Way out of date now - don't bother.
This book lives up to its title. I would have wished it were a bit more than it is, but I can't complain too much: it is a quick introduction to Mac OS X for those of us already comfortable in the Unix world.
Half the book covers major conceptual differences (directory services vs. traditional /etc/passwd, Aqua vs. X11 etc.) and the other half covers compiling, both source and the kernel. A final chapter explains how to run X11 under Aqua.
There's a good appendix that lists and briefly explains some of the more important files and directories, and another that gives more details on a few command line tools.
This is worth picking up if you are going to investigate Mac OS X.
Order (or just read more about) Mac OS X for Unix Geeks from Amazon.com
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More Articles by Tony Lawrence © 2011-04-30 Tony Lawrence
Anyone who puts a small gloss on a fundamental technology, calls it proprietary, and then tries to keep others from building on it, is a thief. (Tim O'Reilly)