@` is in the beginning of the `--date` argument to the `date` command:
```
date -u --date @$((`date +%s` - $date1)) +%H:%M:%S
```
In that case it means that the argument should be treated as the number of seconds since epoch, see an example in `man date`:
> Convert seconds since the epo... |
26372360 | Powershell script indentation for long strings | 17 | 2014-10-14 23:58:24 | <p>This problem does not have to be solved this way, but it would save me a lot of precious time if it can be:</p>
<p>I have been logging "line at a time" to a log file. Like this:</p>
<pre><code>$mylogentry = "A string of text containing information"
$mylogentry | out-file -append $log_file_path
$array_of_log_entrie... | 21,194 | 3,413,047 | 2019-03-28 13:03:18 | 26,373,425 | 12 | 2014-10-15 02:17:34 | 3,905,079 | 2014-10-15 10:42:30 | https://stackoverflow.com/q/26372360 | https://stackoverflow.com/a/26373425 |
<p>You can't escape away the tabs or spaces you inserted into the string; they're inside the quotes and part of the string now (and so are the line breaks for that matter).</p>
<h2>You have a few options:</h2>
<ol>
<li>Don't break the string at all; let it ride. Obviously not what you want to do, but it works.</li>... | <p>You can't escape away the tabs or spaces you inserted into the string; they're inside the quotes and part of the string now (and so are the line breaks for that matter).</p> <h2>You have a few options:</h2> <ol> <li>Don't break the string at all; let it ride. Obviously not what you want to do, but it works.</li>... | 526 | powershell | <h1>Powershell script indentation for long strings</h1>
<p>This problem does not have to be solved this way, but it would save me a lot of precious time if it can be:</p>
<p>I have been logging "line at a time" to a log file. Like this:</p>
<pre><code>$mylogentry = "A string of text containing information"
$mylogentr... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,649 | bash | # Powershell script indentation for long strings
This problem does not have to be solved this way, but it would save me a lot of precious time if it can be:
I have been logging "line at a time" to a log file. Like this:
```
$mylogentry = "A string of text containing information"
$mylogentry | out-file -append $log_f... | You can't escape away the tabs or spaces you inserted into the string; they're inside the quotes and part of the string now (and so are the line breaks for that matter).
## You have a few options:
1. Don't break the string at all; let it ride. Obviously not what you want to do, but it works.
2. Use @Matt's suggestion... |
22629240 | piping from stdin to a python code in a bash script | 17 | 2014-03-25 08:42:50 | <p>I have a bash script, f, that contains python code. That python code reads from standard input. I want to be able to call my bash script as follows:</p>
<pre><code>f input.txt > output.txt
</code></pre>
<p>In the example above, the python code will read from input.txt and will write to output.txt. </p>
<p>I'm ... | 26,656 | 2,699,231 | 2023-07-05 04:05:51 | 22,629,930 | 12 | 2014-03-25 09:14:00 | 2,836,621 | 2014-03-25 22:01:46 | https://stackoverflow.com/q/22629240 | https://stackoverflow.com/a/22629930 | <p><strong>Updated Answer</strong></p>
<p>If you absolutely must run the way you ask, you could do something like this:</p>
<pre><code>#!/bin/bash
python -c 'import os
for i in range(3):
for j in range(3):
print(i + j)
' < "$1"
</code></pre>
<p><strong>Original Answer</strong></p>
<p>Save your python co... | <p><strong>Updated Answer</strong></p> <p>If you absolutely must run the way you ask, you could do something like this:</p> <pre><code>#!/bin/bash python -c 'import os for i in range(3): for j in range(3): print(i + j) ' < "$1" </code></pre> <p><strong>Original Answer</strong></p> <p>Save your python co... | 16, 387 | bash, python | <h1>piping from stdin to a python code in a bash script</h1>
<p>I have a bash script, f, that contains python code. That python code reads from standard input. I want to be able to call my bash script as follows:</p>
<pre><code>f input.txt > output.txt
</code></pre>
<p>In the example above, the python code will re... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,650 | bash | # piping from stdin to a python code in a bash script
I have a bash script, f, that contains python code. That python code reads from standard input. I want to be able to call my bash script as follows:
```
f input.txt > output.txt
```
In the example above, the python code will read from input.txt and will write to ... | **Updated Answer**
If you absolutely must run the way you ask, you could do something like this:
```
#!/bin/bash
python -c 'import os
for i in range(3):
for j in range(3):
print(i + j)
' < "$1"
```
**Original Answer**
Save your python code in a file called `script.py` and change your script `f` to this:
`... |
10571335 | How to get a list of available files using wget or curl? | 17 | 2012-05-13 11:28:03 | <p>I'd like to know if it's possible to do an <code>ls</code> of a URL, so I can see what *.js files are available in a website, for example. Something like:</p>
<pre><code>wget --list-files -A.js stackoverflow.com
</code></pre>
<p>and get</p>
<pre><code>ajax/libs/jquery/1.7.1/jquery.min.js
js/full.js
js/stub.js
...... | 65,293 | 355,567 | 2020-11-23 15:50:08 | 10,571,500 | 12 | 2012-05-13 11:55:24 | 1,172,002 | 2012-05-13 11:55:24 | https://stackoverflow.com/q/10571335 | https://stackoverflow.com/a/10571500 | <p>You can't do the equivalent of an <code>ls</code> unless the server provides such listings itself. You could however retrieve <code>index.html</code> and then check for includes, e.g. something like</p>
<pre><code>wget -O - http://www.example.com | grep "type=.\?text/javascript.\?"
</code></pre>
<p>Note that this ... | <p>You can't do the equivalent of an <code>ls</code> unless the server provides such listings itself. You could however retrieve <code>index.html</code> and then check for includes, e.g. something like</p> <pre><code>wget -O - http://www.example.com | grep "type=.\?text/javascript.\?" </code></pre> <p>Note that this ... | 387, 391, 1554, 5583 | bash, curl, terminal, wget | <h1>How to get a list of available files using wget or curl?</h1>
<p>I'd like to know if it's possible to do an <code>ls</code> of a URL, so I can see what *.js files are available in a website, for example. Something like:</p>
<pre><code>wget --list-files -A.js stackoverflow.com
</code></pre>
<p>and get</p>
<pre><c... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,651 | bash | # How to get a list of available files using wget or curl?
