Linux is by default a multi-user system, thus user management is one of the fundamental tasks of a system administrator. User management includes everything from creating, updating, and deleting user accounts or user groups on a Linux system.

 

Check a User Group in Linux

 

Check a user group, by running the following groups command:

# groups rootadminz

rootadminz : rootadminz superior

 

To check your own groups, just run the groups command without any argument.

# group

root

 

Add a User to a Group in Linux

 

Before adding a user to a group, ensure that the user exists on the system. To add a user to a certain group, use the usermod command with the -a flag, and the -G option specifies the actual groups in the following format.

 

In this example, rootadminz is the username and postgres is the group name:

# usermod -aG postgres rootadminz
# groups rootadminz

 

Remove a User from a Group in Linux

 

To remove a user from a group, use the gpasswd command with the -d option as follows.

# gpasswd -d rootadminz postgres
# groups rootadminz

 

Additionally, on Ubuntu and it’s derivative, you can remove a user from a specific group using the deluser command as follows (where rootadminz is the username and postgres is the group name).

$ sudo deluser rootadminz postgres

 

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