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3.4.4. Modifying User Settings
When a user already exists and you need to specify any of the options now, use the
usermodcommand. The logic of using
usermodis identical to
useraddas well as its syntax:
usermod option(s) username
If you need to change the user's user name, use the
-loption with the new user name (or login).
Example 3.10. Changing User's Login
~]# usermod -l "emily-smith" emily
-loption changes the name of the user from the login
emilyto the new login,
emily-smith. Nothing else is changed. In particular,
emily's home directory name (
/home/emily) remains the same unless it is changed manually to reflect the new user name.
In a similar way you can change the user's UID or user's home directory. See the example below:
Find all files owned by the specified UID in system and change their owner. Do the same for Access Control List (ACL) referring to the UID. It is recommended to check there are no running processes as they keep running with the old UID.
Example 3.11. Changing User's UID and Home Directory
~]# usermod -a -u 699 -d /home/dir_2 robert
The command with
-doptions changes the settings of user
robert. Now, his ID is 699 instead of 501, and his home directory is no longer
usermodcommand you can also move the content of the user's home directory to a new location, or lock the account by locking its password.
Example 3.12. Changing User's
~]# usermod -m -d /home/jane -L jane
In this sample command, the
-doptions used together move the content of
jane's home directory to the
-Loption locks the access to
jane's account by locking its password.
For the whole list of options to be used with the
usermodcommand, see the
usermod(8) man page or run
usermod --helpon the command line.