So, Is macOS UNIX?
The answer has to be yes.

You can trace its lineage back through FreeBSD to BSD, and from there, back to the Unix distributed by Bell Labs before the license fee increase from AT&T.

But that doesn’t matter.

If you write an operating system from scratch right now, as long as it satisfies the requirements of the SUS, it’s considered UNIX. And it doesn’t matter how you implement it. The XNU kernel at the heart of macOS is a hybrid architecture. It combines Apple’s code with parts of the Mach and BSD kernels.

But that doesn’t matter, either. What matters is it meets the requirements of the standards against which it’s measured.

macOS is a UNIX 03-compliant operating system certified by The Open Group. It has been since 2007, starting with MAC OS X 10.5. The only exception was Mac OS X 10.7 Lion, but compliance was regained with OS X 10.8 Mountain Lion.

Amusingly, just as GNU stands for “GNU’s Not Unix,” XNU stands for “X is Not Unix.”

03-compliant это че значит

compliant гугл перевёл как послушный

Кому не похуй вообще на Юних в 2020 году

На фрибсд