Ubuntu Linux: Find Groups A User Belongs To

How do I find out in which groups Ubuntu Linux users belong to? How do I find out Ubuntu Linux group membership for a particular user named tom?

You can use any one of the following command to list a groups a user belongs to:
Tutorial details
DifficultyEasy (rss)
Root privilegesNo
RequirementsNone
Time1m

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a) id command – Display real and effective user and group IDs.

b) groups command – Display the groups a user is in on Ubuntu Linux.

Ubuntu: See which groups your Linux user belongs to

Open the Terminal app or login to the remote server over the ssh based session. Type the following id command $ id -Gn

To display the groups a user named ‘tom’ is in on Ubuntu Linux, enter:
$ id -Gn tom

You can also use deprecated groups command as follows:
$ groups
$ groups tom

Sample outputs:

Fig. 01: groups and id command on Ubuntu

Fig. 01: groups and id command on Ubuntu

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