UNIX System V
Operating system
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Unix System V is one of the first commercial versions of the Unix operating system. It was originally developed by AT&T and first released in 1983. Four major versions of System V were released, numbered 1, 2, 3, and 4. Wikipedia
Initial release: 1983; 41 years ago
Release date: 1983
Default user interface: Command-line interface
Developer: AT&T Corporation
OS family: Unix
Source model: Closed source except for OpenSolaris and its derivatives
Working state: Historic