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#!/usr/bin/perl -w
use strict;
use ExtUtils::Installed;
...
        ? map $inst->files($_), @ARGV
        : $inst->modules();
__END__

$ perl -MExtUtils::Installed -le'print $ExtUtils::Installed::VERSION, 
+" ", $ExtUtils::Packlist::VERSION, $/'
0.02 0.03

...
    /usr/lib/perl5/site_perl
    /usr/lib/perl5/site_perl
    .