I won't convert, but I like this challenge and it can help me out a little in the Mac arena.
OS X is based off the
BSD (Berkeley Software Distribution) flavor of Unix.
I am mostly in the Windows environment these days, so this also helps dust off the cobwebs with my real passion - Linux and Unix.
A lot of the commands are the same.
Edit: I've worked with SCO Unix, FreeBSD, Open BSD, Redhat/Fedora Linux, Slackware Linux (my favorite), Ubuntu and e-smith Linux (The worst).