List Groups A User Belongs To In Unix

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Still seeing this request quite frequently in my website logs, I thought I'd expand the topic a bit more, given the fact that I've somehow left out the most obvious way to confirm the group membership for a Unix user.

Group membership in Unix

Every Unix-like OS is bound to have a group command, which is aimed to help you confirm Unix group membership for any user known to your system.

The easiest it to run it and specify a username in command line. The result is a list of Unix groups:

ubuntu$ groups greys
greys : admin www-data

If you're looking at confirming the membership for a few users, you can specify usernames in the same command line:

ubuntu$ groups greys root
greys : admin www-data
root : root

There you go – hopefully this satisfies your interest. Good luck with Unix experiments!

See also:

• Finding the primary Uinx group a user belongs to
• Find files belonging to a user or Unix group
• How to find who owns a file in Unix