 Early commercial UNIX operating system | |
| Developer | AT&T Corporation |
|---|---|
| Written in | C |
| OS family | Unix |
| Working state | Historic |
| Source model | Closed source except for OpenSolaris and its derivatives |
| Initial release | 1983 (1983)1 |
| Available in | English |
| Default user interface | Command-line interface |
| Preceded by | UNIX System III |
| Succeeded by | |
| UnixWare |
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,2 being the result of an effort, marketed as Unix System Unification,3 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.
As of 2026, the AT&T-derived Unix market is divided between three System V variants: IBM's AIX, Oracle's Solaris,4 and the free-software illumos forked from OpenSolaris.
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