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/Perl 5.20

getpgrp

getpgrp PID

Returns the current process group for the specified PID. Use a PID of 0 to get the current process group for the current process. Will raise an exception if used on a machine that doesn't implement getpgrp(2). If PID is omitted, returns the process group of the current process. Note that the POSIX version of getpgrp does not accept a PID argument, so only PID==0 is truly portable.

Portability issues: getpgrp in perlport.

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http://perldoc.perl.org/5.20.2/functions/getpgrp.html