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How commercial Unix fractured across codebases and alliances while POSIX and the Single UNIX Specification preserved portable interfaces.
Why Haiku is a BeOS-compatible system with NewOS kernel roots and native Kits, despite its POSIX APIs, shell, ports, and Unix software.
Every shell in daily use today descends from a 1971 command interpreter, branching through PWB, Bourne, and C shell into the families still visible now.
On May 18, 2007, Leopard on Intel Macs became the first BSD-based OS to earn Open Brand UNIX 03 certification, making 'Mac OS X is Unix' a certified fact.