CODEWITHSUNDEEP
macosshell
Ana
Ana

Reputation: 603

Shell script to kill a process

I need to implement a shell script that kills a process. The problem is that I need to do a conditional to be able to see if the process is running or not.

This is my code, but it is not working:

#!/bin/sh

if [ -x  "MY_PROCCESS_NAME"]; then
    killall MY_PROCCESS_NAME
else
    echo "Doesn't exist"
fi

This is the error:

line 3: [: missing `]'

Upvotes: 2

Views: 14032

Answers (2)

Anya Shenanigans
Anya Shenanigans

Reputation: 94584

to check if a process is running on mac os x you can use:

pid=$(ps -fe | grep 'process name' | grep -v grep | awk '{print $2}')

if you want to reduce the number of shell scripts you can enclose one of the characters of the name of the process in square brackets:

pid=$(ps -fe | grep '[p]rocess name' | awk '{print $2}')

combined in your test this would look like:

pid=$(ps -fe | grep '[p]rocess name' | awk '{print $2}')
if [[ -n $pid ]]; then
    kill $pid
else
    echo "Does not exist"
fi

it's a little more complicated than you would need to do under linux as you generally have the 'pgrep' command, which is the rough equivalent of the 'ps -fe | grep ... | grep -v grep'

Upvotes: 2

matchew
matchew

Reputation: 19645

not sure if it would work in OSX, it works in ubuntu.

but as a one liner:

ps aux | awk '$11~/vim/ {PID = $2} END {if (PID) print "kill -9 "PID; else print "echo no process"}' | bash

what it does is it finds a process, in this case, vim and returns the kill -9 pid if no string is found it returns echo no process it then pipes the output to bash.

Upvotes: 0

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