I've got a Perl program that is run once an hour as a cron job.
Normally it finishes its task in about ten minutes, but occasionally
it takes more than an hour to complete.  When this happens, a second
copy is started, the two copies step on each others' toes, and both
crash.

I'm looking for the second copy to know that another copy is running
and exit after logging a message to that effect.  Any method needs to
work properly if the first copy crashes rather than exiting cleanly.

Thanks,
Mark Wagner

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