UNIX System III

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;44 years ago
Available in	English
Platforms	DECPDP-11andVAX
Default; user interface	Command-line interface
Succeeded by	UNIX System V

UNIX System III(orSystem 3) is a discontinued version of theUnixoperating 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 Labsin 1982. UNIX System III was a mix of various AT&T Unix systems:Version 7 Unix,PWB/UNIX2.0,CB UNIX3.0,UNIX/RTandUNIX/32V.System III supported theDEC PDP-11andVAXcomputers.

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 3.0and 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,theunamesystem call and command, and therun queue.It also combined various improvements toVersion 7 Unixby outside organizations. However, it did not include notable additions made inBSDsuch as theC shell(csh) and screen editing.

Third-party variants of System III include (early versions of)HP-UX,IRIX,IS/3andPC/IX,PC-UX,PNX,SINIX,VenixandXenix.

References

^Dolotta, 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)
^Fiedler, Ryan (October 1983)."The Unix Tutorial / Part 3: Unix in the Microcomputer Marketplace".BYTE.Vol. 8, no. 10. p. 132.RetrievedJanuary 30,2015.
^Dale Dejager (January 16, 1984)."UNIX History".Newsgroup:net.unix.
^Tanenbaum, 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.

External links

Salus, 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 fromthe originalon April 11, 2019.
- "UNIX System III on VAX".Archived fromthe originalon April 11, 2019.

[1] Dolotta, 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)

[fiedler198310-2] Fiedler, Ryan (October 1983)."The Unix Tutorial / Part 3: Unix in the Microcomputer Marketplace".BYTE.Vol. 8, no. 10. p. 132.RetrievedJanuary 30,2015.

[3] Dale Dejager (January 16, 1984)."UNIX History".Newsgroup:net.unix.

[4] Tanenbaum, 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.

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v t e UnixbyBell Labs
Research	Version 6 Unix(1975) Version 7 Unix(1979) UNIX/32V(1979)
Internal	CB UNIX(c. 1975) PWB/UNIX(1977) MERT/DMERT/UNIX-RT
Commercial	UNIX System III(1982) UNIX System V(1983)
People	Stephen R. Bourne Lorinda Cherry Tom Duff Stuart Feldman Brian Kernighan David Korn Mike Lesk John Mashey Douglas McIlroy Lee E. McMahon Joe Ossanna Rob Pike Dennis Ritchie Ken Thompson
Companies	AT&T Computer Systems Unix System Laboratories
Category