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Linux Essentials

Linux Essentials - Second Edition

By : Christine Bresnahan, Richard Blum
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Linux Essentials

Linux Essentials

By: Christine Bresnahan, Richard Blum

Overview of this book

Linux Essentials, Second Edition provides a solid foundation of knowledge for anyone considering a career in information technology, for anyone new to the Linux operating system, and for anyone who is preparing to sit for the Linux Essentials Exam. Through this engaging resource, you can access key information in a learning-by-doing style. Hands-on tutorials and end-of-chapter exercises and review questions lead you in both learning and applying new information—information that will help you achieve your goals! With the experience provided in this compelling reference, you can sit down for the Linux Essentials Exam with confidence. An open-source operating system, Linux is a UNIX-based platform that is freely updated by developers. The nature of its development means that Linux is a low-cost and secure alternative to other operating systems, and is used in many different IT environments. Passing the Linux Essentials Exam prepares you to apply your knowledge regarding this operating system within the workforce.
Table of Contents (19 chapters)
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1
INTRODUCTION
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INTRODUCTION
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What Is Linux?
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What Is the Linux Essentials Certification?
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Who Should Read This Book?
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How This Book Is Organized
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Conventions Used in This Book
2
CHAPTER 1: Selecting an Operating System
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CHAPTER 1: Selecting an Operating System
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What Is an OS?
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Investigating User Interfaces
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Where Does Linux Fit in the OS World?
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What Is a Distribution?
3
CHAPTER 2: Understanding Software Licensing
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CHAPTER 2: Understanding Software Licensing
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Investigating Software Licenses
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Looking at the Free Software Foundation
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Looking at the Open Source Initiative
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Looking at the Creative Commons
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Using Open Source Licenses
4
CHAPTER 3: Investigating Linux’s Principles and Philosophy
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CHAPTER 3: Investigating Linux’s Principles and Philosophy
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Exploring Linux through the Ages
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Using Open Source Software
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Understanding OS Roles
5
CHAPTER 4: Using Common Linux Programs
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CHAPTER 4: Using Common Linux Programs
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Using a Linux Desktop Environment
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Working with Productivity Software
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Using Server Programs
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Managing Programming Languages
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Handling Software Packages
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CHAPTER 5: Managing Hardware
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CHAPTER 5: Managing Hardware
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Learning about Your CPU
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Identifying Motherboard Capabilities
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Sizing Your Power Supply
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Understanding Disk Issues
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Managing Displays
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Handling USB Devices
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Managing Drivers
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CHAPTER 6: Getting to Know the Command Line
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CHAPTER 6: Getting to Know the Command Line
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Starting a Command Line
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Running Programs
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Using Shell Features
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Getting Help Using man Pages
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Getting Help Using info Pages
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Finding Additional Documentation
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CHAPTER 7: Managing Files
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CHAPTER 7: Managing Files
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Understanding Where Things Go
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Navigating Files and Directories
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Manipulating Files
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Manipulating Directories
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CHAPTER 8: Searching, Extracting, and Archiving Data
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CHAPTER 8: Searching, Extracting, and Archiving Data
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Using Regular Expressions
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Searching for and Extracting Data
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Redirecting Input and Output
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Archiving Data
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CHAPTER 9: Exploring Processes and Process Data
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CHAPTER 9: Exploring Processes and Process Data
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Understanding Package Management
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Understanding the Process Hierarchy
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Identifying Running Processes
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Using Log Files
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CHAPTER 10: Editing Files
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CHAPTER 10: Editing Files
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Understanding the Role of Text Files
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Choosing an Editor
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Launching an Editor
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Editing Files with pico or nano
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Editing Files with vi
12
CHAPTER 11: Creating Scripts
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CHAPTER 11: Creating Scripts
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Beginning a Shell Script
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Using Commands
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Using Arguments
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Using Variables
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Using Conditional Expressions
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Using Loops
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Using Functions
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Setting the Script’s Exit Value
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CHAPTER 12: Understanding Basic Security
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CHAPTER 12: Understanding Basic Security
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Understanding Accounts
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Using Account Tools
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Working as root
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CHAPTER 13: Creating Users and Groups
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CHAPTER 13: Creating Users and Groups
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Creating New Accounts
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Modifying Accounts
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Deleting Accounts
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Managing Groups
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CHAPTER 14: Setting Ownership and Permissions
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CHAPTER 14: Setting Ownership and Permissions
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Setting Ownership
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Setting Permissions
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Using Special Permission Bits and File Features
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CHAPTER 15: Managing Network Connections
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CHAPTER 15: Managing Network Connections
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Understanding Network Features
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Configuring a Network Connection
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Testing Your Network Connection
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Protecting Your System from the Bad Guys
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EULA
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EULA
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APPENDIX A: Answers to Review Questions
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APPENDIX A: Answers to Review Questions
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Chapter 1
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Chapter 2
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Chapter 3
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Chapter 4
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Chapter 5
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Chapter 6
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Chapter 7
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Chapter 8
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Chapter 9
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Chapter 10
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Chapter 11
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Chapter 12
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Chapter 13
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Chapter 14
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Chapter 15
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APPENDIX B: LPI’s Certification Program
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APPENDIX B: LPI’s Certification Program
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The Linux Essentials Certification
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Certification Objectives Map

Chapter 11

  1. A Scripts, like binary programs, normally have at least one executable bit set, although they can be run in certain ways without this feature, so option A is correct. There is no standard /usr/bin/scripts directory, and scripts can reside in any directory, so option B is incorrect. Scripts are interpreted programs, which means that they don’t need to be compiled. Typing bash scriptname will run the script; option C is incorrect. Viruses are extremely rare in Linux, and because you just created the script, the only ways in which it could possibly contain a virus would be if your system was already infected or if you wrote it as a virus. Thus option D is incorrect. Most spell checkers are intended for English or other human languages, so they lack valid Bash commands such as esac. Furthermore, even if every keyword is spelled correctly, the script could contain bugs. Thus option E is incorrect.
  2. C The cp command is the only one called in the script, and that command copies...
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Tech Concepts
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Programming languages
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Linux Essentials
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