Xenix
Operating system
Xenix is a discontinued version of the Unix operating system for various microcomputer platforms, licensed by Microsoft from AT&T Corporation in the late 1970s. The Santa Cruz Operation later acquired exclusive rights to the software, and... Wikipedia
Initial release: 1980; 44 years ago
Default user interface: Command-line interface
Latest release: System V Release 2.3.4 / 1991; 33 years ago
License: Proprietary
OS family: Unix (SysV)