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
Difficulty	Easy (rss)
Root privileges	No
Requirements	None
Time	1m

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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:

See also

• Linux / Unix: groups Command Examples
• Linux / Unix: id Command Examples
• Man pages – id(1)

Category	List of Unix and Linux commands
File Management	cat
Firewall	Alpine Awall • CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04
Network Utilities	dig • host • ip • nmap
OpenVPN	CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04
Package Manager	apk • apt
Processes Management	bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time
Searching	grep • whereis • which
User Information	groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w
WireGuard VPN	CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04