Yeah and ESR can be revisionist in his history, projecting intention on something organic. He alienated a lot of people over time with this… and other behavior.

The book I recommended is both a handbook and a “how to think.” It applies forward to things introduced well after the book. But it also helped me understand why the Byzantine behavior of a tty is what it is.

If you are interested in the history from a first person perspective, I do recommend Kernighan’s “Unix: A History and a Memoir”. He went from originally trying to write something objective to realizing it was necessarily his personal experience. Even the culture aspect of his story has influenced how I try to foster teamwork. It was an engaging read for me.