I was wondering if the Unix Power Tools book, Third edition, is still relevant today? I want to order it but I am afraid it contains only outdated material.
If so, is there a recent similar book?
Absolutely. I find it useful for learning key concepts in Unix that may not be that obvious when you're first starting out.
When first starting out with Unix most of these are pretty foreign and a book like this is invaluable. I've had mine since the 2nd edition and it's pretty worn out at this point.
The 3rd edition is the latest one of this book it's circa 2002 but it's still completely relevant. Browse through the Amazon comments if you need more proof.