William Rothwell - Linux Essentials for Cybersecurity

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William Bo Rothwell
Denise Kinsey

Linux Essentials for Cybersecurity

Copyright 2019 by Pearson Education, Inc.

All rights reserved. No part of this book shall be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without written permission from the publisher. No patent liability is assumed with respect to the use of the information contained herein. Although every precaution has been taken in the preparation of this book, the publisher and author assume no responsibility for errors or omissions. Nor is any liability assumed for damages resulting from the use of the information contained herein.

ISBN-13: 978-0-7897-5935-1

ISBN-10: 0-7897-5935-7

Library of Congress Control Number: 2018941152

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William Bo Rothwell At the impressionable age of 14, William Bo Rothwell crossed paths with a TRS-80 Micro Computer System (affectionately known as a Trash 80). Soon after the adults responsible for Bo made the mistake of leaving him alone with the TRS-80, he immediately dismantled it and held his first computer class, showing his friends what made this computer thing work.

Since this experience, Bos passion for understanding how computers work and sharing this knowledge with others has resulted in a rewarding career in IT training. His experience includes Linux, Unix, and programming languages such as Perl, Python, Tcl, and BASH. He is the founder and president of One Course Source, an IT training organization.

Denise Kinsey, Ph.D, CISSP, CISCO Dr. Denise Kinsey served as a Unix administrator (HP-UX) in the late 1990s and realized the power and flexibility of the operating system. This appreciation led to her home installation of different flavors of Linux and creation of several academic courses in Linux. With a strong background in cybersecurity, she works to share and implement best practices with her customers and students. Dr. Kinsey is an assistant professor at the University of Houston.

For the last three books, I have thanked my wife and daughter for their patience, and my parents for all that they have done throughout my life. My gratitude continues, as always.

William Bo Rothwell

May 2018

This book is dedicated to

My family, who inspire and encourage me

My students, whom I work to inspire and who inspire me

Those who are interested in Linux and/or cybersecurity. I hope you find the information useful, valuable, and easily applicable.

Denise Kinsey

Thanks to everyone who has put in a direct effort toward making this book a success:

• Denise, my co-author, for her extremely valuable insight and for dealing with the chaos around my creative process.

• Mary Beth, for putting her trust in me for yet another book.

• Eleanor and Mandie, for keeping me on track (with very gentle reminders) and all of the hard work and dedication.

• Casey and Andrew, for excellent feedback and for proving four brains are better than two.

• Bart Reed, for painsteakingly painstakingly reviewing every word, sentence, graphic, table, and punctuation character.

• And all the other folks at Pearson who have had an impact on this book.

I have always felt that I was fortunate because I had strong technical skills combined with the ability to impart my knowledge to others. This has allowed me to be an IT corporate instructor and courseware developer for almost 25 years now. It is the experiences I have had teaching others that have put me in a position to write a book like this. So, I would also like to acknowledge the following people:

• All of the students who have listened to me for countless hours (I have no idea how you do this). I teach to see the light bulbs go on in your heads. You have taught me patience and given me an understanding that everyone needs to start from some place. Thanks for making me a part of your journey.

• All of the excellent instructors I have observed. There have been so many of them, it would be impossible to list them all here. Im a much better knowledge facilitator because of what I have learned from you.

• Lastly, I have no way to express my gratitude toward people like Linus Torvalds. Without pioneers like Linus (who is one of a great many), so much of the technology we now take for granted just wouldnt exist. These folks have given us all the opportunity to learn tools that we can use to make even more great inventions. I urge you to not think of Linux as just an operating system, but rather as a building block that allows you and others to create even more amazing things.