Check out the Unofficial Google Shell at Goosh.org. This google-interface behaves similar to a unix-shell. You type commands and the results are shown on this page. Goosh is written by Stefan Grothkopp. Goosh.org is a opensource project at Google Code.
You can use it as a unix shell executing commands to get results on the browser.
So if you like playing with commands you should go and try this out.