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usermod

The `usermod` command line tool can be used to modify properties, permissions, and group membership of existing users.

Username

Add user to additional groups beyond their existing groups (-a)

Create a new basic directory in the user's home directory (-b)

User's comment (-c)

User's home directory (-d)

Expiration date for the user account (-e)

Ignore values in the /etc/default/useradd file (-f)

User's initial login group (-g)

User's additional group list (-G)

Display help text (-h)

New username (-l)

Lock the user's password (-L)

Create a new basic directory in the user's home directory (-m)

Allow the use of non-unique user IDs (-o)

User's encrypted password (-p)

User's shell (-s)

User ID (-u)

Unlock the user's password (-U)

Set SELinux User Mapping for the user (-Z)

Example

Add user jdoe to group sales: sudo usermod -a -G sales jdoe
Change the home directory of user jdoe to /home/jdoe-new: sudo usermod -d /home/jdoe-new jdoe
Change the comment information for user jdoe to "John Doe, Engineering": sudo usermod -c "John Doe, Engineering" jdoe
Change the default shell for user jdoe to zsh: sudo usermod -s /bin/zsh jdoe
Change the UID for user jdoe to 1001: sudo usermod -u 1001 jdoe