Linux vs. Unix: What's the difference? | Opensource.com
Around this time AT&T and Sun released System V Release 4 (SVR4), which was adopted by many commercial vendors. Separately, the BSD family of operating systems had grown over the years, leading to some open source variations that were released under the now-familiar BSD license.This included FreeBSD, OpenBSD, and NetBSD, each with a slightly different target market in the Unix server industry.
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