Stefan Grothkopp made a browser-based Google shell by Ajax, named Goosh. This google-interface behaves similar to a Unix-shell, through which you can use all kinds of search services provided by Google, such as web, image, blog, map, video, wiki, etc. "You type commands and the results are shown on this page." This is the brief introduction by the author.
If you’re not familiar with commands, type "help" and all you need is there.
Try it if you’re a fan of command-line interpreter, and also notice that this is not an official Google product.
Here’s a snapshot: