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OpenServer 6.x
UnixWare 7.x (System V R5)
HP-UX 11i+
1969
1971 to 1973
1974 to 1975
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001 to 2004
2006 to 2007
2008
2005
2009
2010
2011
2012 to 2015
2016
2017
2018
2019
Open source
Mixed/shared source
Closed source
HP-UX 1.0 to 1.2
OpenSolaris & derivatives (illumos, etc.)
System III
System V R1 to R2
OpenServer 5.0.5 to 5.0.7
OpenServer 5.0 to 5.04
SCO UNIX 3.2.4
SCO Xenix V/386
SCO Xenix V/386
SCO Xenix V/286
SCO Xenix
Xenix 3.0
Xenix 1.0 to 2.3
PWB/Unix
AIX 1.0
AIX 3.0-7.2
OpenBSD 2.3-6.7
OpenBSD 1.0 to 2.2
SunOS 1.2 to 3.0
SunOS 1 to 1.1
Unix/32V
Unix Version 1 to 4
Unix Version 5 to 6
Unix Version 7
Unnamed PDP-7 operating system
BSD 1.0 to 2.0
BSD 3.0 to 4.1
BSD 4.2
Unix Version 8
Unix 9 and 10 (last versions from Bell Labs)
NexTSTEP/ OPENSTEP 1.0 to 4.0
Mac OS X Server
Mac OS X, OS X, macOS 10.0 to 10.15 (Darwin 1.2.1 to 19)
Minix 1.x
Minix 2.x
Minix 3.1.0-3.4.0
Linux 2.x
Linux 0.95 to 1.2.x
Linux 0.0.1
BSD 4.4-Lite & Lite Release 2
NetBSD 0.8 to 1.0
NetBSD 1.1 to 1.2
NetBSD 1.3
NetBSD 1.3-8.1
FreeBSD 1.0 to 2.2.x
386BSD
BSD Net/2
Solaris 10
Solaris 11.0-11.4
System V R4
Solaris 2.1 to 9
BSD 4.3
SunOS 4
HP-UX 2.0 to 3.0
HP-UX 6 to 11
System V R3
UnixWare 1.x to 2.x (System V R4.2)
BSD 4.3 Tahoe
BSD 4.3 Reno
FreeBSD 3.0 to 3.2
FreeBSD 3.3-12.x
Linux 3.x
Linux 4.x
OpenServer 10.x
DragonFly BSD 1.0 to 4.8
BSD Net/1
Unix-like systems
Linux 5.x