Unix

Unix
   Pronounced "[yoo-nix]." A multiuser, multitasking operating system, originally conceived in 1969 at AT&T's Bell Labs by Ken Thompson and Dennis Ritchie.
   Since then, Unix has gone on to become the most widely used general purpose operating system in the world. Over the last 25 years, there have been three major strands in Unix development:
   • Original AT&T Unix from Versions 1 to 7, and Systems III to V.
   • Microsoft/SCO XENIX.
   • Berkeley releases from 1BSD to 4.4BSD.
   In addition, a large number of commercial Unix-related systems have been released by developers such as Apple, Digital Equipment Corporation, Hewlett-Packard, IBM, SCO, Silicon Graphics, and Sun Microsystems. Unix is available on a huge range of hardware, from a PC to a supercomputer. Several free (or almost free) versions of Unix are available in the Intel world, includingLinux,FreeBSD,andNetBSD;since they contain no proprietary code, they are not affected by licensing agreements other than the GNU General Public License. Unix today is a very different animal from the Unix of the 1980s. A typical system then consisted of a minicomputer serving a collection of dumb terminals. Unix today is more likely to be a graphical workstation on a network or a Web server on the Internet and is a large and complicated commercial offering, serving a wide range of applications.

Dictionary of networking . 2014.

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