When I go into virtual terminal 3 Ctrl+Alt+F3 and log in as root, then I get a message that says root has new mail. How do I check it. Also, I think what the mail is is a log of the sudo use. When I am logged in as a regular user and then try to use sudo, it says I'm not in the sudoers file and its reporting me. How do I make it so that I can use sudo on a hardrive install?

Also What is the command to delete a directory ever if there is something in it?