The groups command is a command-line tool in Linux and UNIX-like operating systems that is used to display the group membership of a user. The groups command takes one or more username arguments, and it displays a list of the groups that each user is a member of.

Here are a few examples of how to use the groups command:

1. Display the groups for the current user:

groups

2. Display the groups for a specific user:

groups username

3. Display the groups for multiple users

groups user1 user2 user3

4. Display the groups and its id number(GID)

groups -n

In Linux and UNIX-like operating systems, every user is assigned to a primary group, which is usually the user’s username and they can also be assigned to other groups as secondary groups.

Additionally, The id command is similar to the groups command and it provides additional information about the user such as UID, GID, and supplementary groups.

id username

This command will provide output like this

uid=1000(username) gid=1000(username) groups=1000(username),4(adm),24(cdrom),...

It shows that the user belongs to group username, as primary group, and belongs to other groups such as adm and cdrom as supplementary groups.

Other Linux Commands

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76. groups Command
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230. Linux Commands and Examples