All switches are optional. (On that subject, the docs say "That's why they're called 'options'.") If you don't want a switch to be optional, you have to explicitely check to make sure a value was supplied, after calling GetOptions.

In reply to Re^4: how to make -h optional in GetOpt::Long by ikegami
in thread how to make -h optional in GetOpt::Long by bahadur

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