Have you looked at the documentation? It's the first type of option in there ("Simple options"). 
GetOptions(
   'help' => \$help,
);

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"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: handling switches with no argument using GetOpt::Long by Joost
in thread handling switches with no argument using GetOpt::Long by bahadur

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