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Unix is a portable, multitasking, multiuser, time-sharing operating system (OS) originally developed in 1969 by a group of employees at AT&T. Unix was first programmed in assembly language but was reprogrammed in C in 1973.
Unix has been ported to more machine families than any other operating system. As a result, it has come to be identified with the concept of open systems. Unix operating systems are widely used in PCs, servers and mobile devices. The Unix environment was also an essential element in the development of the Internet and networking.
Unix was developed based on the philosophy that the power of the system comes from the relationships among programs, rather than on the programs themselves. Unix programs are written to do one thing well, and programs are written so that they work together. As such, Unix developers espouse simplicity, portability and clarity in design. In order to adhere to this philosophy, Unix systems are characterized by:
Unix had a significant impact on other operating systems and can be credited (in whole or in part) for the following:
Free Unix-like operating systems such as Linux and BSD now hold a large portion of the market originally held by Unix.