It's neither ignored on the command line (perl -w script.pl) nor on the shebang line (#!/usr/bin/perl -w). While Windows doesn't know anything about the shebang line, Perl checks for a shebang line, and treats everything after perl as options.

In reply to Re^3: Changing the Value Assigned To A Hash Key by ikegami
in thread Changing the Value Assigned To A Hash Key by Anonymous Monk

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