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The first desktop version, Mac OS X 10.0, was released on March 24, 2001. Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard and all releases from OS X 10.8 Mountain Lion to macOS 14 Sonoma are UNIX 03 certified
I don't like MacOS, but it's actually able to be called UNIX.
I'm surprised you don't lose Unix certification with crap like case insensitive filesystem defaults.
I don't want to be like Stack Overflow, but tbh you have some design problems if you rely on case sensitive filesystems.
I haven’t heard this before, what are they?
Most importantly readability and usability for the user and debugging. Some programs aren't case sensitive.
That last point is somewhat amusing considering you have to go out of your way to make your program case-insensitive.
Both HFS Plus and APFS can have case sensitivity enabled, it's optional.
Enabling it has had a tendency to break third party Mac software though. Adobe used to be a particularly bad offender there.
And Steam.
Being able to be called Unix just means paying for certification. No more, no less.
Well you still have to check all the boxes, you pay for the license the same way you can study and take certain exams but have to pay for the certificate.