OS UNIX

- Unix is a computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, and Joe Ossanna
- The influence of Unix in academic circles led to large-scale adoption of Unix by commercial startups, the most notable of which are Mac OS X, Solaris, HP-UX and AIX
- Unix-like operating systems such as Linux and BSD are commonly encountered
- An operating system that has the characteristics of either Version 7 Unix or UNIX System V.
- Unix operating systems are widely used in both servers and workstations.
- Both Unix and the C programming language were developed by AT&T and distributed to government and academic institutions.
- Unix was designed to be portable, multi-tasking and multi-user in a time-sharing configuration.
- The kernel provides services to start and stop programs, handles the file system and other common "low level" tasks that most programs share, and, perhaps most importantly.
- The Unix system is composed of several components that are normally packed together.
- The inclusion of these components did not make the system large.
- The names and filesystem locations of the Unix components have changed substantially across the history of the system.
- Nonetheless, the V7 implementation is considered by many to have the canonical early structure Kernel, Development Environment, Commands,  Documentation.