How many different families of operating systems exist in unix?

Question by bermuda890: How many different families of operating systems exist in unix?
I know that Mac OS, Linux, Open Solaris, and BSD are related to Unix, are there any other operating systems that are based on or related to unix? Please don’t not include variants of any of that already mentioned operating systems, such as FreeBSD, Or any Linux-based distros.

Also, is there any other family of operating systems separate from Unix?
I guess what I am looking for is an OS which could be run on a modern computer.

Best answer:

Answer by hands.adrian
many hardware mfgs (both system and chip) have their own (usually not free) unix variant. e.g. aix, hp-ux, xenix, tru64, unicos, etc…

when you say “family of operating systems separate from Unix” would you include things like mainframe os? dead/obsolete os? real-time os?

What do you think? Answer below!

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