Frontmatter -- Part I: The Linux Command Line. Starting with Linux Shells -- Getting to the Shell -- Basic bash Shell Commands -- More bash Shell Commands -- Understanding the Shell -- Using Linux Environment Variables -- Understanding Linux File Permissions -- Managing Filesystems -- Installing Software -- Working with Editors -- Part II: Shell Scripting Basics. Basic Script Building -- Using Structured Commands -- More Structured Commands -- Handling User Input -- Presenting Data -- Script Control -- Part III: Advanced Shell Scripting. Creating Functions -- Writing Scripts for Graphical Desktops -- Introducing sed and gawk -- Regular Expressions -- Advanced sed -- Advanced gawk -- Working with Alternative Shells -- Part IV: Creating Practical Scripts. Writing Simple Script Utilities -- Producing Scripts for Database, Web, and E-Mail -- Creating Fun Little Shell Scripts -- Appendix A: Quick Guide to bash Commands -- Appendix B: Quick Guide to sed and gawk.