Yes back when there were a few good books that were the references for tech subjects. No Google, no Stack Overflow, no "For Dummies" waste of paper.

I'm currently reading and it feels like I'm learning a lot but at the same time it shows that a lot has changed since then.

I would love similar book but relevsnt for the current systems...

I imagine that would be hard because the scope is so much larger today

Agreed, this is an excellent book. I would definitely recommend it even today to people that want to improve their understand of unix/linux.