As tye said, you can
use #!perl -w
on Windows. In fact, you can use the #! line on any platform to specify options. perlrun
The #! line is always examined for switches as the line is
being parsed. Thus, if you're on a machine that allows
only one argument with the #! line, or worse, doesn't even
recognize the #! line, you still can get consistent switch
behavior regardless of how Perl was invoked, even if -x
was used to find the beginning of the script.
perl itself parses the #! line, even if the operating system ignores it. There are a few other tricks perl does with the #! line, also described in perlrun
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