$$ Question

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

I cam across this line.

$uniqueid = sprintf("%05d%04d", $$, $curid);
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What does $$ here signify, Is it a process id? As when tested i was getting a random 4 digit number every time for $$.

Advance thanks for help!!!

Edit: g0n - code tags

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Re: $$ Question by ikegami (Patriarch) on Nov 15, 2007 at 06:15 UTC
Yes, `$$` is the process number. In Windows, it can also be a negative number. That indicates the current process is really a thread created using the `fork` emulation.	[reply] [d/l] [select]
Re^2: $$ Question by vsailas (Beadle) on Nov 15, 2007 at 06:33 UTC
Thank you!	[reply]
Re: $$ Question by tilly (Archbishop) on Nov 15, 2007 at 06:04 UTC
As perlvar says, $$ is indeed your process ID.	[reply]