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I am trying to do:

Fing the pid of process based on something I grep for, lets say "Name":

pid=(ps aux | grep '[Ń]ame' | awk '{print $2}' | head -1)

Then kill it

kill $pid

This works fine if I log into the machine with ssh, but I want to do it from a script. And it doesn't work then:

ssh hostname "pid=\$(ps aux | grep '[N]ame' | awk '{print $2}' | head -1); echo \$pid"
root 11203 1.5 0.8 6961292 135420 pts/0 Sl 16:52 0:04 java -XX:PermSize=256m -XX:MaxPermSize=512m -Dproperties....

I would like to know a way of doing this and why the results are different when doing the command as in the latter case.

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2 Answers

up vote 1 down vote accepted

You can use pgrep to simplify the search and pipe the result with xargs to remove the use of vars, like:

ssh hostname "pgrep emacs | head -1 | xargs echo"

Your main problem is that bash try to evaluate $2 in the ssh command. It results to a blank, so interprets that you want to pipe `awk '{print }' instead. You can also try to execute with another escape character:

ssh hostname "pid=\$(ps aux | grep '[N]ame' | awk '{print \$2}' | head -1); echo \$pid"

That version works.

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killall has a -r option to match process name on a regular expression.

-r, --regexp Interpret process name pattern as an extended regular expression.

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