BSD is what you get when a bunch of Unix hackers sit down to try to port a Unix system to the PC. Linux is what you get when a bunch of PC hackers sit down and try to write a Unix system for the PC.Now, I like that quip, not because it's some sort of absolute revealed truth, but because it gives a very good feel for some of the differences. The BSDs, in general, are very much more like traditional Unices than Linux is. A lot of that is because they're direct-line descendants of the BSD from Berkeley, which was a direct-line descendant of the original AT&T Unix. Unix-the-trademark is a trademark of The Open Group, and Unix-the-code is owned by SCO, so one can't actually say that the BSDs are really Unix (that's the sort of statement that triggered the USL/UCB lawsuit extravaganza, in fact). But, in many ways, the BSDs are direct derivatives of traditional Unix.
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