The first char is what is returned when met (single char option char).
The second is zero ore more long option values (synonum for single char)
If colon is appended, it means the option takes an argument.
The first char is what is returned when met (single char option char).
The second is zero ore more long option values (synonum for single char)
If colon is appended, it means the option takes an argument.