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    For those who don't know who Peter Salus is: amazon.com/Quarter-Century-UNIX-Peter-Salus/dp/0201547775 Commented Jan 12, 2011 at 17:02
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    Thanks for history. Please, check the web link of "proof". Thanks. Commented Aug 29, 2022 at 23:11
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    @CloudCho Yeah, it's been dead for a while, which is why I later quoted the text in my answer. Commented Aug 31, 2022 at 0:20
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    Indeed, and for further evidence you can go all the way back to the Research Unix V1 assembly source from 1972. It explicitly refers to /etc and the 'etcetra' directory (sic). Commented Sep 25, 2023 at 16:41