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nah, still sticking to $1, since the first field is user name. There's no need to check the whole line.
If you look at the initial approach he's checking the first
field of the group file lines where the user is present on
the line, and print those.
If he just wanted the ONE unique group for a user he'd
be much better of to just do a lookup on the users gid,
and it would be pointless to make an effort to separate
the groups w/ commas, because there'd (on a normal
system, anyway) only be one group for each user.