KornShell
Computer program
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KornShell is a Unix shell which was developed by David Korn at Bell Labs in the early 1980s and announced at USENIX on July 14, 1983. The initial development was based on Bourne shell source code. Wikipedia
Initial release: 1983; 41 years ago
Operating system: Unix and Unix-like (e.g. Linux and macOS; also works in Windows 10)
Original author(s): David Korn
Preview release: 93v- / December 24, 2014; 9 years ago
Written in: C