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 sy....

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