List of Unix systems

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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.

Historical flow chart of Unix and Unix-like variants.

Research Unix[edit]

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 4.3BSD-Reno are based on Research Unix, with versions starting with 4.4 BSD and Net/2 instead becoming Unix-like.

Commercial AT&T UNIX Systems and descendants[edit]

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.

  • 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)

Forks and ports[edit]

Unix-like operating systems[edit]

See also[edit]