Yeah, I remember that one. Gotta love the mousover too!
They've done a *bunch* of Linux-related strips. A few of the better ones:http://xkcd.com/149/http://xkcd.com/456/http://xkcd.com/644/
...and the mother of all XKCD Linux/UNIX humor, from April 1 last year (but has apparently been maintained ever since):http://uni.xkcd.com/
The "uni" sub-domain is a fully-functional CLI to the XKCD site... complete with some rather amusing (and sometimes self-referential) Easter eggs. Try typing some of the dialogue from #149 (first one I linked above). Or try the wget
command, giving the complete URL for any web site (with leading "http://") as the argument... and yes, using wget to recursively reload the uni.xkcd.com site works too. Many other Linux CLI commands do interesting things too... and even a few commands from "old school" text-based adventure games. This is some brilliantly funny/geeky/sick stuff!