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Each version of the UNIX Time-Sharing System evolved from the version before, with version one evolving from the prototypal Unix. Not all variants and descendants are displayed.
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The versions leading to v7 are also sometimes called Ancient UNIX. After the release of Version 10, the Unix research team at Bell Labs turned its focus to Plan 9 from Bell Labs, a distinct operating system that was first released to the public in 1993. All versions of BSD from its inception up to History of the Berkeley Software Distribution#4.3BSD|4.3BSD-Reno are based on Research Unix, with versions starting with History of the Berkeley Software Distribution#4.4BSD and descendants|4.4 BSD and History of the Berkeley Software Distribution#Net/2 and legal troubles|Net/2 instead becoming Unix-like.
Each of the systems in this list is evolved from the version before, with Unix System III evolving from both the UNIX Time-Sharing System v7 and the descendants of the UNIX Time-Sharing System v6.
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Below are other certified Unix operating systems. [2]
Heavily based on BSD, macOS is registered as certified Unix 03 brand on both versions (Intel and Apple silicon-based).
Another operating system by SCO. Registered as Unix 93 “single and Multi-processor Industry Standard Intel architecture platform”.
z/OS by IBM is listed as two different operating systems, z/OS and z/OS V2R1. Both are Unix 95.