Also, macOS became officially Unix-certified in 2007 [0], so it can legitimately claim to be a version of Unix. But it's still based on BSD, which is a descend

Also, macOS became officially Unix-certified in 2007 [0], so it can legitimately claim to be a version of Unix. But it's still based on BSD, which is a descendent of the original AT&T Unix. [0] https://arstechnica.com/apple/2007/08/mac-os-x-leopard-receives-unix-03-certification/ https://arstechnica.com/apple/2007/08/mac-os-x-leopard-recei...