What does this mean in shell script: trap "rm -f $pidfile" 0 1 3 15

Question

I was looking into a script and I found this:

trap "rm -f $pidfile" 0 1 3 15

https://stackoverflow.com/questions/8122779/is-it-necessary-to-specify-traps-other-than-exit — William Pursell, Mar 07 '21 at 16:30

score 1 · Accepted Answer · answered Mar 07 '21 at 15:14

1

This installs a trap handler for exit (0) and signals 1 (SIGHUP), 3 (SIGQUIT) and 15 (SIGTERM) that removes a file presumably storing a process ID.

See man 3 signal for details about signals.

answered Mar 07 '21 at 15:14

Jens

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What does this mean in shell script: trap "rm -f $pidfile" 0 1 3 15

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