Let me give acknowledgment to Greg Lehey ahead of time for this as this bit that follows comes from _The Complete FreeBSD_.
".. by the mid-80s, there were four different versions of UNIX: the Research Version ... the Berkeley Software Distribution ... System V ... and XENIX, "
Sorry for omitting parts, but the overall idea of the passage remains intact.
I believe, and someone correct me here, that BSD was a modification of the /original/ UNIX code which existed prior to Sys V in 1983, indicating that BSD and Sys V are different branches from the same trunk. The history is rather confusing though, so I expect to be wrong on this.
-- Todd Stephens
You are right through the 80s. In the 90s, the System V code had to be pulled from most of the kernel. The NetBSD and FreeBSD projects started with the BSD 386 code, and had to redo their distro as a result of a lawsuit to the BSD 4.4 lite code. That code had several files removed as part of the lawsuit settlement. I'd guess that only SCO products, Solaris, AIX, and (if you believe SCO) Linux 2.4 has System V code in them now. Of course I mean solaris 2.x+, since 1.x was based on BSD code.
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"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."
- Albert Einstein (1879-1955)
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