You can read about the various command line switches in perlrun, the substitution should be explained in perlintro or perlretut.

The xx.pm is simply a command line argument to the script.

Perl 6 - links to (nearly) everything that is Perl 6.

In reply to Re: Explanation of Perl one-liner required by moritz
in thread Explanation of Perl one-liner required by Win

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