CB UNIX

Columbus UNIX, also called CB UNIX, is a discontinued variant of the UNIX operating system used internally at Bell Labs for administrative databases and transaction processing. It was developed at the Columbus, Ohio branch of Bell Labs, based on the Sixth Edition, Seventh Edition and PWB Unix, and was little known outside the company. CB UNIX was created to address deficiencies in Research Unix, notably the lack of interprocess communication and file locking considered essential for a database management system, and several Bell System operations support products, such as the Switching Control Center System, were based on it. Its primary innovations were power fail restart, line disciplines, terminal types and interprocess communication features. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/