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MacOS is a certified Unix. See [1] [2].

[1] https://www.opengroup.org/openbrand/register/brand3673.htm

[2] https://www.opengroup.org/openbrand/register/brand3678.htm

Interesting. I wasn't aware that Unix is a standard - I thought it was a codebase. Thanks!

FreeBSD is literally based directly off of AT&T Unix versions 5, 6, and 7 (in varying capacities).

AT&T Unix -> BSD -> FreeBSD -> NeXTSTEP -> macOS. (This is overly simplified, as everything is a mess and macOS contains code from both FreeBSD and original BSD which FreeBSD was based on, among other places.)

macOS is ironically a more authentic Unix than Linux is, Linux having been a clone while macOS being a great grandchild.

Diagram of Unix History: https://upload.wikimedia.org/wikipedia/commons/7/77/Unix_his...

Linux is not Unix and it is not developed to be one.

Not to be that guy, but isn't BSD and it's derivatives still Unix derived so parent's comment still holds? (Though to the parent comment I'd argue that OSX isn't really a sold OS either because I can't buy just it)

It is, but my (inartfully phrased) question would still count it.

what I meant, though, was "for the datacenter" or "for server applications."