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Coherent

Operating system
Coherent is a clone of the Unix operating system for IBM PC compatibles and other microcomputers, developed and sold by the now-defunct Mark Williams Company. Historically, the operating system was a proprietary product, but it became open source... Wikipedia
Initial release date: 1983
Default user interface: Command-line (KornShell)
Latest release: 4.2.14 / 1994; 30 years ago
OS family: Unix-like
Source model: Closed source; open sourced in 2015