Linux Command Line and Shell Scripting Bible 2nd edition potx

www.it-ebooks.info www.it-ebooks.info www.it-ebooks.info Table of Contents Title Page Copyright Dedication Credits About the Authors About the Technical Editor Acknowledgments Introduction Who Should Read This Book How This Book Is Organized Minimum Requirements Where to Go from Here Part I: The Linux Command Line Chapter 1: Starting with Linux Shells What Is Linux? Linux Distributions Summary Chapter 2: Getting to the Shell Terminal Emulation The terminfo Database The Linux Console The xterm Terminal The Konsole Terminal The GNOME Terminal Summary www.it-ebooks.info Chapter 3: Basic bash Shell Commands Starting the Shell The Shell Prompt The bash Manual Filesystem Navigation File and Directory Listing File Handling Directory Handling Viewing File Contents Summary Chapter 4: More bash Shell Commands Monitoring Programs Monitoring Disk Space Working with Data Files Summary Chapter 5: Using Linux Environment Variables What Are Environment Variables? Setting Environment Variables Removing Environment Variables Default Shell Environment Variables Setting the PATH Environment Variable Locating System Environment Variables Variable Arrays Using Command Aliases Summary Chapter 6: Understanding Linux File Permissions Linux Security Using Linux Groups Decoding File Permissions Changing Security Settings Sharing Files Summary Chapter 7: Managing Filesystems Exploring Linux Filesystems Working with Filesystems Logical Volume Managers Summary www.it-ebooks.info Chapter 8: Installing Software Package Management Primer The Debian-Based Systems The Red Hat–Based Systems Installing from Source Code Summary Chapter 9: Working with Editors The vim Editor The emacs Editor The KDE Family of Editors The GNOME Editor Summary Part II: Shell Scripting Basics Chapter 10: Basic Script Building Using Multiple Commands Creating a Script File Displaying Messages Using Variables Redirecting Input and Output Pipes Performing Math Exiting the Script Summary Chapter 11: Using Structured Commands Working with the if-then Statement The if-then-else Statement Nesting ifs The test Command Compound Condition Testing Advanced if-then Features The case Command Summary Chapter 12: More Structured Commands The for Command The C-Style for Command www.it-ebooks.info The while Command The until Command Nesting Loops Looping on File Data Controlling the Loop Processing the Output of a Loop Summary Chapter 13: Handling User Input Command Line Parameters Special Parameter Variables Being Shifty Working with Options Standardizing Options Getting User Input Summary Chapter 14: Presenting Data Understanding Input and Output Redirecting Output in Scripts Redirecting Input in Scripts Creating Your Own Redirection Listing Open File Descriptors Suppressing Command Output Using Temporary Files Logging Messages Summary Chapter 15: Script Control Handling Signals Running Scripts in Background Mode Running Scripts Without a Console Job Control Being Nice Running Like Clockwork Summary Part III: Advanced Shell Scripting Chapter 16: Creating Functions Basic Script Functions www.it-ebooks.info Returning a Value Using Variables in Functions Array Variables and Functions Function Recursion Creating a Library Using Functions on the Command Line Summary Chapter 17: Writing Scripts for Graphical Desktops Creating Text Menus Doing Windows Getting Graphic Summary Chapter 18: Introducing sed and gawk Text Manipulation The sed Editor Basics Summary Chapter 19: Regular Expressions What Are Regular Expressions? Defining BRE Patterns Extended Regular Expressions Regular Expressions in Action Summary Chapter 20: Advanced sed Multiline Commands The Hold Space Negating a Command Changing the Flow Pattern Replacement Using sed in Scripts Creating sed Utilities Summary Chapter 21: Advanced gawk Using Variables Working with Arrays Using Patterns Structured Commands www.it-ebooks.info Formatted Printing Built-in Functions User-Defined Functions Summary Chapter 22: Working with Alternative Shells What Is the dash Shell? The dash Shell Features Scripting in dash The zsh Shell Parts of the zsh Shell Scripting with zsh Summary Part IV: Advanced Shell Scripting Topics Chapter 23: Using a Database The MySQL Database The PostgreSQL Database Working with Tables Using the Database in Your Scripts Summary Chapter 24: Using the Web The Lynx Program The cURL Program Networking with zsh Summary Chapter 25: Using E-mail The Basics of Linux E-Mail Setting Up Your Server Sending a Message with Mailx The Mutt Program Summary Chapter 26: Writing Script Utilities Monitoring Disk Space Performing Backups Managing User Accounts www.it-ebooks.info Summary Chapter 27: Advanced Shell Scripts Monitoring System Statistics Problem-Tracking Database Summary Appendix A: Quick Guide to bash Commands Built-in Commands bash Commands Environment Variables Appendix B: Quick Guide to sed and gawk The sed Editor The gawk Program Index www.it-ebooks.info [...]