in reply to get name of process with pid

(untested)

use Proc::ProcessTable;

my $procs = Proc::ProcessTable->new;

foreach ($procs->table) {
  if ($_->pid = $required_pid) {
    print $_->cmndline;
    last;
  }
}

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<http://dave.org.uk>

"The first rule of Perl club is you do not talk about Perl club."
-- Chip Salzenberg

In Section Seekers of Perl Wisdom