Typing 'Alt-F2' will give you a login prompt. You can log in with username 'root' and your admin password. When you're finished doing your command line thing, type either 'exit' or 'logout' and hit 'Alt-F1' to go back to the admin console. SME has one more 'virtual console' located under the 'Alt-F3' key, in case you need to work in more than two consoles.