#!/usr/bin/perl5.0
print "Content-Type: text/plain\n\n"; 

use strict; 

my %mod_list; 

listup($_) for grep {$_ ne '.'} @INC;
print "$_\n" for sort keys %mod_list; 

sub listup {
my ($base, $path) = @_;
(my $mod = $path) =~ s!/!::!g; 

opendir DIR, "$base/$path" or return;
my @node = grep {!/^\.\.?$/} readdir DIR;
closedir DIR; 

foreach (@node) {
if (/(.+)\.pm$/) { $mod_list{"$mod$1"} = 1 }
elsif (-d "$base/$path$_") { listup($base, "$path$_/") }
}
}