in reply to Inconsistent behavior of Getopt::Std
Getopt::Std is using the conventions traditionally used by Unix commands. For someone who's been using Unix/Linux for a long time, it's consistent with with the other(non-GNU) command's option parsing, with all of it's warts.
Getopt::Long follows the newer GNU conventions and may be closer to what you're expecting.
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Seekers of Perl Wisdom