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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
RRP £29.95 ($39.95)

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The process number of the Perl running this script. You should consider this variable read-only, although it will be altered across fork() calls. (Mnemonic: same as shells.)

Note for Linux users: on Linux, the C functions getpid() and getppid() return different values from different threads. In order to be portable, this behavior is not reflected by $$, whose value remains consistent across threads. If you want to call the underlying getpid(), you may use the CPAN module Linux::Pid.

ISBN 9781906966027Perl Language Reference ManualSee the print edition