UNIX System V

Unix operating system originally developed by Sun Microsystems

Unix operating system from IBM

Xenix is a discontinued Unix operating system for various microcomputer platforms, licensed by Microsoft from AT&T Corporation. The first version was released in 1980, and Xenix was the most common Unix variant during the mid- to late-1980s. The Santa Cruz Operation (SCO) acquired exclusive rights to the software, and eventually replaced it with SCO UNIX, later known as OpenServer 5, with the final Xenix version released in 1991.

IRIX (, , a portmanteau of IRIS and UNIX) is a discontinued operating system developed by Silicon Graphics (SGI) to run on the company's proprietary MIPS workstations and servers. It is based on UNIX System V with BSD extensions. In IRIX, SGI originated the XFS file system and the now industry-standard OpenGL graphics API.

thumb|HPE Superdome running HP-UX 11.23 OS thumb|HP 9000/425 [[workstation running HP-UX 9 with HP-VUE ]] thumb|The HP 9000-B180L workstation running HP-UX 10.20 with CDE thumb|Hewlett-Packard|HP C8000 [[workstation running HP-UX 11i]]

most-referenced Unix version and starting point for the first versions of POSIX and the Single UNIX Specification

UnixWare is a Unix operating system. It was originally released by Univel, a jointly owned venture of AT&T's Unix System Laboratories (USL) and Novell. It was then taken over by Novell. Via Santa Cruz Operation (SCO), it went on to Caldera Systems, Caldera International, and The SCO Group before it was sold to UnXis (now Xinuos). After the acquisition of SCO by Caldera, the name was briefly changed to Open UNIX before being reverted to the original name in the next release. Binary distributions of UnixWare are available for x86 architecture computers. UnixWare is primarily marketed and deploye

thumb|upright|right|SCO OpenServer Release 5.0.7 box set

SunOS is a Unix-branded operating system developed by Sun Microsystems for their workstation and server computer systems from 1982 until the mid-1990s. The SunOS name is usually only used to refer to versions 1.0 to 4.1.4, which were based on BSD, while versions 5.0 and later are based on UNIX System V Release 4 and are marketed under the brand name Solaris.

UNICOS is a range of Unix and later Linux operating system (OS) variants developed by Cray for its supercomputers. UNICOS is the successor of the Cray Operating System (COS). It provides network clustering and source code compatibility layers for some other Unixes. UNICOS was originally introduced in 1985 with the Cray-2 system and later ported to other Cray models. The original UNICOS was based on UNIX System V Release 2, and had many Berkeley Software Distribution (BSD) features (e.g., computer networking and file system enhancements) added to it.

operating system

Venix is a discontinued version of the Unix operating system for low-end computers, developed by VenturCom, a "company that specialises in the skinniest implementations of Unix".

Network operating system (obsoleted)

early UNIX operating system specification

SINIX is a discontinued variant of the Unix operating system from Siemens Nixdorf Informationssysteme. SINIX supersedes SIRM OS and Pyramid Technology's DC/OSx. Following X/Open's acceptance that its requirements for the use of the UNIX trademark were met, version 5.44 and subsequent releases were published as Reliant UNIX by Fujitsu Siemens Computers.

SUPER-UX was a version of the Unix operating system from NEC that is used on its SX series of supercomputers.

early personal computer

operating system

UNIX workstation series