I'd like to know if it's possible to do an `ls` of a URL, so I can see what *.js files are available in a website, for example. Something like:
```
wget --list-files -A.js stackoverflow.com
```
and get
```
ajax/libs/jquery/1.7.1/jquery.min.js
js/full.js
js/... | You can't do the equivalent of an `ls` unless the server provides such listings itself. You could however retrieve `index.html` and then check for includes, e.g. something like
```
wget -O - http://www.example.com | grep "type=.\?text/javascript.\?"
```
Note that this relies on the HTML being formatted in a certain w... |
9690756 | How to run Java from Cygwin | 17 | 2012-03-13 19:31:54 | <p>I'm trying to write a BASH script to get my Java program to run(common issue, right?). I just can't quite get it to work. After many edits, here's how I am trying to set the classpath and then execute the program:</p>
<pre><code>java -classpath 'cygpath -u "/cygdrive/c/Projects/common/lib/rome-1.0.jar:/cygdrive
/... | 22,837 | 959,792 | 2016-12-19 23:46:04 | 9,690,985 | 12 | 2012-03-13 19:48:00 | 203,654 | 2012-03-13 20:00:18 | https://stackoverflow.com/q/9690756 | https://stackoverflow.com/a/9690985 | <ul>
<li>Java classpath uses semicolon as the token separator.</li>
<li>Use backticks instead of single quotes</li>
</ul>
<p>Try:</p>
<pre><code>java -classpath `cygpath -u "/cygdrive/c/Projects/common/lib/rome-1.0.jar;/cygdrive
/c/Projects/common/lib/jdom-1.0.jar;/cygdrive/c/Projects/common/lib/jsoup-1.6.1.jar;
/cyg... | <ul> <li>Java classpath uses semicolon as the token separator.</li> <li>Use backticks instead of single quotes</li> </ul> <p>Try:</p> <pre><code>java -classpath `cygpath -u "/cygdrive/c/Projects/common/lib/rome-1.0.jar;/cygdrive /c/Projects/common/lib/jdom-1.0.jar;/cygdrive/c/Projects/common/lib/jsoup-1.6.1.jar; /cyg... | 17, 387, 1731, 8005 | bash, classpath, cygwin, java | <h1>How to run Java from Cygwin</h1>
<p>I'm trying to write a BASH script to get my Java program to run(common issue, right?). I just can't quite get it to work. After many edits, here's how I am trying to set the classpath and then execute the program:</p>
<pre><code>java -classpath 'cygpath -u "/cygdrive/c/Project... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,652 | bash | # How to run Java from Cygwin
I'm trying to write a BASH script to get my Java program to run(common issue, right?). I just can't quite get it to work. After many edits, here's how I am trying to set the classpath and then execute the program:
```
java -classpath 'cygpath -u "/cygdrive/c/Projects/common/lib/rome-1.0.... | - Java classpath uses semicolon as the token separator.
- Use backticks instead of single quotes
Try:
```
java -classpath `cygpath -u "/cygdrive/c/Projects/common/lib/rome-1.0.jar;/cygdrive
/c/Projects/common/lib/jdom-1.0.jar;/cygdrive/c/Projects/common/lib/jsoup-1.6.1.jar;
/cygdrive/c/Projects/common/lib/mysql-conne... |
5978108 | Open Vim from within a Bash shell script | 17 | 2011-05-12 12:38:31 | <p>I want to write a Bash shell script that does the following:</p>
<ol>
<li>Opens a file using Vim;</li>
<li>Writes something into the file;</li>
<li>Saves the file and exits.</li>
</ol>
<pre><code>echo 'About to open a file'
vim file.txt # I need to use vim application to open a file
# Now write something into file.... | 37,051 | 246,365 | 2025-01-15 17:44:59 | 5,978,288 | 12 | 2011-05-12 12:55:36 | 457,352 | 2011-05-12 12:55:36 | https://stackoverflow.com/q/5978108 | https://stackoverflow.com/a/5978288 | <p>Vim has several options:</p>
<ul>
<li><code>-c</code> => pass ex commands. Example: <code>vim myfile.txt -c 'wq'</code> to force the last line of a file to be newline terminated (unless <code>binary</code> is set in some way by a script)</li>
<li><code>-s</code> => play a scriptout that was recorded with <code>-W</... | <p>Vim has several options:</p> <ul> <li><code>-c</code> => pass ex commands. Example: <code>vim myfile.txt -c 'wq'</code> to force the last line of a file to be newline terminated (unless <code>binary</code> is set in some way by a script)</li> <li><code>-s</code> => play a scriptout that was recorded with <code>-W</... | 58, 370, 387 | bash, linux, vim | <h1>Open Vim from within a Bash shell script</h1>
<p>I want to write a Bash shell script that does the following:</p>
<ol>
<li>Opens a file using Vim;</li>
<li>Writes something into the file;</li>
<li>Saves the file and exits.</li>
</ol>
<pre><code>echo 'About to open a file'
vim file.txt # I need to use vim applicati... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,653 | bash | # Open Vim from within a Bash shell script
I want to write a Bash shell script that does the following:
1. Opens a file using Vim;
2. Writes something into the file;
3. Saves the file and exits.
```
echo 'About to open a file'
vim file.txt # I need to use vim application to open a file
# Now write something into fi... | Vim has several options:
- `-c` => pass ex commands. Example: `vim myfile.txt -c 'wq'` to force the last line of a file to be newline terminated (unless `binary` is set in some way by a script)
- `-s` => play a scriptout that was recorded with `-W`. For example, if your file contains `ZZ`, then `vim myfile.txt -s the_... |
5946873 | Include non-0 exit codes in the subsequent bash prompt | 17 | 2011-05-10 07:52:01 | <p>Occasionally, I will run a command that has a lot of output. Occasionally, the last 30-40 lines of that output (a.k.a. the only part of the output I ever really see) is fine, but much further up, there was an error. I'd like to make it easier to notice that the command failed. To do so, I want the return code to be ... | 7,071 | 367,271 | 2017-03-10 20:33:50 | 5,946,917 | 12 | 2011-05-10 07:55:14 | 20,862 | 2011-05-10 07:55:14 | https://stackoverflow.com/q/5946873 | https://stackoverflow.com/a/5946917 | <p>A little bit of <code>printf</code> abuse:</p>
<pre><code>printf '%.*s' $? $?
</code></pre>
| <p>A little bit of <code>printf</code> abuse:</p> <pre><code>printf '%.*s' $? $? </code></pre> | 387, 9938 | bash, command-prompt | <h1>Include non-0 exit codes in the subsequent bash prompt</h1>
<p>Occasionally, I will run a command that has a lot of output. Occasionally, the last 30-40 lines of that output (a.k.a. the only part of the output I ever really see) is fine, but much further up, there was an error. I'd like to make it easier to notice ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,654 | bash | # Include non-0 exit codes in the subsequent bash prompt
Occasionally, I will run a command that has a lot of output. Occasionally, the last 30-40 lines of that output (a.k.a. the only part of the output I ever really see) is fine, but much further up, there was an error. I'd like to make it easier to notice that the ... | A little bit of `printf` abuse:
```
printf '%.*s' $? $?
