> Linux distributions are not even UNIX, just UNIX compatible.
Depends on how you define "UNIX". If you define it as "Derived from the V6 codebase", then I'm pretty sure a number of the OSes you mentioned don't qualify. If you define it as "Legally able to use the trademark", then you miss a lot of OSes that work just fine with POSIX-compatible software, such as FreeBSD, and include z/OS, which is just perverse.
Depends on how you define "UNIX". If you define it as "Derived from the V6 codebase", then I'm pretty sure a number of the OSes you mentioned don't qualify. If you define it as "Legally able to use the trademark", then you miss a lot of OSes that work just fine with POSIX-compatible software, such as FreeBSD, and include z/OS, which is just perverse.