Check out Proc::PID_File. 

use Proc::PID_File;
die "Already running!\n" if
       hold_pid_file("/var/run/myproc.pid");

&do_something;

exit; # pid file will be automatically removed here

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In reply to Re: Writing to flock files in a daemon by zengargoyle
in thread Writing to flock files in a daemon by graq

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