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| Dedication | |
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| Acknowledgments | |
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| Introduction | |
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| Why Use the Command Line? | |
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| What This Book Is About | |
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| Who Should Read This Book | |
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| What's in This Book | |
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| How to Read This Book | |
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| Prerequisites; Learning the Shell | |
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| What Is the Shell? | |
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| Terminal Emulators | |
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| Your First Keystrokes | |
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| Try Some Simple Commands | |
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| Ending a Terminal Session | |
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| Navigation | |
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| Understanding the Filesystem Tree | |
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| The Current Working Directory | |
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| Listing the Contents of a Directory | |
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| Changing the Current Working Directory | |
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| Exploring the System | |
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| More Fun with ls | |
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| Determining a File's Type with file | |
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| Viewing File Contents with less | |
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| A Guided Tour | |
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| Symbolic Links | |
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| Manipulating Files and Directories | |
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| Wildcards | |
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| mkdir—Create Directories | |
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| cp—Copy Files and Directories | |
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| mv—Move and Rename Files | |
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| rm—Remove Files and Directories | |
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| ln—Create Links | |
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| Let's Build a Playground | |
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| Final Note | |
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| Working with Commands | |
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| What Exactly Are Commands? | |
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| Identifying Commands | |
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| Getting a Command's Documentation | |
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| Creating Your Own Commands with alias | |
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| Revisiting Old Friends | |
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| Redirection | |
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| Standard Input, Output, and Error | |
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| Pipelines | |
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| Final Note | |
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| Seeing the World as the Shell Sees It | |
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| Expansion | |
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| Quoting | |
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| Final Note | |
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| Advanced Keyboard Tricks | |
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| Command Line Editing | |
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| Completion | |
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| Using History | |
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| Final Note | |
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| Permissions | |
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| Owners, Group Members, and Everybody Else | |
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| Reading, Writing, and Executing | |
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| Changing Identities | |
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| Exercising Your Privileges | |
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| Changing Your Password | |
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| Processes | |
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| How a Process Works | |
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| Controlling Processes | |
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| Signals | |
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| More Process-Related Commands; Configuration and the Environment | |
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| The Environment | |
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| What Is Stored in the Environment? | |
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| How Is the Environment Established? | |
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| Modifying the Environment | |
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| Final Note | |
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| A Gentle Introduction to vi | |
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| Why We Should Learn vi | |
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| A Little Background | |
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| Starting and Stopping vi | |
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| Editing Modes | |
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| Moving the Cursor Around | |
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| Basic Editing | |
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| Search and Replace | |
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| Editing Multiple Files | |
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| Saving Our Work | |
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| Customizing the Prompt | |
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| Anatomy of a Prompt | |
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| Trying Some Alternative Prompt Designs | |
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| Adding Color | |
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| Moving the Cursor | |
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| Saving the Prompt | |
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| Final Note; Common Tasks and Essential Tools | |
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| Package Management | |
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| Packaging Systems | |
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| How a Package System Works | |
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| Common Package Management Tasks | |
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| Final Note | |
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| Storage Media | |
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| Mounting and Unmounting Storage Devices | |
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| Creating New Filesystems | |
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| Testing and Repairing Filesystems | |
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| Formatting Floppy Disks | |
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| Moving Data Directly to and from Devices | |
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| Creating CD-ROM Images | |
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| Writing CD-ROM Images | |
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| Extra Credit | |
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| Networking | |
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| Examining and Monitoring a Network | |
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| Transporting Files over a Network | |
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| Secure Communication with Remote Hosts | |
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| Searching for Files | |
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| locate—Find Files the Easy Way | |
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| find—Find Files the Hard Way | |
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| Archiving and Backup | |
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| Compressing Files | |
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| Archiving Files | |
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| Synchronizing Files and Directories | |
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| Regular Expressions | |
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| What Are Regular Expressions? | |
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| grep—Search Through Text | |
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| Metacharacters and Literals | |
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| The Any Character | |
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| Anchors | |
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| Bracket Expressions and Character Classes | |
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| POSIX Basic vs. Extended Regular Expressions | |
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| Alternation | |
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| Quantifiers | |
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| Putting Regular Expressions to Work | |
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| Final Note | |
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| Text Processing | |
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| Applications of Text | |
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| Revisiting Some Old Friends | |
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| Slicing and Dicing | |
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| Comparing Text | |
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| Editing on the Fly | |
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| Final Note | |
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| Extra Credit | |
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| Formatting Output | |
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| Simple Formatting Tools | |
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| Document Formatting Systems | |
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| Final Note | |
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| Printing | |
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| A Brief History of Printing | |
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| Printing with Linux | |
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| Preparing Files for Printing | |
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| Sending a Print Job to a Printer | |
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| Monitoring and Controlling Print Jobs | |
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| Compiling Programs | |
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| What Is Compiling? | |
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| Compiling a C Program | |
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| Final Note; Writing Shell Scripts | |
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| Writing Your First Script | |
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| What Are Shell Scripts? | |
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| How to Write a Shell Script | |
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| More Formatting Tricks | |
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| Final Note | |
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| Starting a Project | |
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| First Stage: Minimal Document | |
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| Second Stage: Adding a Little Data | |
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| Variables and Constants | |
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| Here Documents | |
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| Final Note | |
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| Top-Down Design | |
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| Shell Functions | |
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| Local Variables | |
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| Keep Scripts Running | |
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| Final Note | |
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| Flow Control: Branching with if | |
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| Using if | |
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| Exit Status | |
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| Using test | |
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| A More Modern Version of test | |
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| (( ))—Designed for Integers | |
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| Combining Expressions | |
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| Control Operators: Another Way to Branch | |
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| Final Note | |
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| Reading Keyboard Input | |
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| read—Read Values from Standard Input | |
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| Validating Input | |
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| Menus | |
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| Final Note | |
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| Extra Credit | |
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| Flow Control: Looping with while and until | |
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| Looping | |
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| while | |
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| Breaking out of a Loop | |
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| until | |
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| Reading Files with Loops | |
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| Final Note | |
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| Troubleshooting | |
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| Syntactic Errors | |
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| Logical Errors | |
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| Testing | |
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| Debugging | |
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| Final Note | |
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| Flow Control: Branching with case | |
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| case | |
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| Final Note | |
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| Positional Parameters | |
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| Accessing the Command Line | |
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| Handling Positional Parameters En Masse | |
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| A More Complete Application | |
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| Final Note | |
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| Flow Control: Looping with for | |
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| for: Traditional Shell Form | |
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| for: C Language Form | |
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| Final Note | |
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| Strings and Numbers | |
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| Parameter Expansion | |
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| Arithmetic Evaluation and Expansion | |
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| bc—An Arbitrary-Precision Calculator Language | |
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| Final Note | |
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| Extra Credit | |
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| Arrays | |
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| What Are Arrays? | |
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| Creating an Array | |
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| Assigning Values to an Array | |
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| Accessing Array Elements | |
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| Array Operations | |
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| Final Note | |
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| Exotica | |
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| Group Commands and Subshells | |
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| Traps | |
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| Asynchronous Execution | |
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| Named Pipes | |
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| Final Note | |
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| Colophon | |
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| Updates | |