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In Linux, how do I get a list of all the groups a particular user is a member of?

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migrated from stackoverflow.com Jun 20 '11 at 11:58

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4 Answers 4

up vote 7 down vote accepted

If you are the user:

groups

If he is someone else:

groups hisname
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Use the groups command, i.e.

groups username
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The id command will list group memberships by both name and id number.

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You could simply pilfer through the /etc/group file. It has a simple format: groupname: username, username2, username3, with one group per line.

Or, grep through it.

grep '[:,]username' /etc/group
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