Linux 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".
Linux is not Unix: it is not derived from AT&T Unix.
By that definition, nor is BSD. It's kind of their whole raison d'étre.
Linux 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".
I’m fairly certain they’re referring to POSIX compatibility, not calling a Linux a Unix.
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What are the differences? I think of both as Unix-type sytems with macrokernels. I have no practical experience with BSDs.