Interestingly, you can see it log every unrecognized command via a GET request to /unixkcd/missing (look at source/firebug). It appears that he's been updating

Interestingly, you can see it log every unrecognized command via a GET request to /unixkcd/missing (look at source/firebug). It appears that he's been updating the source code with things that people commonly try ('rm' didn't used to be supported); I also look forward to a "what you crazy people on my site tried" comic.