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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.