I need a command to list all users in terminal. And how to add, delete, modify users from terminal. Solution: To list all local users you can use: cut -d: -f1 /etc/passwd To list all users capable of authenticating (in some way), including non-local, see this reply: https://askubuntu.com/a/414561/571941 Some more useful user-management commands (also limited to local users): 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: 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 usern