I am a new Linux and Unix system user. How do I list the user’s groups or group’s users on Linux operating systems? How can I show list of users belonging to a given group on Linux based server?

You need to use the lid (list ID) command to show information about groups containing user name, or users contained in group name at a shell prompt. This command is just like groups command which

list a user’s group memberships or members command which outputs members of a group on Linux operating system. This command may not be available on other Unix-like operating systems.

Purpose

Displays the group that a given user belongs to on Linux operating systems.

Syntax

The basic syntax is as follows:

lid userNameHere

OR

lid [options] userNameHere

This command must be run with superuser privileges other wise you will get an error that read as follows:

No user name specified, using nixcraft.
Error initializing libuser: not executing with superuser privileges.

Warning: On Debian and Ubuntu Linux based system you need to use the apt-get command to install lid command
sudo apt-get install libuser

lid command examples

If you skip user name on command line, lid lists information about the invoking user (also know as the current user). Just type the following command:
$ sudo lid
OR
# lid
Sample outputs:

By default lid displays groups containing the invoking user if user-name is not specified on command line.

How do I list users in a group name?

To Show users in a group, enter:
# lid -g {groupNameHere}
To see users of members of ‘webmaster’ group, enter:
# lid -g webmaster
Sample outputs:

 webadmin(uid=1014)
 raj(uid=1001)
 vivek(uid=1002)
 archana(uid=1003)
 sai(uid=1004)
 sayali(uid=1005)

How do I hide GID/UID?

By default the user IDs (UID) or group IDs (GID) are displayed by lid command. To hide UID/GID pass the -n option:
# lid -n {name}
# lid -n nixcraft
# lid -n -g webmaster
Sample outputs:

 webadmin
 raj
 vivek
 archana
 sai
 sayali

lid command options

From the lid(1) command man page:

Options	Description
-i --interactive	Prompt for all information.
-g --group	List members of a named group instead of the group memberships for the named user.
-n --onlynames	Only list membership information by name, and not UID/GID.
-? --help	Show this help message on screen.
--usage	Display brief usage message.

See also

• /etc/group file.
• lid(1)

Category List of Unix and Linux commands File Management cat Network Utilities dig • host • ip Package Manager apk • apt Processes Management bg • chroot • disown • fg • jobs • kill • killall • pwdx • time • pidof • pstree Searching whereis • which User Information groups • id • last • lastcomm • logname • users • w • who • whoami • lid • members