How do I switch back from user to root?

To get root access, you can use one of a variety of methods:

1. Run sudo <command> and type in your login password, if prompted, to run only that instance of the command as root. …
2. Run sudo -i . …
3. Use the su (substitute user) command to get a root shell. …
4. Run sudo -s .

How do I switch users in Linux?

To change to a different user and create a session as if the other user had logged in from a command prompt, type “su -” followed by a space and the target user’s username. Type the target user’s password when prompted.