Find the PID of current program

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

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Re: Find the PID of current program by madbombX (Hermit) on Nov 28, 2006 at 12:37 UTC
This is the section right out of the Perl documentation for `$$`. You can find it in perlvar. $PROCESS_ID $PID $$ The process number of the Perl running this script. Yo +u should consider this variable read-only, although it will be a +ltered across fork() calls. (Mnemonic: same as shells.) Note for Linux users: on Linux, the C functions "getpid +()" and "getppid()" return different values from different thre +ads. In order to be portable, this behavior is not reflected by + $$, whose value remains consistent across threads. If you w +ant to call the underlying "getpid()", you may use the CPAN mo +dule "Linux::Pid". [download]	[reply] [d/l] [select]
Re: Find the PID of current program by Callum (Chaplain) on Nov 28, 2006 at 12:09 UTC
$$	[reply]
Re: Find the PID of current program by Fengor (Pilgrim) on Nov 28, 2006 at 12:48 UTC
for a list of perl variables i'll recommend this excellent node: Perl Special Variables Quick Reference -- "WHAT CAN THE HARVEST HOPE FOR IF NOT THE CARE OF THE REAPER MAN" -- Terry Pratchett, "Reaper Man"	[reply]
Re: Find the PID of current program by smokemachine (Hermit) on Nov 28, 2006 at 12:09 UTC
`$$`	[reply] [d/l]
Re: Find the PID of current program by andyford (Curate) on Nov 28, 2006 at 15:48 UTC
Note, however, that the PIDs will eventually wrap at some point, i.e. there is a maximum. Something like 32_000, depending on your system. If this is a potential problem, you might want something more sophisticated. You could also review previous perlmonks discussions. non-Perl: Andy Ford	[reply]
Re: Find the PID of current program by andreas1234567 (Vicar) on Nov 30, 2006 at 06:44 UTC
Have a look at Log::Log4perl. It provides the PID functionality you want, besides being a powerful log framework: Read more... (2 kB) Writes both to screen (STDOUT) and a file named pid.pid.log that is rotated on 50K: Read more... (544 Bytes) Andreas --	[reply] [d/l] [select]