I was thinking more of ed, for some reason I thought folders were a later invention, 70's or early 80's, but they were first used in 1958: https://en.wikipedia

I was thinking more of ed, for some reason I thought folders were a later invention, 70's or early 80's, but they were first used in 1958: https://en.wikipedia.org/wiki/Directory_(computing) https://en.wikipedia.org/wiki/Directory_(computing)