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There's also the great "The Design of the UNIX Operating System":

https://www.amazon.com/Design-UNIX-Operating-System/dp/01320...

Which is probably less relevant today in terms of directly understanding the implementation. But an interesting and enlightening read. Things were much simpler and fundamental back in the 1980s. It's easier to understand that way. Then layer on top.




Slightly more recent: The Design and Implementation of the 4.4 BSD Operating System, which includes some of the Berkeley additions to the kernel, such as TCP/IP and sockets.

And then there's xv6 [1], a small Unix running on vx32 from MIT for teaching purposes, full of comments, and available as a booklet that is directly inspired by Lions' commentary on the 6th edition of Unix.

I actually agree, though: to really appreciate the classics you should start with (Maurice) Bach. :-P

[1] https://pdos.csail.mit.edu/6.828/2018/xv6.html


Correction: xv6 runs on QEMU, not vx32 (although Russ Cox co-authored both xv6 and vx32).




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