=over =item setpgrp PID,PGRP X X Sets the current process group for the specified PID, C<0> for the current process. Will produce a fatal error if used on a machine that doesn't implement POSIX setpgid(2) or BSD setpgrp(2). If the arguments are omitted, it defaults to C<0,0>. Note that the BSD 4.2 version of C does not accept any arguments, so only C is portable. See also C. =back