> American English uses "color", British English uses "colour" -
> having both lets you spell it the way that is right for you.
I see. Although I am not going to discriminate against British
English users, just '--color' is enough, I think. If we have both
then we should also have GREP_COLOUR and GREP_COLOURS.
Since getopt() accepts the minimum portion of the option name
which can be distinguished, the difference is not known if you type
like this. :)
$ global --col ...