Isn't Mach technically a copy of UNIX as well, or rather re-implementation. I'm sure most of you know that Mach is the kernel developed by CMU as the replacement for the BSD kernel. Only OS X and Tru64 UNIX use it. Honestly, I don't see a point to the differentiation between BSD, Solaris, Linux and others. They're all Unix, not UNIX, but Unix. Yes, there is a glaring difference between Linux distribution development ideology and BSD, Solaris, and other's development ideologies. They're polar opposites. While one employs tight control with a focus on F/OSS, most Linux distributions with the exception of Debian and Slackware and possibly others, are fairly loose. However, they all function quite similarly and are generally cross-compatible.
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"UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity."
MacBook Pro (Darwin 9), iMac (Darwin 9), iPod Touch (Darwin 9), Dell Optiplex GX620 (FreeBSD 7.1-STABLE)
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