How Unix-like is MacOS X?

prospective_user asks: "I am a heavy user of Unix, spend most of my time running Linux and am considering getting myself an iBook, after seeing a considerable amount of exposure Macs/Apple have in both Slashdot and the O'Reilly Network. Given that MacOS X is based on FreeBSD/Mach, I suppose that the usual Unix libraries and environments (like ncurses and tcl/tk) are available in MacOS X (which I hope is true, for text-based applications). In fact, I'm concerned about the Unix side of MacOS X and also plan on running Debian/PPC on it, but I plan to primarily use MacOS X. So, before having an (uncertain) investment in a new platform, it would be reasonable to have a bit more of background on it and thus, the questions: how well does MacOS X support traditional Unix applications? For instance, how do the following applications run under MacOS X (which I use the most): teTeX, GNU Emacs, mutt and fetchmail?" Note that the submittor isn't asking if OSX is or is not a Unix; we've fielded that question already. No, the question here is where does OSX differ from the other unicies.

"Also regarding the investment in a new platform and coming from the x86 world, I'm a bit interested about the PowerPC performance in comparison to what I could get with a x86 notebook. I've read some articles and pages that suggest that PowerPCs may not be fast (or, in fact, may be quite slower than their x86 counterparts):

Some of the sources I've read are: these pages, from D. J. Bernsteins's website, and this article on processor performance from the GMP website.

Also, as some later questions, can the portable Macs be plugged to non-mac monitors? And does MacOS X feature a packet filter like Linux or other BSDs do?

Any comments and experiences with these machines are welcome. Thanks."

Comments

Considerations

[HRbnjR]

Well, as a longtime Linux user, I can say that if you are looking at more proprietary commercial offerings such as Mac OS X, you should seriously give some consideration to Microsoft Windows XP combined with Cygwin. The combination serves me well for work.