3.4.5. Deleting Users

If you want to remove a user account from the system, use the userdel command on the command line as root.
userdel username
Combining userdel with the -r option removes files in the user's home directory along with the home directory itself and the user's mail spool. Files located in other file systems have to be searched for and deleted manually.
userdel -r username


The -r option is relatively safer, and thus recommended, compared to -f which forces the removal of the user account even if the user is still logged in.