"I don't have a windows, I have a mac. Does that matter?"

I have a Mac. I start all my scripts like this:

#!/usr/bin/env perl
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When you start using "Command Switches", you can add them after that. For example, here's one I commonly use:

#!/usr/bin/env perl -l
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Perl is pretty cross platform. The #! line is a *nix thing which may be important on a Mac as Macs these days are really *nix boxes in any case. I didn't mention Mac because Windows and *nix are by far the most common platforms for people discussing Perl and Mac is kinda a special case of *nix anyway.

For the most part, Mac (today) is unix-ish. Unix at its core with Apple 'tweaks'.