as for those commands, yes they are scary at first, but once you master them, they serve you well. and even under OSX can speed some things up like moving mass amounts of files and searching raw text and stuff. and X11 is client/server based, so it is scary at first, but once you master that, it become a indespensible tool. just read a few books on unix, and learn to have fun tinkering with shit, go get a cheap x86 system and install each of the *bsd's for a month at a time learning how each on works, do the same with debian, slackware, and redhat. preferably starting with the linux's first to get the basic and intermediate unix skills up to speed. after that you will know alot of unix stuff, and have a way better understanding of how things work, learning is pretty fun. or atleast it should be. never be afriad to tinker with something unless you have a damned good reason not to/*eg, 50gig partition almost filled with media is a pretty compelling reason for me to be careful*/ and backup important things, so when you poke the system into the twilight zone, your work and effort doesn't follow it. as i said, always try to learn more about computers and other stuff, and you will be happy