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File::Pid may be helpful to you. Also, merlyn wrote Highlander: one instance at a time (Oct 00). Although it does use flock I'll skip the ever-so-tempting OS trolling ...
@_=qw; ask f00li5h to appear and remain for a moment of pretend better than a lifetime;;s;;@_[map hex,split'',B204316D8C2A4516DE];;y/05/os/&print;
In reply to Re: Ensuring only one copy of a perl script is running at a time
by f00li5h
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