Fourth edition UNIX was written in C in 1973: https://gunkies.org/wiki/UNIX_Fourth_Edition https://gunkies.org/wiki/UNIX_Fourth_Edition Unless we have differe

Fourth edition UNIX was written in C in 1973: https://gunkies.org/wiki/UNIX_Fourth_Edition https://gunkies.org/wiki/UNIX_Fourth_Edition Unless we have different definitions of "edition".