In the late 1960s, Bell Labs was involved in a project with MIT and General Electric to develop a time-sharing system, called Multiplexed Information and Computing Service (Multics), allowing multiple users to access a

Bell developed multiple versions of Unix for internal use, such as CB UNIX (with improved support for databases) and PWB/UNIX, the "Programmer's Workbench", aimed at large groups of programmers. It advertised the latter version, as well as 32V

In 2000, SCO sold its entire UNIX business and assets to Caldera Systems, which later changed its name to The SCO Group.
The bursting of the dot-com bubble (2001–03) led to significant consolidation of versions of Unix. Of the many commercial variants of

Books
• Kernighan, Brian W. (2019). UNIX: A History and a Memoir. Independently published.

The new operating system was initially without organizational backing, and also without a name. At this stage, the new operating system was a singletasking operating system, not a multitasking one such as Multics. The name Unics (Uniplexed Information

The Unix wars continued into the 1990s, but turned out to be less of a threat than originally thought: AT&T and Sun went their own ways after System V.4, while OSF/1's schedule slipped behind. By 1993, most commercial vendors changed their variants of Unix to be

• Comparison of operating systems
• List of Unix systems
• Operating systems timeline
• Plan 9 from Bell Labs