``` |
4737794 | Redirecting two files to standard input | 17 | 2011-01-19 16:22:06 | <p>There are several unix commands that are designed to operate on two files. Commonly such commands allow the contents for one of the "files" to be read from standard input by using a single dash in place of the file name.</p>
<p>I just came across <a href="http://mywiki.wooledge.org/BashFAQ/036" rel="noreferrer">a ... | 7,920 | 101,186 | 2011-01-19 20:15:40 | 4,738,866 | 12 | 2011-01-19 17:59:51 | 26,428 | 2011-01-19 20:15:40 | https://stackoverflow.com/q/4737794 | https://stackoverflow.com/a/4738866 | <p>Bash, Korn shell (ksh93, anyway) and Z shell all support <a href="http://mywiki.wooledge.org/ProcessSubstitution" rel="noreferrer">process substitution</a>. These appear as files to the utility. Try this:</p>
<pre><code>$ bash -c 'echo <(echo)'
/dev/fd/63
$ ksh -c 'echo <(echo)'
/dev/fd/4
$ zsh -c 'echo <(... | <p>Bash, Korn shell (ksh93, anyway) and Z shell all support <a href="http://mywiki.wooledge.org/ProcessSubstitution" rel="noreferrer">process substitution</a>. These appear as files to the utility. Try this:</p> <pre><code>$ bash -c 'echo <(echo)' /dev/fd/63 $ ksh -c 'echo <(echo)' /dev/fd/4 $ zsh -c 'echo <(... | 387, 10327, 31901 | bash, http-redirect, sh | <h1>Redirecting two files to standard input</h1>
<p>There are several unix commands that are designed to operate on two files. Commonly such commands allow the contents for one of the "files" to be read from standard input by using a single dash in place of the file name.</p>
<p>I just came across <a href="http://myw... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,655 | bash | # Redirecting two files to standard input
There are several unix commands that are designed to operate on two files. Commonly such commands allow the contents for one of the "files" to be read from standard input by using a single dash in place of the file name.
I just came across [a technique](http://mywiki.wooledge... | Bash, Korn shell (ksh93, anyway) and Z shell all support [process substitution](http://mywiki.wooledge.org/ProcessSubstitution). These appear as files to the utility. Try this:
```
$ bash -c 'echo <(echo)'
/dev/fd/63
$ ksh -c 'echo <(echo)'
/dev/fd/4
$ zsh -c 'echo <(echo)'
/proc/self/fd/12
```
You'll see file descri... |
2437976 | Get color output in bash | 17 | 2010-03-13 10:24:14 | <p>when compiling some projects on linux terminal, I get usually a long output consisting of a lot of information. Usually this information is MONOCHROME. I wonder if bash can be modified somehow, so in all outputs or in some specific outputs (like from Makefile, etc) I can get different colors dependeing on, for insta... | 16,145 | 171,546 | 2014-11-19 11:06:19 | 2,438,008 | 12 | 2010-03-13 10:36:00 | 115,698 | 2010-03-13 10:36:00 | https://stackoverflow.com/q/2437976 | https://stackoverflow.com/a/2438008 | <p>Sure, just use Bash functions, like, say this one:</p>
<pre><code>make()
{
pathpat="(/[^/]*)+:[0-9]+"
ccred=$(echo -e "\033[0;31m")
ccyellow=$(echo -e "\033[0;33m")
ccend=$(echo -e "\033[0m")
/usr/bin/make "$@" 2>&1 | sed -E -e "/[Ee]rror[: ]/ s%$pathpat%$ccred&$ccend%g" -e "/[Ww]arning[: ]/ s%... | <p>Sure, just use Bash functions, like, say this one:</p> <pre><code>make() { pathpat="(/[^/]*)+:[0-9]+" ccred=$(echo -e "\033[0;31m") ccyellow=$(echo -e "\033[0;33m") ccend=$(echo -e "\033[0m") /usr/bin/make "$@" 2>&1 | sed -E -e "/[Ee]rror[: ]/ s%$pathpat%$ccred&$ccend%g" -e "/[Ww]arning[: ]/ s%... | 387 | bash | <h1>Get color output in bash</h1>
<p>when compiling some projects on linux terminal, I get usually a long output consisting of a lot of information. Usually this information is MONOCHROME. I wonder if bash can be modified somehow, so in all outputs or in some specific outputs (like from Makefile, etc) I can get differe... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,656 | bash | # Get color output in bash
when compiling some projects on linux terminal, I get usually a long output consisting of a lot of information. Usually this information is MONOCHROME. I wonder if bash can be modified somehow, so in all outputs or in some specific outputs (like from Makefile, etc) I can get different colors... | Sure, just use Bash functions, like, say this one:
```
make()
{
pathpat="(/[^/]*)+:[0-9]+"
ccred=$(echo -e "\033[0;31m")
ccyellow=$(echo -e "\033[0;33m")
ccend=$(echo -e "\033[0m")
/usr/bin/make "$@" 2>&1 | sed -E -e "/[Ee]rror[: ]/ s%$pathpat%$ccred&$ccend%g" -e "/[Ww]arning[: ]/ s%$pathpat%$ccyellow&$ccend... |
55978911 | What does triple-single-quote mean in bash? | 16 | 2019-05-04 02:13:15 | <p>I have seen lots of uses of single and double-quotes in bash, as well as backtick-quotes, but have never seen what follows. What is the meaning of the transcript below, which seems to show that triple-single-quoting is recognized as meaningful by bash and further seems to show that single quotes inside this thing al... | 13,869 | 3,938,923 | 2023-08-25 19:39:55 | 55,978,948 | 12 | 2019-05-04 02:21:29 | 5,249,307 | 2019-05-04 02:21:29 | https://stackoverflow.com/q/55978911 | https://stackoverflow.com/a/55978948 | <p>There is no “triple quote” ... for example <code>''' '$Q' '''</code> is the concatenation of several strings ... <code>''</code>, <code>' '</code>, <code>$Q</code>, <code>' '</code> and <code>''</code>. Consider each of the others in the same way.</p>
| <p>There is no “triple quote” ... for example <code>''' '$Q' '''</code> is the concatenation of several strings ... <code>''</code>, <code>' '</code>, <code>$Q</code>, <code>' '</code> and <code>''</code>. Consider each of the others in the same way.</p> | 387, 390 | bash, shell | <h1>What does triple-single-quote mean in bash?</h1>
<p>I have seen lots of uses of single and double-quotes in bash, as well as backtick-quotes, but have never seen what follows. What is the meaning of the transcript below, which seems to show that triple-single-quoting is recognized as meaningful by bash and further ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,657 | bash | # What does triple-single-quote mean in bash?
