User Modification Commands in Linux

The usermod command modifies the system account files to reflect the changes that are specified on the command line.

User Modification Commands :

#usermod -c <Add comment>              - To change the comment for user.

#usermod -d <Home directory>           - To change the user home directory.

#usermod -u <UID>                               - To change the user id.

#usermod -g <Initial group>                  - To change initial group.

#usermod -G <Supplementary group> - To add sub group.

#usermod -l <Login name >                 - To change the login name.

#usermod -s <shell>                             - To change the shell.

#usermod -L <User name>                  - To lock the user account.

#usermod -U <User name>                 - To unlock the user account.

SYNTAX

To Add the Comment Entry

root@linuxstorages:~#usermod -c <Comment> <User name>

 To change the home directory

root@linuxstorages:~#usermod -d <Home Directory> <User name>

To change the user ID

root@linuxstorages:~#usermod -u <New UID> <User name>

To change the group ID

root@linuxstorages:~#usermod -g <Existing GID> <User name>

To add users to a supplementary group

root@linuxstorages:~#usermod -G ls2  ls3  [Adding user ls3 to group ls2]

root@linuxstorages:~#usermod -G ls2  ls1  [Adding user ls1 to group ls2]

To change the user's login name

root@linuxstorages:~#usermod -l <New Login name> <User name>

To change a user's shell

root@linuxstorages:~#usermod -S /sbin/nologin <User name>

Alternate way of changing a shell is by giving command in prompt as chsh

root@linuxstorages:~#chsh <User name>

To lock user's password

root@linuxstorages:~#usermod -L <User name>

To unlock a user's password

root@linuxstorages:~#usermod -U <User name>

To delete a user [This will not remove the user's home directory]

root@linuxstorages:~#userdel <User name>

To delete a user including home directory

root@linuxstorages:~#userdel -r <User name>

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Written by Unknown