I've been reading "Unix: A history and a memoir", in which Brian W Kernighan tells the story of how UNIX was developed at the Bell Labs in the 70s. I find it really fascinating!
There's quite some archived material! For example, here's a very early draft manual from 1971: https://www.tuhs.org/Archive/Distributions/Research/McIlroy_v0/UnixEditionZero-OCR.pdf
It already explains some concepts that, I think, were brand new at the time, but feel very familiar today: Device files, input/output redirection, a deep file system tree, background processes, ...
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