Actually on Windows, the shebang line is not ignored. The Operating System ignores it, but Perl pays attention. Compare:

#!/usr/bin/perl
print undef;

[download]

with:

#!/usr/bin/perl -w
print undef;

[download]

The former issues no warning; the latter warns about using an uninitialized value.

This is because in Perl, the shebang line performs two roles. It's used by Unix-like operating systems as a "dispatch mechanism" - to decide which program should interpret the script. And on all operating systems Perl parses it looking for command-line options. It doesn't honour all command line options found there (e.g. -M) but does some (like -w and -t).

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

In reply to Re^2: Issue with #!usr/bin/perl by tobyink
in thread Issue with #!usr/bin/perl by Anonymous Monk

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