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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, [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.
After the release of Version 10, the Unix research team at Bell Labs turned its focus to Plan 9 from Bell Labs, a distinct operating system that was first released to the public in 1993. All versions of BSD from its inception up to 4.3BSD-Reno are based on Research Unix, with versions starting with 4.4 BSD and Net/2 instead becoming Unix-like.
Version 7 in 1979 was the final widely released Research Unix, after which AT&T sold UNIX System III, based on Version 7, commercially in 1982; to avoid confusion between the Unix variants, AT&T combined various versions developed by others and released it as UNIX System V in 1983. However as these were closed-source, the University of ...
AT&T provided support for System III and System V through the Unix Support Group (USG), and these systems were sometimes referred to as USG Unix. [citation needed] In 1983, the U.S. Department of Justice settled its second antitrust case against AT&T, causing the breakup of the Bell System. This relieved AT&T of the 1956 consent decree that had ...
In the mid-1980s, the three common versions of Unix were AT&T's System III, the basis of Microsoft's Xenix and the IBM-endorsed PC/IX, among others; AT&T's System V, which it sought to establish as the new Unix standard; [2] and the Berkeley Software Distribution (BSD). All were derived from AT&T's Research Unix but had diverged considerably ...
3BSD, UNIX System III UNIX/32V is an early version of the Unix operating system from Bell Laboratories , released in June 1979. 32V was a direct port of the Seventh Edition Unix to the DEC VAX architecture.
This is a list of POSIX (Portable Operating System Interface) commands as specified by IEEE Std 1003.1-2024, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating systems and most Unix-like operating systems.
UNIX Time-Sharing System v5; UNIX Time-Sharing System v6. MINI-UNIX; PWB/UNIX. USG CB Unix; UNIX Time-Sharing System v7 (It is from Version 7 Unix (and, to an extent, its descendants listed below) that almost all Unix-based and Unix-like operating systems descend.) Unix System III; Unix System IV; Unix System V. Unix System V Releases 2.0, 3.0 ...