... with Linux Shells In this Chapter What is Linux? Parts of the Linux kernel Exploring the Linux desktop Visiting Linux distributions Before you can dive into working with the Linux command line and shells, it's a good idea to first understand what Linux is, where it came from, and how it works This chapter walks you through what Linux is, and explains where the shell and command line fit in the overall Linux. .. Minimum Requirements Linux Command Line and Shell Scripting Bible doesn't focus on any specific Linux distribution, so you'll be able to follow along in the book using any Linux system you have available The bulk of the book references the bash shell, which is the default shell for most Linux systems Where to Go from Here Once you've completed Linux Command Line and Shell Scripting Bible, you'll be well... tutorials and real-world information, as well as reference and background information that provides a context for what you are learning This book is a fairly comprehensive resource on the Linux command line and shell commands By the time you have completed Linux Command Line and Shell Scripting Bible you will be well prepared to write your own shell scripts that can automate practically any task on your Linux. .. the Linux command line prompt and what to do once you get there Often performing simple tasks, such as file management, can be done more quickly from the command line than from a fancy graphical interface There's a wealth of commands you can use from the command line, and this book shows you how to use them How This Book Is Organized This book leads you through the basics of the Linux command line and. .. to access the shell (Chapter 2) Introducing the basic shell commands (Chapter 3) Using more advanced shell commands to peek at system information (Chapter 4) Working with shell variables to manipulate data (Chapter 5) Understanding the Linux filesystem and security (Chapter 6) Working with Linux filesystems from the command line (Chapter 7) Installing and updating software from the command line (Chapter... sites, such as Slashdot and Distrowatch, that provide up-to-the-minute information about new advances in Linux www.it-ebooks.info Part I The Linux Command Line In This Part Chapter 1: Starting with Linux Shells Chapter 2: Getting to the Shell Chapter 3: Basic bash Shell Commands Chapter 4: More bash Shell Commands Chapter 5: Using Linux Environment Variables Chapter 6: Understanding Linux File Permissions... Shell The GNU /Linux shell is a special interactive utility It provides a way for users to start programs, manage files on the filesystem, and manage processes running on the Linux system The core of the shell is the command prompt The command prompt is the interactive part of the shell It allows you to enter text commands, and then it interprets the commands and then executes them in the kernel The shell. .. files are called shell scripts Any command that you can execute from the command line can be placed in a shell script and run as a group of commands This provides great flexibility in creating utilities for commonly run commands, or processes that require several commands grouped together www.it-ebooks.info There are quite a few Linux shells available to use on a Linux system Different shells have different... published numerous Linux and open source books He has administered UNIX, Linux, Novell, and Microsoft servers, as well as helped design and maintain a 3,500 user network utilizing Cisco switches and routers He has used Linux servers and shell scripts to perform automated network monitoring, and has written shell scripts in most of the common Linux shell environments Rich is an online instructor for... opportunity for us, and for helping us out in our writing careers Christine would like to thank her husband, Timothy, for his encouragement, patience, and willingness to listen, even when he has no idea what she is talking about www.it-ebooks.info Introduction Welcome to the second edition of Linux Command Line and Shell Scripting Bible Like all books in the Bible series, you can expect to find both hands-on tutorials . The Linux Command Line Chapter 1: Starting with Linux Shells What Is Linux? Linux Distributions Summary Chapter 2: Getting to the Shell Terminal Emulation The terminfo Database The Linux. Command Summary Chapter 12: More Structured Commands The for Command The C-Style for Command www.it-ebooks.info The while Command The until Command Nesting Loops Looping on File Data Controlling. sed and gawk The sed Editor The gawk Program Index www.it-ebooks.info www.it-ebooks.info www.it-ebooks.info www.it-ebooks.info Linux ® Command Line and Shell Scripting Bible, Second Edition