#!/usr/bin/perl
use strict;
use warnings;
package Touchable;
exit 0 unless (stat ($0))[9] && (($^T - (stat ($0))[9] ) < 3);


##</code><code>##


# consuming script: yourprogram.pl
use strict;
use warnings;
use Touchable;

print "here $0\n";

# usage example
perl yourprogram.pl 

# works only if touch activated..
touch yourprogram.pl & perl yourprogram.pl

here yourprogram.pl