List of Unix systems
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.
Research Unix Systems and descendants
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 released in 1993, and later on Inferno. 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. Furthermore, 8th Edition Research Unix and on-wards had a close relationship to BSD. This began by using 4.1cBSD as the basis for the 8th Edition. In a Usenet post from 2000, Dennis Ritchie described these later versions of Research Unix as being closer to BSD than they were to UNIX System V, which also included some BSD code:Commercial 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.Forks and ports
- 386/ix
- AIX
- Amdahl UTS
- Amiga Unix
- Atari System V
- A/UX
- BOS
- CLIX (Unix version)
- COSIX
- DC/OSx
- DG/UX
- DYNIX/ptx
- EWS-UX
- ESIX
- HP-UX
- illumos
- IS
- IRIX
- IX/370
- MIPS RISC/os
- NEWS-OS
- OSF/1
- PC/IX
- PC-UX
- PNX
- Project Monterey
- SCO Unix
- SINIX
- Solaris
- SUPER-UX
- Tru64 UNIX
- UNICOS
- Uniplus+
- Unix/NS
- UXP/DS
- Venix
- XENIX
Other Unix operating systems
Below are other certified Unix operating systems:- macOS: Heavily based on BSD, macOS is registered as certified Unix 03 brand on both versions.
- SCO OpenServer: Another operating system by SCO. Registered as Unix 93 “single and Multi-processor Industry Standard Intel architecture platform”.
- z/OS: z/OS by IBM is listed as two different operating systems, z/OS and z/OS V2R1. Both are Unix 95.