It's probably something very easy and stupid but I can't get back to the prompt in Lish.

I opened lish Ajax in Safari and started editing a file in nano. I was hoping to exit the file by doing cmd-x or something but I can't seem to find the combination.

Any thoughts?

You'll want to use ctrl+x to close nano. However Safari doesn't correctly pass control characters to the AJAX terminal, so you'll need to use a different browser, or Lish over SSH. Firefox seems to work the best with the AJAX terminal in terms of handling control characters and other funny cases. If you want to go the Lish over SSH route documentation on doing so can be found at:

http://library.linode.com/troubleshooti ... node-shell

Firefox did the trick