https://en.wikipedia.org/wiki/Unix
WebUnix (/ ˈ j uː n ɪ k s /; trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.. Initially intended for use inside the Bell System, AT&T licensed Unix to outside parties in …