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I want a script which kills the instance(s) of ssh which are run with the -D argument (setting up a local proxy).

Manually, I do ps -A | grep -i ssh, look for the instance(s) with -D, and kill -9 {id} each one.

But what does that look like in bash script form?

(I am on Mac OS X but will install any necessary commands via port)

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See pgrep and pkill alternatives on mac os x?. pgrep and pkill are commands to reliably find or kill processes by name under Solaris and Linux. –  Gilles Jan 12 '11 at 8:12

3 Answers 3

up vote 19 down vote accepted

Run pgrep -f "ssh.*-D" and see if that returns the correct process ID. If it does, simply change pgrep to pkill and keep the same options and pattern

Also, you shouldn't use kill -9 aka SIGKILL unless absolutely necessary because programs can't trap SIGKILL to clean up after themselves before they exit. I only use kill -9 after first trying -1 -2 and -3.

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you should redefine kill as a for loop that does kill -i for each i ;) –  Seamus Jan 12 '11 at 14:29
1  
pgrep is not native on OSX, you have to get it from a third party. The previous thread on the topic has proposals and alternatives. –  Gilles Jan 12 '11 at 21:21
    
man alive, the more I use 'nix, the more I love it :) thanks for this! –  javamonkey79 Nov 29 '11 at 19:19
    
pgrep and pkill are available in OS X 10.8 (Mountain Lion) and above. apple.blogoverflow.com/2012/07/… –  Peter Hanley Apr 25 at 18:24

Also,

kill `pgrep -f "ssh.*-D"`
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I think this is equivalent to pkill –  Michael Mrozek Jan 18 '11 at 14:56

You can leverage the proc file system to gather the information. For example:

for proc in $(grep -irl "ssh.*-D" /proc/*/cmdline | grep -v "self"); do if [ -f $proc ]; then cat $proc && echo ""; fi; done

It's not perfect, you'll want a more exclusive regex (especially if you are killing processes) but echo $proc | awk -F'/' '{ print $3 }' will show you the PID of the process(es).

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OSX doesn't have /proc. And there's already a robust tool to do this out there, called pgrep (available natively at least on Solaris and Linux). –  Gilles Jan 12 '11 at 21:20

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