| UNIX System III | |
|---|---|
 UNIX System III on SIMH (PDP-11) | |
| Developer | AT&T's Unix Support Group (USG) |
| Written in | C |
| OS family | Unix |
| Working state | Discontinued |
| Source model | Closed source |
| Initial release | 1980; 46 years ago (1980)[1] |
| Available in | English |
| Supported platforms | DECPDP-11 andVAX |
| Default user interface | Command-line interface |
| Succeeded by | UNIX System V |
UNIX System III (orSystem 3) is a discontinued version of theUnix operating system released byAT&T's Unix Support Group (USG).
AT&T announced System III in late 1981,[2] and it was first released outside ofBell Labs in 1982. UNIX System III was a mix of various AT&T Unix systems:Version 7 Unix,PWB/UNIX 2.0,CB UNIX 3.0,UNIX/RT andUNIX/32V. System III supported theDECPDP-11 andVAX computers.
The system was apparently called System III because it was considered the outside release of UNIX/TS 3.0.1 and CB UNIX 3 which were internally supported Bell Labs Unices; its manual refers to it asUNIX Release 3.0 and there were no Unix versions called System I or System II. There was no official release of UNIX/TS 4.0 (which would have beenSystem IV) either,[3][4] so System III was succeeded bySystem V, based on UNIX/TS 5.0.
System III introduced new features such asnamed pipes, theuname system call and command, and therun queue. It also combined various improvements toVersion 7 Unix by outside organizations. However, it did not include notable additions made inBSD such as theC shell (csh) and screen editing.
Third-party variants of System III include (early versions of)HP-UX,IRIX,IS/3 andPC/IX,PC-UX,PNX,SINIX,Venix andXenix.
{{cite book}}: CS1 maint: location (link)Whatever happened to System IV is one of the great unsolved mysteries of computer science.
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