LinuxQuestions.org - usage of kill -0 pid

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taher84

06-28-2011 02:58 AM

usage of kill -0 pid

I was looking into a shell script which had a line "kill -0 [pid]" , I would like to know what the -0 flag does as i found it is not killing the particular [pid] process.

acid_kewpie

06-28-2011 03:29 AM

The null signal can be used to check the validity of the pid.

ssrameez

06-28-2011 03:34 AM

Please have a look at http://linux.die.net/man/2/kill
I am also not much familiar with sig 0.

--Rameez

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