I have seen lots of uses of single and double-quotes in bash, as well as backtick-quotes, but have never seen what follows. What is the meaning of the transcript below, which seems to show that triple-single-quoting is recognized as meaningful by bash and further seems to ... | There is no “triple quote” ... for example `''' '$Q' '''` is the concatenation of several strings ... `''`, `' '`, `$Q`, `' '` and `''`. Consider each of the others in the same way. |
47744854 | Do here-strings undergo word-splitting? | 16 | 2017-12-11 00:08:16 | <p>Quoting <a href="https://www.gnu.org/software/bash/manual/bash.html#Here-Strings" rel="nofollow noreferrer">Bash Reference Manual</a> and <code>man bash</code> (version 4.3):</p>
<blockquote>
<p><code>[<i>n</i>]<<< <i>word</i></code></p>
<p>The <em><code>word</code></em> undergoes brace expansion, t... | 458 | 6,176,817 | 2018-01-05 17:45:15 | 47,745,181 | 12 | 2017-12-11 01:06:32 | 3,266,847 | 2017-12-11 01:06:32 | https://stackoverflow.com/q/47744854 | https://stackoverflow.com/a/47745181 | <p>The change from splitting here-strings to not splitting them happened between bash-4.4-alpha and bash-4.4-beta. Quoting from <a href="http://git.savannah.gnu.org/cgit/bash.git/tree/CHANGES#n437" rel="noreferrer"><code>CHANGES</code></a>:</p>
<blockquote>
<p>Bash no longer splits the expansion of here-strings, as ... | <p>The change from splitting here-strings to not splitting them happened between bash-4.4-alpha and bash-4.4-beta. Quoting from <a href="http://git.savannah.gnu.org/cgit/bash.git/tree/CHANGES#n437" rel="noreferrer"><code>CHANGES</code></a>:</p> <blockquote> <p>Bash no longer splits the expansion of here-strings, as ... | 58, 387, 97914 | bash, herestring, linux | <h1>Do here-strings undergo word-splitting?</h1>
<p>Quoting <a href="https://www.gnu.org/software/bash/manual/bash.html#Here-Strings" rel="nofollow noreferrer">Bash Reference Manual</a> and <code>man bash</code> (version 4.3):</p>
<blockquote>
<p><code>[<i>n</i>]<<< <i>word</i></code></p>
<p>The <em><c... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,658 | bash | # Do here-strings undergo word-splitting?
Quoting [Bash Reference Manual](https://www.gnu.org/software/bash/manual/bash.html#Here-Strings) and `man bash` (version 4.3):
> `[n]<<< word`
>
> The *`word`* undergoes brace expansion, tilde expansion, parameter and
> variable expansion, command substitution, arithmetic exp... | The change from splitting here-strings to not splitting them happened between bash-4.4-alpha and bash-4.4-beta. Quoting from [`CHANGES`](http://git.savannah.gnu.org/cgit/bash.git/tree/CHANGES#n437):
> Bash no longer splits the expansion of here-strings, as the documentation has always said.
So the manuals of older Ba... |
25595971 | Watch file output in bash terminal as it is being written to the file | 16 | 2014-08-31 20:24:40 | <p>I am asking this question because I remember very clearly having seen someone I worked with do this before I had a very good understanding of linux and the command line.</p>
<p>I am looking for a way to have the content of a file that is being updated sent directly to a terminal rather than simply logged. The clos... | 16,148 | 1,145,948 | 2014-09-01 00:07:07 | 25,596,016 | 12 | 2014-08-31 20:29:22 | 2,970,947 | 2014-08-31 20:29:22 | https://stackoverflow.com/q/25595971 | https://stackoverflow.com/a/25596016 | <p>Use the command <code>tee</code> - from it's <code>man</code> page,</p>
<blockquote>
<p><strong>Synopsis</strong></p>
<pre><code> tee [OPTION]... [FILE]...
</code></pre>
<p><strong>Description</strong></p>
<pre><code> Copy standard input to each FILE, and also to standard output.
</code></pre>
</blockquo... | <p>Use the command <code>tee</code> - from it's <code>man</code> page,</p> <blockquote> <p><strong>Synopsis</strong></p> <pre><code> tee [OPTION]... [FILE]... </code></pre> <p><strong>Description</strong></p> <pre><code> Copy standard input to each FILE, and also to standard output. </code></pre> </blockquo... | 58, 387 | bash, linux | <h1>Watch file output in bash terminal as it is being written to the file</h1>
<p>I am asking this question because I remember very clearly having seen someone I worked with do this before I had a very good understanding of linux and the command line.</p>
<p>I am looking for a way to have the content of a file that is... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,659 | bash | # Watch file output in bash terminal as it is being written to the file
I am asking this question because I remember very clearly having seen someone I worked with do this before I had a very good understanding of linux and the command line.
I am looking for a way to have the content of a file that is being updated s... | Use the command `tee` - from it's `man` page,
> **Synopsis**
>
> ```
> tee [OPTION]... [FILE]...
> ```
>
> **Description**
>
> ```
> Copy standard input to each FILE, and also to standard output.
