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    Nice article. Two nitpicks.

    PERL is usually called Perl.

    Please teach people to use #!/usr/bin/env perl (or python, bash and others that are not /bin/sh, which is supposed to be a POSIX shell), because it might be located elsewhere.

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      use strict and use warnings

      Long live Perl!!

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        use diagnostics is also nice to have, especially when starting out.