Each version of the UNIX

Unix

Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, and Joe Ossanna...

 Time-Sharing System evolved from the version before, with version one evolving from the prototypal Unics. Not all variants and descendants are displayed.

Research Unix

Ken's new system (→Unix) (1969) UNIX Time-Sharing System v1 (1971) UNIX Time-Sharing System v2 (1972) UNIX Time-Sharing System v3 (1973) UNIX Time-Sharing System v4 (1973) UNIX Time-Sharing System v5 (1974) UNSW 01 (1978) UNIX Time-Sharing System v6 Version 6 Unix Sixth Edition Unix, also called Version 6 Unix or just V6, was the first version of the Unix operating system to see wide release outside Bell Labs. It was released in May 1975 and, like its direct predecessor, targeted the DEC PDP-11 family of minicomputers... (1974) MINI-UNIX (1977) PWB/UNIX PWB/UNIX The Programmer's Workbench was an early version of the Unix operating system created in the Bell Labs Computer Science Research Group of AT&T....  1.0 (1977) USG 1.0 CB Unix CB Unix Columbus UNIX was, according to Marc Rochkind, a variant of the UNIX operating system internal to Bell Labs. It was developed at the Columbus, Ohio branch and was little-known outside the company...  1

UNIX Time-Sharing System v7 Version 7 Unix Seventh Edition Unix, also called Version 7 Unix, Version 7 or just V7, was an important early release of the Unix operating system. V7, released in 1979, was the last Bell Laboratories release to see widespread distribution before the commercialization of Unix by AT&T in the early 1980s... (1979) Unix System III (1981) UNIX Time-Sharing System v8 Version 8 Unix Eighth Edition Unix, also known as Version 8 Unix or V8, was a version of the Research Unix operating system developed and used internally at Bell Labs and a select number of universities. It was "released" in February 1985, ran on VAX hardware, and was a variant of 4.1cBSD with some System V.1 ... (1985) UNIX Time-Sharing System v9 Version 9 Unix Ninth Edition Unix, also known as Version 9 Unix or V9, was a version of the Research Unix operating system developed and used internally at the Bell Labs Information Sciences Research Division, "released" in September 1986. V9 was the successor to V8, and the predecessor to the last Research Unix... (1986) UNIX Time-Sharing System v10 Version 10 Unix Tenth Edition Unix, also known as Version 10 Unix or V10, was the last version of the Research Unix operating system developed and used internally at Bell Labs. "Released" in 1989, it was the successor of V9... (1989)

After the release of Version 10, the Unix research team at Bell Labs

Bell Labs

Bell Laboratories is the research and development subsidiary of the French-owned Alcatel-Lucent and previously of the American Telephone & Telegraph Company , half-owned through its Western Electric manufacturing subsidiary.Bell Laboratories operates its...

 turned its focus to Plan 9 from Bell Labs

Plan 9 from Bell Labs

Plan 9 from Bell Labs is a distributed operating system. It was developed primarily for research purposes as the successor to Unix by the Computing Sciences Research Center at Bell Labs between the mid-1980s and 2002...

, a distinct operating system that was first released to the public in 1993.

AT&T UNIX Systems and descendants

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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Unix System III (1981) Unix System IV (1982) Unix System V (1983) Unix System V Release 2 (1984) Unix System V Release 3.0 (1986) Unix System V Release 3.2 (1987) Unix System V Release 4 (1988) Unix System V Release 4.2 (1992) UnixWare UnixWare UnixWare is a Unix operating system maintained by The SCO Group . UnixWare is typically deployed as a server rather than desktop. Binary distributions of UnixWare are available for x86 architecture computers. It was originally released by Univel, a jointly owned venture of AT&T's Unix System...  1.1 (1993) UnixWare 1.1.1 (1994) UnixWare 2.0 (1995) UnixWare 2.1 (1996) UnixWare 2.1.2 (1996)

UnixWare 7 (System V Release 5) (1998) UnixWare 7.0.1 (1998) UnixWare 7.1 (1999) UnixWare 7.1.1 (1999) UnixWare NSC 7.1+IP (2000) UnixWare NSC 7.1+LKP (2000) UnixWare NSC 7.1DCFS (2000) Open Unix 8 (UnixWare 7.1.2) (2001) Open Unix 8MP1 (2001) Open Unix 8MP2 (2001) Open Unix 8MP3 (2002) Open Unix 8MP4 (2002) SCO UnixWare 7.1.3 (2002) SCO UnixWare 7.1.3 Update Pack 1 (2003) SCO UnixWare 7.1.4 (2004)