Add a user to a group on Linux
Add a user to a group by using the usermod command.
Add a user to a group on Linux
Add a user to a group by using the usermod command.
Procedure
To add a member to a supplementary group, execute the usermod command and list the supplementary groups that the user is currently a member of, and the supplementary groups that the user is to become a member of. For example, if the user is a member of the group groupa, and is to become a member of groupb also, the following command is used: usermod -G groupa,groupb user-name , where user-name is the user name.