Unix turns 40: The past, present and future of the OS

Forty years ago this summer, a programmer sat down and knocked out in one month what would become one of the most important pieces of software ever created.
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In August 1969, Ken Thompson, a programmer at AT&T Bell Laboratories, saw the monthlong absence of his wife and young son as an opportunity to put his ideas for a new operating system into practice. He wrote the first version of Unix in assembly language for a wimpy Digital Equipment Corp. PDP-7 minicomputer, spending one week each on the operating system, a shell, an editor and an assembler.

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