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I recommend (by most expensive, to free):

Marshall Kirk McKusick's FreeBSD Intensive Code Walkthrough: https://www.mckusick.com/courses/advdescrip.html

Also, The Design and Implementation of the FreeBSD Operating System (2nd Edition): https://www.amazon.com/Design-Implementation-FreeBSD-Operati...

Thirdly: grab a copy of FreeBSD (or OpenBSD) and (a) set it up in VirtualBox and SSH it into locally (b) use an old ThinkPad. Then grab the source code of the base system. Build and install it. And start reading code of things like usr.bin/grep/grep.c




I have't done the code walkthrough course, but I bought and watched Kirk McKusick's Kernel Internals course and it is excellent (https://www.mckusick.com/courses/introdescrip.html). It is based around FreeBSD, but is a generic enough Unix internals course that it is good for Linux.

I'm thankful to have the opportunity to learn from someone with such deep knowledge of Unix, who was involved with BSD from the early days in the 80s to modern FreeBSD.




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