Note that each of the iterations of the UNIX Time-Sharing System are evolved from the version before, with version one evolving from the prototypal UNICS. Not all variants and descendants of UNIX are displayed.

• UNICS (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 (1974)
  • Mini Unix (1977)
  • PWB 1.0 (1977)
    • USG 1.0
      • CB Unix 1
  • UCLA Secure UNIX (1979)

• UNIX Time-Sharing System v7 (1979)
  • Xenix OS (1980)
    • SCO Xenix (1985)
  • Unix System III (1981)
    • For descendants of System III, see AT&T UNIX systems subsection
  • Minix 1.0 (1987)

• UNIX Time-Sharing System v8 (1985)
• UNIX Time-Sharing System v9 (1986)
• UNIX Time-Sharing System v10 (1989)

AT&T UNIX Systems & 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.

• 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 1.1 (1993)
• UnixWare 1.1.1 (1994)
• UnixWare 2.0 (1995)
• UnixWare 2.1 (1996)
• UnixWare 2.1.2 (1996)
• UnixWare 7 (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 (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)

Minix

Each of the systems in this list is evolved from the version before, with Minix 1.0 evolving from the UNIX Time-Sharing System v7.

• Minix 1.0 (1987)
  • Linux 0.01 (1991)
• Minix 1.5 (1992)
• Minix 1.7.2 (1996)
• Minix 2.0.0 (1997)
• Minix 2.0.2 (1998)
• Minix 2.0.3 (2001)

Linux kernel

Each of the kernels in this list is evolved from the kernel before, with Linux 0.01 inspired by Minix 1.0.

• Linux 0.01 (1991)
• Linux 0.02 (1991)

External link

• Large graphical family tree of Unices