Nobody's mentioned $0 yet, so I will, because that actually does what you're asking for in your question (i.e. give you the name of the script which is running when your module is loaded). However, judging from the purpose you describe, you'll be better off with diotalevi's suggestion, to use caller() to determine what has loaded your module, because that will return the file your module was loaded from. For example if you have, in Flim.pm

package Flim;

sub new {
  print "Caller: ".join("-",caller())."\n";
  print '$0: '.$0."\n";
}
[download]

in Flam.pm:

package Flam;
use Flim;

sub new {
  Flim->new();
}
[download]

and in flimflam.pl:

use Flam;

Flam->new();
[download]

This will print out

Caller: Flam-/Flam.pm-3
$0: flimflam.pl
[download]