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Is there any OS that’s fully POSIX-compliant?
Yes, in fact, there’s a formal certification process by the IEEE and the Open Group.
https://en.wikipedia.org/wiki/POSIX#POSIX-oriented_operating_systems
Mind you, I think only one of the fully-certified OSen has any substantial use these days (MacOS X). People tend to overvalue it, IMO.
Thank you for educating this dumbass.