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Should note that this is from (2011), guess it's not an issue as this is a testimonial which is timeless. Michael writes many *BSD flavored books, but my favorite book that every OpenSSH user should have is his "SSH Mastery" book.

http://www.amazon.com/SSH-Mastery-OpenSSH-PuTTY-Tunnels/dp/1...

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There is also Michael's "Sudo Mastery" book, and like his "SSH Mastery" book, it's full of useful lessons for just about anyone working with UNIX-based systems, including Linux and MacOS 10+.

Earlier this month, Michael gave a talk based on the "Sudo Mastery" book, titled "Sudo: You're Doing it Wrong":

https://www.youtube.com/watch?v=o0purspHg-o

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