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  1. or download this
    $ ps -p xxxx

...

   PID TTY      TIME CMD
  9556 pts/49   0:00 bash
  2. or download this
    my $parent = (grep {/^\s*\d+/} (`ps -p $parent_id`))[0];
  3. or download this
    my $parent = " ".(grep {/^\s*\d+/} (`ps -p $parent_id`))[0];