1973–1979
This period became the most significant in the development of UNIX. Ritchie and Thompson had developed the C programming language between 1969 and 1973 and now rewrote the UNIX kernel in the high-level C language. The operating system could be compiled to run on different computers. Within months, UNIX could be ported to new hardware. Modifications to the operating system were easy. Again, Thompson resonated with members of the academic community who were already using UNIX in many of their system-design courses. UNIX, written in a general-purpose language featuring modern commands, began to take off in the areas of word processing and programming.
By this point, UNIX was at version 6. This was the first release of UNIX to be picked ...
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