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by jjice 731 days ago
Depends on if you mean Linux internals, or working with Linux in general. In the case of the latter, I really liked "Unix and Linux System Administration Handbook". It's a monster sitting at just under 1200 pages (for the fifth edition) and covers a bit of everything from a user of a Unix OS's perspective. The way the chapters are broken out, you can pick and choose what you care about.

The modern editions of this book are primarily focused on Linux with some side notes for the BSDs.