UNIX

      The Unix operating system was first developed in assembly language, but by 1973 had been almost entirely recoded in C, greatly facilitating its further development and porting to other hardware.

      Today's Unix systems are split into various branches, developed over time by AT&T as well as various commercial vendors and non-profit organizations.

      The term "traditional Unix" may be used to describe a Unix or an operating system that has the characteristics of either Version 7 Unix or UNIX System V.

PICTURE UNIX