As said before, put this at the begining of your script (after the SheBang...

use <a href="http://search.cpan.org/search?mode=module&query=Getopt%3A
+%3ALong">Getopt::Long
</a>;
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And you'll manage all kinds of inputs.

You might have to read the perldoc...

>perldoc -m Getopt::Long
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It does magic at CLI like CGI does at a WWW server.

If you cannot get it, it's not you, it is that you might need some reading. Perl is quite easy once you know all the basic syntax.