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UNIX System V
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{{Short description|Early commercial UNIX operating system}} {{Redirect|System 5|the Mac OS version|Classic Mac OS#System Software 5}} {{Redirect|SysV|the Init|Init#SysV-style}} {{Distinguish|Version 5 Unix}} {{Use American English|date = April 2019}} {{Infobox OS | name = Unix System V | logo = | screenshot = [[File:HP-HP9000-715-100-Workstation_03.jpg|frameless]] | caption = [[HP 9000]] workstation booting [[HP-UX]], [[Hewlett-Packard]]'s System V | developer = [[AT&T Corporation]] | family = [[Unix]] | working state = Historic | source model = [[Closed source]] except for [[OpenSolaris]] and its derivatives | released = {{Start date and age|1983}}<ref>{{cite web|url=https://unix.org/Posters/download/unix_posterA3_Screen.pdf|title=The Single UNIX® Specification History & Timeline|website=unix.org|date=2004}}</ref> | discontinued = <!-- DON'T use this for articles about releases of operating systems --> | RTM date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} ONLY for articles about OS releases --> | GA date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} ONLY for articles about OS releases --> | latest release version = | latest release date = | latest preview version = | latest preview date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} --> | marketing target = | programmed in = [[C (programming language)|C]] | language = [[English language|English]]<!-- Supported human languages (English, French, Italian, Arabic, ...) --> | update model = <!-- APT, Windows Update, etc. --> | package manager = <!-- dpkg, rpm, Windows installer, etc. --> | supported platforms = <!-- IA-32, x64, Itanium, ARM, etc. --> | kernel type = <!-- Hybrid, Monolithic, Microkernel, Exokernel, Nanokernel, etc. --> | userland = | ui = [[Command-line interface]] | license = | preceded by = [[UNIX System III]] | succeeded by = [[UnixWare]] | website = <!-- {{URL|www.example.org}} --> | support status = <!-- For articles about releases of operating systems ONLY --> | other articles = }} '''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 Corporation|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 [[IBM AIX|AIX]], [[Hewlett Packard Enterprise]]'s [[HP-UX]] and [[Oracle Corporation|Oracle]]'s [[Solaris (operating system)|Solaris]],<ref name="lastdays">{{cite web |url=https://www.networkworld.com/article/677972/servers-the-last-days-of-unix.html |title=The Last Days of Unix |author=Julie Sartain |website=Network World |date=19 August 2013 |access-date=9 January 2024}}</ref> plus the free-software [[illumos]] forked from [[OpenSolaris]].
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