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Where Did UNIX Come From and Why Are There Different Versions Of UNIX?


The first efforts at developing a multi-user, multi-tasking operating system
were begun in the 1960's in a development project called MULTICS. While working
for Bell Telephone Laboratories in 1969 and 1970, Ken Thompson and Dennis
Ritchie began to develop their own single-user, multi-tasking small operating
system and they chose the name UNIX. Their initial goal was simply to operate
their DEC PDP machines more effectively. In 1971, UNIX became multi-user and
multi-tasking, but it was still just being developed by a small group of
programmers who were trying to take advantage of the machines they had at hand.
(In other words, this operating system that they were developing did not run on
any machine made by Bell!)

In 1973, Dennis Ritchie rewrote the UNIX operating system in C (a language he
had developed.) And in 1975, the portability of the C programming language was
used to "port" UNIX to a wide variety of......

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Approximate Word Count: 286
Approximate Pages: 2 (250 words per double-spaced page)

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