> so can I say Mac is a distro of unix?
Yes, I think that’s fair to say. [MacOS is officially a UNIX operating system](https://www.opengroup.org/openbrand/register/brand3678.htm), though it’s worth keeping in mind that what that really means is conformance to a baseline of specifications and that OSes build a *bunch* of stuff on top of that, including literally everything that makes MacOS distinctive.
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