>>546014
OS X is not UNIX.
It may have a certification of being UNIX-compatible, but the important aspects are very different.
UNIX was created as a portable operating system and pushed for simple but reliable design that is naturally extensible.
OS X is a walled garden locked to specific hardware where you are forbidden to touch things for your own safety and has an XML-based init system (so much for simplicity).
If anything, OS X is a regression in the field of operating systems.