Linux is not Unix: it is not derived from AT&T Unix.
replyBy that definition, nor is BSD. It's kind of their whole raison d'étre.
replyLinux 2.2 or 2.4 or so (possibly only Suse Linux) even had a kernel startup message "Unix compliance testing by UNIFIX" or something, back when Unix was considered more prestigious than Linux. It is / was by some official definition "a Unix", though not "UNIX the trademark by AT&T".
replyI’m fairly certain they’re referring to POSIX compatibility, not calling a Linux a Unix.
replyOh damn, you are probably right.
replyWhat are the differences? I think of both as Unix-type sytems with macrokernels. I have no practical experience with BSDs.
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