Many readers will be familiar with the UNIX operating system. Its growth and spread is perhaps one of the most unexpected success stories of computing. Originally implemented on an abandoned PDP-7 minicomputer in 1969 by Ken Thompson, (later joined by Dennis Ritchie), the system is now in widespread use in educational establishments and there are many UNIX look-alikes in the industrial marketplace. SunOS is based on 4.2 BSD UNIX, developed at the University of California, Berkeley, and System V UNIX, developed by AT&T. You may often hear the terms UNIX and SunOS used interchangeably when reference is made to the Sun operating system.
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