CODEWITHSUNDEEP
shellgrepps
Subhash
Subhash

Reputation: 588

get process id through Perl script

In my script, I am executing cat, then trying to grep to get the process id.

I used this :

ps | grep -e \'cat$\' | cut -d\' \' -f2 | head -n 1

but it's not returning anything.

Upvotes: 0

Views: 2942

Answers (1)

Joni
Joni

Reputation: 111239

When you start a background process in a shell with program & you can access the PID of the child process through $!.

For example:

bash-4.2.37$ cat &
[1] 9664
bash-4.2.37$ CAT_PID=$!
...time passes...
bash-4.2.37$ echo $CAT_PID
9664

Upvotes: 1

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