Unix is an operating system that originated in 1969 at AT&T Bell Labs. It was first widely used in 1975 and is designed as a mulit-user, multi-tasking, high-performance operating system with networking in mind.

Unix is a text-based operating system that uses terse commands and messages to reduce typing and output. It is the operating system of choice for most scientific and engeineering workstations. Unix is hardware independent -- it can be transferred easily from one hardware system to another. Many companies produced their own versions of Unix, for example, SunOS, Solaris, AIX, HP/UX, IRIX, MACH, and Linux.