UNIX System III
| Developer | AT&T |
|---|---|
| OS family | Unix |
| Working state | Historic |
| Source model | closed |
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| Internal |
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UNIX System III (or System 3) was a version of the Unix operating system released by AT&T's Unix Support Group (USG). It was first released outside of Bell Labs in 1982. UNIX System III was a mix of various AT&T Unixes: PWB/UNIX 2.0, CB UNIX 3.0, UNIX/TS 3.0.1 and UNIX/32V. System III supported the DEC PDP-11 and VAX 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 as UNIX Release 3.0[1] 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 been System IV) either,[2] so System III was succeeded by System V, based on UNIX/TS 5.0.
System III introduced new features such as named pipes, the uname system call and command, and the run queue. It also combined various improvements to Version 7 by outside organizations. However, it did not include notable improvements made in BSD such as the C shell (csh) and screen editing.
Third-party variants of System III include (early versions of) HP-UX, IRIX, IS/3, PC-UX, PNX, SINIX, Venix and Xenix.
External links
References
- ^ UNIX User's Manual, Release 3.0. Bell Telephone Laboratories. June 1980.
{{cite book}}: Unknown parameter|editors=ignored (|editor=suggested) (help) - ^ Dale Dejager (1984-01-16). "UNIX History". Newsgroup: net.unix.
