"This excellent Linux command line book is more than cubicle decoration, it's a secret super power."
—Ken Hess, Red Hat.
"For those looking to master the Linux command line and get an essential understand of the core Linux command line tools, this book is a highly effective and useful guide."
—Ben Rothke, RSA Conference
"I can honestly say I have found THE beginner's guide to Linux."
—Jayson Broughton, Linux Journal
"This is exactly what a Linux beginner needs to get up to speed quickly. The book goes beyond simply walking through all of the command line utilities, and ventures into the realm of theory and how things work together."
—Nicholas C. Zakas, Yahoo!
"Anyone who reads this book and makes use of the examples provided will not be able to avoid becoming a Unix command line pro by the time they've hit the end of the book. It provides an excellent introduction to the command line that takes students from knowing nearly nothing to using impressively sophisticated commands."
—Sandra Henry-Stocker, ITworld
"The most approachable tome on the subject."
—Federico Lucifredi, Linux Magazine
"If you would like to start using the command line, improve your existing skills, or simply want to discover tools that you were never even aware existed, this book has everything you need, and I wholly recommend it."
—Phil Bull, author of the official Ubuntu documentation
"This is the best introduction to the command-line I have read."
"A perfect companion to more remedial guides to Linux that touch on the command only briefly, and also a terrific bridge to deeper technical programming books. Highly recommended."
"The Linux Command Line is pleasant to read. It has a light tone, while also getting down to business."
—John D. Cook, The Endeavor
"A delightful read and you can hand it to a junior colleague or friend with more limited Unix shell exposure and be confident that they come back significantly shell-wiser and probably happier."
—Peter N.M. Hansteen, That Grumpy BSD Guy
"If you're a novice Linux player, or just want to get beyond the pretty graphical wrapper of your MacBook, put this book at the top of your list."
—Michael Larsen, TESTHEAD
"I give this book to all my interns on day one. I find this to be an incredibly indispensable resource for teaching not only the basics of the Linux command line, but also anybody looking to get into information security. It's wildly comprehensive without being overwhelming. It does a great job of introducing a basic command, showing you all of the options on how to use the command, and a lot of examples and practical stories to back them up."
—Matt Barnett, Chief Strategist and CoFounder, SEVN-X
"A great way to learn some tips on working with those HUGE log files that are critical to cyber defense."
—Mark Jeanmougin, @markjx01