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UNIX System III (or System 3) is a discontinued version of the Unix operating system released by AT&T's Unix Support Group (USG).

AT&T announced System III in late 1981,cite-ref-fiedler198310-2-0[2] and it was first released outside of Bell 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 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 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,cite-ref-3[3]cite-ref-4[4] 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 Unix by outside organizations. However, it did not include notable additions 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 and PC/IX, PC-UX, PNX, SINIX, Venix and Xenix.

• References

• External links

cite-note-11. citerefdolottaolssonpetruccelli1980Dolotta, T. A.; Olsson, S. B.; Petruccelli, A. G., eds. (June 1980). UNIX User's Manual, Release 3.0. Murray Hill, NJ 07974: Laboratory 364, Bell Telephone Laboratories, Incorporated.{{cite book}}: CS1 maint: location (link)

cite-note-fiedler198310-22. ↑ citereffiedler-ryan1983Fiedler, Ryan (October 1983). "The Unix Tutorial / Part 3: Unix in the Microcomputer Marketplace". BYTE. Vol. 8, no. 10. p. 132. Retrieved January 30, 2015.

cite-note-33. ↑ citerefdale-dejager1984Dale Dejager (January 16, 1984). "UNIX History". Newsgroup: net.unix.

cite-note-44. ↑ citereftanenbaum2001Tanenbaum, Andrew S. (2001). Modern Operating Systems (2nd ed.). Upper Saddle River, NJ: Prentice Hall. p. 675. ISBN 0-13-031358-0. Whatever happened to System IV is one of the great unsolved mysteries of computer science.

• citerefsalus2000Salus, Peter H. (April 2000). "20 Years Ago in UNIX". LOGIN. Vol. 25, no. 2. pp. 72–73.

• System III source code

• "UNIX System III on PDP-11". Archived from the original on April 11, 2019.

• "UNIX System III on VAX". Archived from the original on April 11, 2019.