> ```
Or, you could run `tail -f` on the written file to watch as it is being written (`-f` is follow). |
23850789 | Match a string that contains a newline using sed | 16 | 2014-05-24 23:59:36 | <p>I have a string like this one:</p>
<pre><code> #
pap
</code></pre>
<p>which basically translates to a <code>\t#\n\tpap</code> and I want to replace it with:</p>
<pre><code> #
pap
python
</code></pre>
<p>which translates to <code>\t#\n\tpap\n\tpython</code>.</p>
<p>Tried this with <code>sed</co... | 28,626 | 1,515,697 | 2024-10-04 11:21:23 | 23,850,894 | 12 | 2014-05-25 00:23:02 | 164,835 | 2014-05-25 00:23:02 | https://stackoverflow.com/q/23850789 | https://stackoverflow.com/a/23850894 | <p>try this line with gawk:</p>
<pre><code>awk -v RS="\0" -v ORS="" '{gsub(/\t#\n\tpap/,"yourNEwString")}7' file
</code></pre>
<p>if you want to let <code>sed</code> handle new lines, you have to read the whole file first:</p>
<pre><code>sed ':a;N;$!ba;s/\t#\n\tpap/NewString/g' file
</code></pre>
| <p>try this line with gawk:</p> <pre><code>awk -v RS="\0" -v ORS="" '{gsub(/\t#\n\tpap/,"yourNEwString")}7' file </code></pre> <p>if you want to let <code>sed</code> handle new lines, you have to read the whole file first:</p> <pre><code>sed ':a;N;$!ba;s/\t#\n\tpap/NewString/g' file </code></pre> | 58, 387, 549, 990, 5282 | awk, bash, linux, sed, ubuntu | <h1>Match a string that contains a newline using sed</h1>
<p>I have a string like this one:</p>
<pre><code> #
pap
</code></pre>
<p>which basically translates to a <code>\t#\n\tpap</code> and I want to replace it with:</p>
<pre><code> #
pap
python
</code></pre>
<p>which translates to <code>\t#\n\tp... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,660 | bash | # Match a string that contains a newline using sed
I have a string like this one:
```
#
pap
```
which basically translates to a `\t#\n\tpap` and I want to replace it with:
```
#
pap
python
```
which translates to `\t#\n\tpap\n\tpython`.
Tried this with `sed` in a lot of ways but it's not worki... | try this line with gawk:
```
awk -v RS="\0" -v ORS="" '{gsub(/\t#\n\tpap/,"yourNEwString")}7' file
```
if you want to let `sed` handle new lines, you have to read the whole file first:
```
sed ':a;N;$!ba;s/\t#\n\tpap/NewString/g' file
``` |
14197470 | How does trap / kill work in bash on Linux? | 16 | 2013-01-07 13:59:22 | <p>My sample file</p>
<p>traptest.sh:</p>
<pre><code>#!/bin/bash
trap 'echo trapped' TERM
while :
do
sleep 1000
done
</code></pre>
<p>$ traptest.sh & </p>
<blockquote>
<blockquote>
<p>[1] 4280</p>
</blockquote>
</blockquote>
<p>$ kill %1 <-- kill by job number works</p>
<blockquote>
<block... | 29,146 | 133,700 | 2018-03-20 08:05:32 | 14,198,367 | 12 | 2013-01-07 14:55:53 | 1,280,954 | 2013-01-07 15:13:30 | https://stackoverflow.com/q/14197470 | https://stackoverflow.com/a/14198367 | <pre><code>kill [pid]
</code></pre>
<p>send the TERM signal exclusively to the specified PID.</p>
<pre><code>kill %1
</code></pre>
<p>send the TERM signal to the job #1's entire process group, in this case to the script pid + his children (sleep). </p>
<p>I've verified that with strace on sleep process and on scrip... | <pre><code>kill [pid] </code></pre> <p>send the TERM signal exclusively to the specified PID.</p> <pre><code>kill %1 </code></pre> <p>send the TERM signal to the job #1's entire process group, in this case to the script pid + his children (sleep). </p> <p>I've verified that with strace on sleep process and on scrip... | 387 | bash | <h1>How does trap / kill work in bash on Linux?</h1>
<p>My sample file</p>
<p>traptest.sh:</p>
<pre><code>#!/bin/bash
trap 'echo trapped' TERM
while :
do
sleep 1000
done
</code></pre>
<p>$ traptest.sh & </p>
<blockquote>
<blockquote>
<p>[1] 4280</p>
</blockquote>
</blockquote>
<p>$ kill %1 <-... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,661 | bash | # How does trap / kill work in bash on Linux?
My sample file
traptest.sh:
```
#!/bin/bash
trap 'echo trapped' TERM
while :
do
sleep 1000
done
```
$ traptest.sh &
> > [1] 4280
$ kill %1 <-- kill by job number works
> > Terminated
> >
> > trapped
$ traptest.sh &
> > [1] 4280
$ kill 4280 <-- kill by process id... | ```
kill [pid]
```
send the TERM signal exclusively to the specified PID.
```
kill %1
```
send the TERM signal to the job #1's entire process group, in this case to the script pid + his children (sleep).
I've verified that with strace on sleep process and on script process
Anyway, someone got a similar problem her... |
13260974 | How to check if process is running in linux | 16 | 2012-11-06 23:17:45 | <p>I am trying to automatically check if a process is running or not and have to perform next steps accordingly. I had written a bash script but it doesn't seem to work.</p>
<pre><code>if ps aux | grep [M]yProcessName > /dev/null
then
echo "Running"
else
echo "Not running"
fi
</code></pre>
<p>Is my <code>if</c... | 74,042 | 1,026,764 | 2021-08-02 16:00:33 | 13,264,571 | 12 | 2012-11-07 06:51:58 | 841,108 | 2012-11-07 06:51:58 | https://stackoverflow.com/q/13260974 | https://stackoverflow.com/a/13264571 | <p>You don't want to know if a particular process (of known pid) is running (this can be done by testing if <code>/proc/1234/</code> exists for pid 1234) but if some process is running a given command (or a given executable).</p>
<p>Notice that the <a href="http://www.kernel.org/doc/man-pages/online/pages/man2/kill.2.... | <p>You don't want to know if a particular process (of known pid) is running (this can be done by testing if <code>/proc/1234/</code> exists for pid 1234) but if some process is running a given command (or a given executable).</p> <p>Notice that the <a href="http://www.kernel.org/doc/man-pages/online/pages/man2/kill.2.... | 58, 387 | bash, linux | <h1>How to check if process is running in linux</h1>
<p>I am trying to automatically check if a process is running or not and have to perform next steps accordingly. I had written a bash script but it doesn't seem to work.</p>
<pre><code>if ps aux | grep [M]yProcessName > /dev/null
then
echo "Running"
else
echo... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,662 | bash | # How to check if process is running in linux
I am trying to automatically check if a process is running or not and have to perform next steps accordingly. I had written a bash script but it doesn't seem to work.
```
if ps aux | grep [M]yProcessName > /dev/null
then
echo "Running"
else
echo "Not running"
fi
```
... | You don't want to know if a particular process (of known pid) is running (this can be done by testing if `/proc/1234/` exists for pid 1234) but if some process is running a given command (or a given executable).
