Yet another way: If you just want the pid and psinfo for a script or program, then you could use Unix::Process by jettero

#!/usr/bin/perl

use Unix::Process;

my $vsz     = Unix::Process->vsz($$);
my $ppid    = Unix::Process->ppid;
my $pid     = Unix::Process->pid;
my $tty     = Unix::Process->tty;
my $stat    = Unix::Process->stat;
my $start   = Unix::Process->start;
my $rss     = Unix::Process->rss;
my $command = Unix::Process->command;

print "$vsz, $ppid, $pid, $tty, $stat, $start, $rss, $command\n";
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