Ubuntu User: A command to list all users? And how to add, delete, modify users?

A command to list all users? And how to add, delete, modify users?



To list all users you can use:

$ cut -d: -f1 /etc/passwd

To add a new user you can use:

$ sudo adduser new_username

or:

$ sudo useradd new_username

See also: What is the difference between adduser and useradd?
To remove/delete a user, first you can use: (2 commands for username and directory)

$ sudo userdel username

Then you may want to delete the home directory for the deleted user account :

$ sudo rm -r /home/username

^{(Please use with caution the above command!)}
To modify the username of a user:

$ usermod -l new_username old_username

To change the password for a user:

$ sudo passwd username

To change the shell for a user:

$ sudo chsh username

To change the details for a user (for example real name):

$ sudo chfn username

And, of course, see also: man adduser, man useradd, man userdel... and so on.