http://wiki.dwscoalition.org/wiki/index.php/Dev_Maintenance#dwu_-_Updating_the_repos now has an example for Git, so it might be worth adding that as a "gitupdate" command or something like that? I'm going to test some of it out in a bit, so can come back with edits.

Also, it might be worth adding idiot-proof instructions at the top, explaining that you have to copy the stuff in the box into a new file called ~/bin/doeverything and give it the right permissions and so on.