UNIX System V

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.

"System 5" redirects here. For the Mac OS version, see Classic Mac OS § System Software 5.
"SysV" redirects here. For the Init, see Init § SysV-style.
Not to be confused with Version 5 Unix.

Unix System V
HP 9000 workstation booting HP-UX, Hewlett-Packard's System V
DeveloperAT&T Corporation
Written inC
OS familyUnix
Working stateHistoric
Source modelClosed source except for OpenSolaris and its derivatives
Initial release1983 (1983)
Available inEnglish
Default
user interface		Command-line interface
Preceded byUNIX System III
Succeeded byUnixWare

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.

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