"The number of UNIX installations has grown to 10. with more expexted."
(The UNIX programmer's Manual,2nd Edition, june 1972)
The UNIX operating system started on cast-off DEC PDP-7 at Bell Laboratories in 1969. Ken Thompson,with idens and support from Rudd Canaday, Doug Mcllroy, Joe Ossanna, and Dennis Ritchie, wrote a small general-purpose time-sharing system comfortable enough to attract enthusiastic users and eventually enough credibility for the purchase of a larger machine -- a PDP-11/20. One of the early users was Ritchie, who helped move the system to the PDP-11 in 1970. Ritchie also designed and wrote a compiler for the C Programming Language. in 1973,Ritchie and Thompson rewrote the UNIX kernel in C,breaking from the tradition that tradition that system software is written in assembly language. With that rewrite, the System became assentially what it is today.
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