Re: [PLUG] How to find parent in the shell?

[mjd-lists-plug@plover.com (Mark Dominus)]

Michael C. Toren:
> I don't see how testing to see if your parent process is init will give
> you any insight into weather or not your script is being executed at boot
> time or not, unfortunately.  What if a user types "exec
> /etc/init.d/whatever" from a console login shell?

Moreover, when the parent process of process P exits, process P is
adopted by init.  So

        sh -c '  perl -le "sleep 2; print getppid()"  &  '

prints '1', because this command runs a shell, which runs Perl in the
background and exits; two seconds later Perl uses getppid() to find
its parent process ID, and discovers that its parent is init.

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