Check the documentation:

The run method returns the pid of the detached process; alternatively you can specify a file for it to write the pid to: 

# Start  scheduler, detach  from current  process and
# write  the  PID  of  the forked  scheduler  to  the
# specified file
$cron->run(detach=>1,pid_file=>"/var/run/scheduler.pid");

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In reply to Re: problem with Schedule::Cron by muntfish
in thread problem with Schedule::Cron by riddimak

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