Notice that the [kill(2)](http://www.kernel.org/doc/man-pages/online/pages/man2/kill.2.html) syscall can be... |
10652492 | Bash Autocompletion - How to pass this array to compgen without significant whitespace being collapsed? | 16 | 2012-05-18 12:17:14 | <p>The following bash completion passes an array of possible words (i.e. completions) to compgen.</p>
<pre><code>basenames=("foo" "fu bar" "baz");
COMPREPLY=($(compgen -W "${basenames[*]}" -- "${COMP_WORDS[COMP_CWORD]}"))
</code></pre>
<p>The problem is that the whitespace in the array elements is not preserved, tha... | 5,892 | 1,178,669 | 2024-01-25 17:58:08 | 11,482,571 | 12 | 2012-07-14 09:26:27 | 1,524,545 | 2012-07-14 09:26:27 | https://stackoverflow.com/q/10652492 | https://stackoverflow.com/a/11482571 | <p>Why bother with <code>compgen</code>? Just add them to COMPREPLY manually. The following will complete the matching filenames from <code>/some/path</code>, handling filenames safely.</p>
<pre><code>some_completion_function() {
local files=("/some/path/$2"*)
[[ -e ${files[0]} ]] && COMPREPLY=( "${fil... | <p>Why bother with <code>compgen</code>? Just add them to COMPREPLY manually. The following will complete the matching filenames from <code>/some/path</code>, handling filenames safely.</p> <pre><code>some_completion_function() { local files=("/some/path/$2"*) [[ -e ${files[0]} ]] && COMPREPLY=( "${fil... | 114, 387, 59778 | arrays, bash, bash-completion | <h1>Bash Autocompletion - How to pass this array to compgen without significant whitespace being collapsed?</h1>
<p>The following bash completion passes an array of possible words (i.e. completions) to compgen.</p>
<pre><code>basenames=("foo" "fu bar" "baz");
COMPREPLY=($(compgen -W "${basenames[*]}" -- "${COMP_WORDS... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,663 | bash | # Bash Autocompletion - How to pass this array to compgen without significant whitespace being collapsed?
The following bash completion passes an array of possible words (i.e. completions) to compgen.
```
basenames=("foo" "fu bar" "baz");
COMPREPLY=($(compgen -W "${basenames[*]}" -- "${COMP_WORDS[COMP_CWORD]}"))
```... | Why bother with `compgen`? Just add them to COMPREPLY manually. The following will complete the matching filenames from `/some/path`, handling filenames safely.
```
some_completion_function() {
local files=("/some/path/$2"*)
[[ -e ${files[0]} ]] && COMPREPLY=( "${files[@]##*/}" )
}
```
It's not possible to ha... |
11213849 | How to ls --ignore on osx | 16 | 2012-06-26 18:35:14 | <p>I'm trying to do the following on OSX:</p>
<p><code>ls -lR --ignore *.app</code></p>
<p>So that I can recursively search through all folders <em>except</em> for .app folders.</p>
<p>However it seems there is seems to be no <code>--ignore</code> or <code>--hide</code> options in Darwin.</p>
<p>Perhaps a script to... | 10,590 | 1,373,278 | 2017-12-29 11:59:59 | 11,213,896 | 12 | 2012-06-26 18:38:37 | 97,337 | 2012-06-26 19:06:29 | https://stackoverflow.com/q/11213849 | https://stackoverflow.com/a/11213896 | <p>Use <code>find</code>:</p>
<pre><code>find . -ls -name '*.app' -prune
</code></pre>
| <p>Use <code>find</code>:</p> <pre><code>find . -ls -name '*.app' -prune </code></pre> | 369, 387, 3589 | bash, ls, macos | <h1>How to ls --ignore on osx</h1>
<p>I'm trying to do the following on OSX:</p>
<p><code>ls -lR --ignore *.app</code></p>
<p>So that I can recursively search through all folders <em>except</em> for .app folders.</p>
<p>However it seems there is seems to be no <code>--ignore</code> or <code>--hide</code> options in ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,664 | bash | # How to ls --ignore on osx
I'm trying to do the following on OSX:
`ls -lR --ignore *.app`
So that I can recursively search through all folders *except* for .app folders.
However it seems there is seems to be no `--ignore` or `--hide` options in Darwin.
Perhaps a script to recursively search one folder deep for a ... | Use `find`:
```
find . -ls -name '*.app' -prune
``` |
10439590 | bash "&" without printing "[1]+ Done " | 16 | 2012-05-03 21:29:46 | <p>I call a script in my .bashrc to print number of new messages I have when I open the terminal, I want the call to be non blocking as it accesses the network and sometimes takes a few seconds which means I can't use the terminal until it completes. </p>
<p>However if I put: </p>
<pre><code> mailcheck &
</co... | 7,703 | 892,545 | 2021-09-18 00:09:44 | 10,439,832 | 12 | 2012-05-03 21:52:34 | 89,817 | 2012-05-03 21:52:34 | https://stackoverflow.com/q/10439590 | https://stackoverflow.com/a/10439832 | <p>That message isn't coming from mailcheck, it's from bash's job control telling you about your backgrounded job. The way to avoid it is to tell bash you don't want it managed by job control:</p>
<pre><code>mailcheck &
disown $!
</code></pre>
| <p>That message isn't coming from mailcheck, it's from bash's job control telling you about your backgrounded job. The way to avoid it is to tell bash you don't want it managed by job control:</p> <pre><code>mailcheck & disown $! </code></pre> | 58, 387, 531 | bash, linux, scripting | <h1>bash "&" without printing "[1]+ Done "</h1>
<p>I call a script in my .bashrc to print number of new messages I have when I open the terminal, I want the call to be non blocking as it accesses the network and sometimes takes a few seconds which means I can't use the terminal until it completes. </p>
<p>However if I... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,665 | bash | # bash "&" without printing "[1]+ Done "
I call a script in my .bashrc to print number of new messages I have when I open the terminal, I want the call to be non blocking as it accesses the network and sometimes takes a few seconds which means I can't use the terminal until it completes.
However if I put:
```
ma... | That message isn't coming from mailcheck, it's from bash's job control telling you about your backgrounded job. The way to avoid it is to tell bash you don't want it managed by job control:
```
mailcheck &
disown $!
