Not a layered manual product from DEC, but Bernd Ulmann – a man who loves old hardware.
Bernd also shares my fascination for SAGE and the AN/FSQ7 (he even wrote the book on it – if anyone’s feeling generous…
Better Bash Scripting in 15 Minutes
I haven’t tried how much of this also works in zsh, I’m guessing a lot. Some really good stuff here.