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@thomasfuchs AFAICT, vanishingly little of MacOS X (now macOS), probably not even a single line of code, came from original Unix. That doesn't seem like a "direct line" to me, but rather a meander all over the place.
Reminds me just a tiny bit of the widespread (but spurious) claims that QDOS/86DOS/MS-DOS/IBMDOS was built on code from CP/M.