``` |
7842919 | Python equivalent to perl -pe? | 16 | 2011-10-20 22:15:26 | <p>I need to pick some numbers out of some text files. I can pick out the lines I need with grep, but didn't know how to extract the numbers from the lines. A colleague showed me how to do this from bash with perl:</p>
<pre><code>cat results.txt | perl -pe 's/.+(\d\.\d+)\.\n/\1 /'
</code></pre>
<p>However, I usually ... | 3,018 | 662,939 | 2021-07-28 20:53:29 | 7,842,937 | 12 | 2011-10-20 22:18:24 | 148,870 | 2011-10-20 22:32:26 | https://stackoverflow.com/q/7842919 | https://stackoverflow.com/a/7842937 | <p>Yes, you can use Python from the command line. <code>python -c <stuff></code> will run <code><stuff></code> as Python code. Example:</p>
<pre><code>python -c "import sys; print sys.path"
</code></pre>
<p>There isn't a direct equivalent to the <code>-p</code> option for Perl (the automatic input/output ... | <p>Yes, you can use Python from the command line. <code>python -c <stuff></code> will run <code><stuff></code> as Python code. Example:</p> <pre><code>python -c "import sys; print sys.path" </code></pre> <p>There isn't a direct equivalent to the <code>-p</code> option for Perl (the automatic input/output ... | 16, 387, 5813 | bash, pipe, python | <h1>Python equivalent to perl -pe?</h1>
<p>I need to pick some numbers out of some text files. I can pick out the lines I need with grep, but didn't know how to extract the numbers from the lines. A colleague showed me how to do this from bash with perl:</p>
<pre><code>cat results.txt | perl -pe 's/.+(\d\.\d+)\.\n/\1 ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,666 | bash | # Python equivalent to perl -pe?
I need to pick some numbers out of some text files. I can pick out the lines I need with grep, but didn't know how to extract the numbers from the lines. A colleague showed me how to do this from bash with perl:
```
cat results.txt | perl -pe 's/.+(\d\.\d+)\.\n/\1 /'
```
However, I u... | Yes, you can use Python from the command line. `python -c <stuff>` will run `<stuff>` as Python code. Example:
```
python -c "import sys; print sys.path"
```
There isn't a direct equivalent to the `-p` option for Perl (the automatic input/output line-by-line processing), but that's mostly because Python doesn't use t... |
7477543 | Bash scripting, loop through files in folder fails | 16 | 2011-09-19 21:30:57 | <p>I'm looping through certain files (all files starting with MOVIE) in a folder with this bash script code:</p>
<pre><code>for i in MY-FOLDER/MOVIE*
do
</code></pre>
<p>which works fine when there are files in the folder. But when there aren't any, it somehow goes on with one file which it thinks is named MY-FOLDER/... | 15,904 | 809,829 | 2019-10-19 15:01:23 | 7,477,615 | 12 | 2011-09-19 21:38:22 | 29,157 | 2019-10-19 15:01:23 | https://stackoverflow.com/q/7477543 | https://stackoverflow.com/a/7477615 | <pre><code>for i in $(find MY-FOLDER/MOVIE -type f); do
echo $i
done
</code></pre>
<p>The <code>find</code> utility is one of the Swiss Army knives of linux. It starts at the directory you give it and finds all files in all subdirectories, according to the options you give it.</p>
<p><code>-type f</code> will find... | <pre><code>for i in $(find MY-FOLDER/MOVIE -type f); do echo $i done </code></pre> <p>The <code>find</code> utility is one of the Swiss Army knives of linux. It starts at the directory you give it and finds all files in all subdirectories, according to the options you give it.</p> <p><code>-type f</code> will find... | 387 | bash | <h1>Bash scripting, loop through files in folder fails</h1>
<p>I'm looping through certain files (all files starting with MOVIE) in a folder with this bash script code:</p>
<pre><code>for i in MY-FOLDER/MOVIE*
do
</code></pre>
<p>which works fine when there are files in the folder. But when there aren't any, it someh... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,667 | bash | # Bash scripting, loop through files in folder fails
I'm looping through certain files (all files starting with MOVIE) in a folder with this bash script code:
```
for i in MY-FOLDER/MOVIE*
do
```
which works fine when there are files in the folder. But when there aren't any, it somehow goes on with one file which it... | ```
for i in $(find MY-FOLDER/MOVIE -type f); do
echo $i
done
```
The `find` utility is one of the Swiss Army knives of linux. It starts at the directory you give it and finds all files in all subdirectories, according to the options you give it.
`-type f` will find only regular files (not directories).
As I wrote... |
7198098 | What is an efficient way to replace list of strings with another list in Unix file? | 16 | 2011-08-25 22:47:57 | <p>Suppose I have two lists of strings (list A and list B) with the exact same number of entries, N, in each list, and I want to replace all occurrences of the the nth element of A with the nth element of B in a file in Unix (ideally using Bash scripting).</p>
<p>What's the most efficient way to do this?</p>
<p>An in... | 16,964 | null | 2012-12-05 18:59:35 | 7,198,895 | 12 | 2011-08-26 00:46:22 | 7,552 | 2011-10-04 15:18:42 | https://stackoverflow.com/q/7198098 | https://stackoverflow.com/a/7198895 | <p>This will do it in one pass. It reads listA and listB into awk arrays, then for each line of the linput, it examines each word and if the word is found in listA, the word is replaced by the corresponding word in listB.</p>
<pre><code>awk '
FILENAME == ARGV[1] { listA[$1] = FNR; next }
FILENAME == ARGV[2] { ... | <p>This will do it in one pass. It reads listA and listB into awk arrays, then for each line of the linput, it examines each word and if the word is found in listA, the word is replaced by the corresponding word in listB.</p> <pre><code>awk ' FILENAME == ARGV[1] { listA[$1] = FNR; next } FILENAME == ARGV[2] { ... | 34, 387, 531, 724 | bash, file-io, scripting, unix | <h1>What is an efficient way to replace list of strings with another list in Unix file?</h1>
<p>Suppose I have two lists of strings (list A and list B) with the exact same number of entries, N, in each list, and I want to replace all occurrences of the the nth element of A with the nth element of B in a file in Unix (i... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,668 | bash | # What is an efficient way to replace list of strings with another list in Unix file?
Suppose I have two lists of strings (list A and list B) with the exact same number of entries, N, in each list, and I want to replace all occurrences of the the nth element of A with the nth element of B in a file in Unix (ideally us... | This will do it in one pass. It reads listA and listB into awk arrays, then for each line of the linput, it examines each word and if the word is found in listA, the word is replaced by the corresponding word in listB.
