Cosa (chi) è SVR4 - definizione
![[[AT&T]] System V [[license plate]]](https://commons.wikimedia.org/wiki/Special:FilePath/ATT UNIX System V License Plate.jpeg?width=200 "[[AT&T]] System V [[license plate]]")
![[[HP 9000]] 735 running [[HP-UX]] with the [[Common Desktop Environment]] (CDE)](https://commons.wikimedia.org/wiki/Special:FilePath/HP-HP9000-735-99-Workstation 02.jpg?width=200 "[[HP 9000]] 735 running [[HP-UX]] with the [[Common Desktop Environment]] (CDE)")
![[[HP 9000]] C110 running [[HP-UX]] in console mode](https://commons.wikimedia.org/wiki/Special:FilePath/HP-HP9000-C110-Workstation 10.jpg?width=200 "[[HP 9000]] C110 running [[HP-UX]] in console mode")
![MATE]] desktop on [[OpenIndiana]], an SVR4 derivative](https://commons.wikimedia.org/wiki/Special:FilePath/OpenIndiana Hipster 2021.10 MATE desktop environment screenshot.png?width=200 "MATE]] desktop on [[OpenIndiana]], an SVR4 derivative")
![A [[GNOME]]-based [[OpenSolaris]] desktop](https://commons.wikimedia.org/wiki/Special:FilePath/OpenSolaris 2009.06 screenshot.png?width=200 "A [[GNOME]]-based [[OpenSolaris]] desktop")
![[[OpenWindows]], an early [[desktop environment]] for SVR4](https://commons.wikimedia.org/wiki/Special:FilePath/Openwindows.jpg?width=200 "[[OpenWindows]], an early [[desktop environment]] for SVR4")
![Solaris]] 10](https://commons.wikimedia.org/wiki/Special:FilePath/Sun Ultra 20 Workstation (2005).jpeg?width=200 "Solaris]] 10")
![DEC]] [[VAX-11/780]] was the porting base for SVR2](https://commons.wikimedia.org/wiki/Special:FilePath/VAX 11-780 intero.jpg?width=200 "DEC]] [[VAX-11/780]] was the porting base for SVR2")
Wikipedia
Unix System V (pronounced: "System Five") is one of the first commercial versions of the Unix operating system. It was originally developed by AT&T and first released in 1983. Four major versions of System V were released, numbered 1, 2, 3, and 4. System V Release 4 (SVR4) was commercially the most successful version, being the result of an effort, marketed as Unix System Unification, which solicited the collaboration of the major Unix vendors. It was the source of several common commercial Unix features. System V is sometimes abbreviated to SysV.
As of 2021, the AT&T-derived Unix market is divided between four System V variants: IBM's AIX, Hewlett Packard Enterprise's HP-UX and Oracle's Solaris, plus the free-software illumos forked from OpenSolaris.
