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#!/usr/bin/perl

...
} else {
    die "couldn't fork";
}

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$ ./698259.pl
  PID  PPID  PGRP   SID CMD
...
 2963  2960  2963  2963 bash
 4074  2963  4074  2963  \_ /usr/bin/perl ./698259.pl
 4079  4074  4074  2963      \_ ps f -s 2963 -o pid,ppid,pgrp,sid,cmd