How a discarded operating system, salvaged from the wreckage of Multics on a spare PDP-7 at Bell Labs in 1969, became the common ancestor of nearly every computer that matters today — through a fateful rewrite in C, an antitrust decree that gave it away cheap, two decades of lawsuits and fragmentation, and a free kernel that arrived just in time to inherit the world.
Posix
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The Story of Unix