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Yes, it is all Unix
(feddit.nl)
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MacOS was not Unix based until OSX (10). MacOS 9 and prior were based on the classic Macintosh kernel.
"macOS" is not the same as "Mac OS"!
"Mac OS X" was rebranded to "macOS" (or rather, "macOS" is the successor to "Mac OS X", but really just is the same but newer, the "upgrade" was just like any other update between Mac OS X versions afaik), and "Mac OS 9" does not belong to "macOS".
IIRC Mac OS X was changed to OS X before it was changed to macOS. Not that it matters here
Edit: 10.0 to 10.7 were Mac OS X, 10.8 to 10.11 was OS X, 10.12 and later macOS.