> macOS is a certified Unix. So's z/OS, whereas FreeBSD isn't. Also, there are Linux distros that are certified Unixes: Inspur K-UX, for example. > Unix Hate

> macOS is a certified Unix. So's z/OS, whereas FreeBSD isn't. Also, there are Linux distros that are certified Unixes: Inspur K-UX, for example. > Unix Hater's Handbook Ah, yes, the "our favorite proprietary system was killed by Open Systems and we're Big Mad about it" book.