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> Since there's a possibility of the regex failing with grep
> (uppercase/lowercase, other fields from the passwd file containing
If you grep for ^${var}:, you eliminate the possiblity of the regex
matching against another field in the passwd file. You can also feed
grep the -i flag to instruct it to ignore case.
> the same pattern -- what about NIS, shadow password files, etc...),
> is it an option to just use another utility?
You're right, this technique won't work for systems that use yp.
-mct