Linux: Find Out The Groups A User Is In

To find out the groups that a user is in on a Linux system, you can use the id command.

For example, to find out the groups that the user user1 is in, you can run the following command:

id -Gn user1

This will list the names of the groups that the user is a member of, separated by spaces.

Alternatively, you can use the groups command to list the groups that a user is in. For example:

groups user1

This will also list the names of the groups that the user is a member of, separated by spaces.

You can also use the id command to display detailed information about a user, including their user ID, group ID, and the groups that they are a member of. For example:

id user1

This will display output similar to the following:

uid=1000(user1) gid=1000(user1) groups=1000(user1),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),108(lxd)

This shows the user ID (uid), group ID (gid), and the list of groups that the user is a member of (groups).