UNIX System III

UNIX System III, also called System 3, is a discontinued version of the Unix operating system released by the Unix Support Group at AT&T, announced in late 1981 and first released outside Bell Labs in 1982. It combined several internal AT&T Unix systems, including Version 7 Unix, PWB/UNIX 2.0, CB UNIX 3.0, UNIX/RT, and UNIX/32V, and supported the DEC PDP-11 and VAX computers, introducing features such as named pipes, the uname system call, and the run queue. Because there was no official System I, System II, or UNIX/TS 4.0 release, System III was succeeded directly by System V, and third party variants of System III included early versions of HP-UX, IRIX, PC/IX, SINIX, Venix, and Xenix. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/