```
awk '
FILENAME == ARGV[1] { listA[$1] = FNR; next }
FILENAME == ARGV[2] { listB[FNR] = $... |
7096772 | How do I implement tab completion in node.js shell? | 16 | 2011-08-17 17:10:18 | <p>I was looking for this feature in node.js and I haven't found it.<br>
Can I implement it myself? As far as I know, node.js doesn't load any file at it's startup (like Bash does with <code>.bashrc</code>) and I haven't noticed any way to somehow override shell prompt.</p>
<p>Is there a way to implement it without wr... | 5,914 | 666,520 | 2020-11-21 04:34:18 | 7,096,913 | 12 | 2011-08-17 17:25:22 | 492,364 | 2020-11-21 04:34:18 | https://stackoverflow.com/q/7096772 | https://stackoverflow.com/a/7096913 | <p>You could monkey-patch the REPL. Note that you <em>must</em> use the callback version of the <code>completer</code>, otherwise it won't work correctly:</p>
<pre><code>var repl = require('repl').start()
var _completer = repl.completer.bind(repl)
repl.completer = function(line, cb) {
// ...
_completer(line, cb)
}
... | <p>You could monkey-patch the REPL. Note that you <em>must</em> use the callback version of the <code>completer</code>, otherwise it won't work correctly:</p> <pre><code>var repl = require('repl').start() var _completer = repl.completer.bind(repl) repl.completer = function(line, cb) { // ... _completer(line, cb) } ... | 3, 390, 46426 | javascript, node.js, shell | <h1>How do I implement tab completion in node.js shell?</h1>
<p>I was looking for this feature in node.js and I haven't found it.<br>
Can I implement it myself? As far as I know, node.js doesn't load any file at it's startup (like Bash does with <code>.bashrc</code>) and I haven't noticed any way to somehow override sh... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,669 | bash | # How do I implement tab completion in node.js shell?
I was looking for this feature in node.js and I haven't found it.
Can I implement it myself? As far as I know, node.js doesn't load any file at it's startup (like Bash does with `.bashrc`) and I haven't noticed any way to somehow override shell prompt.
Is there ... | You could monkey-patch the REPL. Note that you *must* use the callback version of the `completer`, otherwise it won't work correctly:
```
var repl = require('repl').start()
var _completer = repl.completer.bind(repl)
repl.completer = function(line, cb) {
// ...
_completer(line, cb)
}
``` |
3098713 | How to make AWK use a variable created in Bash Script | 16 | 2010-06-23 03:17:08 | <p>I have script that looks like this</p>
<pre><code>#!/bin/bash
#exampel inputfile is "myfile.txt"
inputfile=$1
basen=`basename $inputfile .txt` # create basename
cat $inputfile |
awk '{print $basen "\t" $3} # this doesn't print "myfile" but the whole content of it.
</code></pre>
<p>What I want to do above is to... | 29,315 | 67,405 | 2023-09-01 06:19:19 | 3,098,771 | 12 | 2010-06-23 03:35:05 | 373,816 | 2017-06-26 17:38:53 | https://stackoverflow.com/q/3098713 | https://stackoverflow.com/a/3098771 | <p>You can use it like this.</p>
<pre><code>for i in `find $1 -name \*.jar`
do
jar tvf $i| awk -F '/' '/class/{print "'${i}'" " " $NF }' >> $classFile
done
</code></pre>
<p>You should use </p>
<blockquote>
<p>"'${i}'"</p>
</blockquote>
<p>in AWK to use the </p>
<blockquote>
<p>$i</p>
</blockquote>
<p>cr... | <p>You can use it like this.</p> <pre><code>for i in `find $1 -name \*.jar` do jar tvf $i| awk -F '/' '/class/{print "'${i}'" " " $NF }' >> $classFile done </code></pre> <p>You should use </p> <blockquote> <p>"'${i}'"</p> </blockquote> <p>in AWK to use the </p> <blockquote> <p>$i</p> </blockquote> <p>cr... | 34, 58, 387, 990 | awk, bash, linux, unix | <h1>How to make AWK use a variable created in Bash Script</h1>
<p>I have script that looks like this</p>
<pre><code>#!/bin/bash
#exampel inputfile is "myfile.txt"
inputfile=$1
basen=`basename $inputfile .txt` # create basename
cat $inputfile |
awk '{print $basen "\t" $3} # this doesn't print "myfile" but the whole... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,670 | bash | # How to make AWK use a variable created in Bash Script
I have script that looks like this
```
#!/bin/bash
#exampel inputfile is "myfile.txt"
inputfile=$1
basen=`basename $inputfile .txt` # create basename
cat $inputfile |
awk '{print $basen "\t" $3} # this doesn't print "myfile" but the whole content of it.
```
... | You can use it like this.
```
for i in `find $1 -name \*.jar`
do
jar tvf $i| awk -F '/' '/class/{print "'${i}'" " " $NF }' >> $classFile
done
```
You should use
> "'${i}'"
in AWK to use the
> $i
created in Bash Script. |
2740868 | Difference between piping a file to sh and calling a shell file | 16 | 2010-04-29 21:24:22 | <p>This is what was trying to do:</p>
<pre><code>$ wget -qO- www.example.com/script.sh | sh
</code></pre>
<p>which quietly downloads the script and prints it to stdout which is then piped to sh. This unfortunately doesn't quite work, failing to wait for user input at various points, aswell as a few syntax errors.</p>... | 11,343 | 117 | 2014-03-01 08:53:58 | 2,741,009 | 12 | 2010-04-29 21:47:25 | 126,769 | 2010-04-29 21:47:25 | https://stackoverflow.com/q/2740868 | https://stackoverflow.com/a/2741009 | <p>When you pipe to <code>sh</code> , stdin of that shell/script will be the pipe. Thus the script cannot take e.g. user input from the console. When you run the script normally, stdin is the console - where you can enter input.</p>
| <p>When you pipe to <code>sh</code> , stdin of that shell/script will be the pipe. Thus the script cannot take e.g. user input from the console. When you run the script normally, stdin is the console - where you can enter input.</p> | 390, 5813 | pipe, shell | <h1>Difference between piping a file to sh and calling a shell file</h1>
<p>This is what was trying to do:</p>
<pre><code>$ wget -qO- www.example.com/script.sh | sh
</code></pre>
<p>which quietly downloads the script and prints it to stdout which is then piped to sh. This unfortunately doesn't quite work, failing to ... | q.PostTypeId = 1; a.PostTypeId = 2; EXISTS tag '%bash%' OR '%shell%'; a.Body contains code block; q.Score > 5; a.Score > 10 | 10,671 | bash | # Difference between piping a file to sh and calling a shell file
This is what was trying to do:
```
$ wget -qO- www.example.com/script.sh | sh
```
which quietly downloads the script and prints it to stdout which is then piped to sh. This unfortunately doesn't quite work, failing to wait for user input at various po... | When you pipe to `sh` , stdin of that shell/script will be the pipe. Thus the script cannot take e.g. user input from the console. When you run the script normally, stdin is the console - where you can enter input. |
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