I use TLPI as an optional text for my CS Operating Systems course! It's honestly the best resource for a comprehensive look at the innards of Linux. I actually even snip select pages for lectures.

One of the greatest texts ever written. Ok maybe just one of my favorites. I wouldn't mind a 2nd edition though... surely the system call interface has changed a bit since 2010.

We did not get as recommend or required reading in a course. But the professor did recommend it to me outside of class.

What a horrible selection for a university textbook! It doesn't get trivially updated every year to prevent reuse and reselling, so how is this supposed to generate more profit for the booksellers? /s

Seriously though, this book is fantastic, and far better than typical course textbooks. I'm honestly a little surprised that universities would select it.