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@TejasKumar_ @kentcdodds I checked Kernighan’s book “The UNIX Progming Environment” (from 1984, he’s one of the creators of Unix) and it looks like it’s short for “user file system:” archive.org/details/unixprogramminge0000kern/page/64/mode/2up
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@TejasKumar_ @kentcdodds On the next page he says “/usr is called the ‘user file system,’ although it may have little to do with the actual users of the system. On our machine, our login directories are /usr/bwk and /usr/rob, but on your machine the /usr part might be different”