I think you’re missing a lot of metadata (last modified, history?) in those files. Haven’t checked in a while, though.

Definitely Ultima, but possibly branching off from 7.

Back in the day I did enjoy the O’Reilly Linux Administrator guide(s?). I don’t know whether they have been updated, so they might be a little dated in parts - but the writing was highly enjoyable.

Just very quickly: the books are so much better than the show! I had to stop watching the show somewhere I think in season 2 - everything started digressing/simplifying too much from the books (the characters became flat and uninteresting etc.) So yeah, I found the books much more enjoyable.