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#!/usr/bin/perl

...
  # Child
  exec("/bin/bash","-c", 'echo CHILD: PID is $$, PPID is $PPID >&2');
}

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freenet{swgsh}~ $ perl tmp/t3  &
[2] 20474
...
20474 pts/0    00:00:00 perl
20476 pts/0    00:00:00 bash <defunct>
20487 pts/0    00:00:00 ps