Shell Scripting: Expert Recipes for Linux, Bash, and More -- Contents at a Glance -- Dedication -- About the Author -- About the Technical Editor -- Credits -- Acknowledgments -- Contents -- Introduction -- What This Book Covers -- How This Book Is Structured -- What You Need to Use This Book -- Conventions -- Source Code -- Errata -- p2p.wrox.com -- Part I: About the Ingredients -- Chapter 1: The History of Unix, GNU, and Linux -- Unix -- "Everything Is a File" and Pipelines -- BSD -- GNU -- Linux -- Summary -- Chapter 2: Getting Started -- Choosing an OS -- GNU/Linux -- The BSDs -- Proprietary Unix -- Microsoft Windows -- Choosing an Editor -- Graphical Text Editors -- Terminal Emulation -- Nongraphical Text Editors -- Setting Up the Environment -- The Shell Profile -- Aliases -- Vim Settings -- Summary -- Chapter 3: Variables -- Using Variables -- Typing -- Assigning Values to Variables -- Positional Parameters -- Return Codes -- Unsetting Variables -- Preset and Standard Variables -- BASH_ENV -- BASHOPTS -- SHELLOPTS -- BASH_COMMAND -- BASH_SOURCE, FUNCNAME, LINENO and BASH_LINENO -- SHELL -- HOSTNAME and HOSTTYPE -- Working Directory -- PIPESTATUS -- TIMEFORMAT -- PPID -- RANDOM -- REPLY -- SECONDS -- BASH_XTRACEFD -- GLOBIGNORE -- HOME -- IFS -- PATH -- TMOUT -- TMPDIR -- User Identification Variables -- Summary -- Chapter 4: Wildcard Expansion -- Filename Expansion (Globbing) -- Bash Globbing Features -- Shell Options -- Regular Expressions and Quoting -- Overview of Regular Expressions -- Quoting -- Summary -- Chapter 5: Conditional Execution -- If/Then -- Else -- elif -- Test ([) -- Flags for Test -- File Comparison Tests -- String Comparison Tests -- Regular Expression Tests -- Numerical Tests -- Combining Tests -- Case -- Summary -- Chapter 6: Flow Control Using Loops -- For Loops -- When to Use For Loops.

Imaginative Ways of Feeding "For" with Data -- C-Style For Loops -- While Loops -- When to Use While Loops -- Ways to Use While Loops -- Nested Loops -- Breaking and Continuing Loop Execution -- While with Case -- Until Loops -- Select Loops -- Summary -- Chapter 7: Variables Continued -- Using Variables -- Variable Types -- Length of Variables -- Special String Operators -- Stripping Variable Strings by Length -- Stripping from the End of the String -- Stripping Strings with Patterns -- Searching Strings -- Using Search and Replace -- Replacing Patterns -- Deleting Patterns -- Changing Case -- Providing Default Values -- Indirection -- Sourcing Variables -- Summary -- Chapter 8: Functions and Libraries -- Functions -- Defining Functions -- Function Output -- Writing to a File -- Redirecting the Output of an Entire Function -- Functions with Trap -- Recursive Functions -- Variable Scope -- Libraries -- Creating and Accessing Libraries -- Library Structures -- Network Configuration Library -- Use of Libraries -- Getopts -- Handling Errors -- Getopts within Functions -- Summary -- Chapter 9: Arrays -- Assigning Arrays -- One at a Time -- All at Once -- By Index -- All at Once from a Source -- Read from Input -- Accessing Arrays -- Accessing by Index -- Length of Arrays -- Accessing by Variable Index -- Selecting Items from an Array -- Displaying the Entire Array -- Associative Arrays -- Manipulating Arrays -- Copying an Array -- Appending to an Array -- Deleting from an Array -- Advanced Techniques -- Summary -- Chapter 10: Processes -- The ps Command -- ps Line Length -- Parsing the Process Table Accurately -- killall -- The /proc pseudo-filesystem -- prtstat -- I/O Redirection -- Appending Output to an Existing File -- Permissions on Redirections -- Exec -- Using exec to Replace the Existing Program -- Using exec to Change Redirection -- Pipelines.

Background Processing -- Wait -- Catching Hangups with nohup -- Other Features of /proc and /sys -- Version -- SysRq -- /proc/meminfo -- /proc/cpuinfo -- /sys -- /sys/devices/system/node -- Sysctl -- Summary -- Chapter 11: Choosing and Using Shells -- The Bourne Shell -- The KornShell -- The C Shell -- The Tenex C Shell -- The Z Shell -- The Bourne Again Shell -- The Debian Almquist Shell -- Dotfiles -- Interactive Login Shells -- Interactive Non-Login Shells -- Non-Interactive Shells -- Logout Scripts -- Command Prompts -- The PS1 Prompt -- The PS2, PS3, and PS4 Prompts -- Aliases -- Timesavers -- Modifying Behaviors -- History -- Recalling Commands -- Searching History -- Timestamps -- Tab Completion -- ksh -- tcsh -- zsh -- bash -- Foreground, Background, and Job Control -- Backgrounding Processes -- Job Control -- nohup and disown -- Summary -- Part II: Recipes for Using and Extending System Tools -- Chapter 12: File Manipulation -- stat -- cat -- Numbering Lines -- Dealing with Blank Lines -- Non-Printing Characters -- cat Backwards is tac -- Redirection -- Redirecting Output: The Single Greater-Than Arrow (>) -- Appending: The Double Greater-Than Arrow (>>) -- Input Redirection: The Single Less-Than Arrow (<) -- Here Documents: The Double Less-Than Arrow (<< EOF) -- dd -- df -- mktemp -- join -- install -- grep -- grep Flags -- grep Regular Expressions -- split -- tee -- touch -- find -- find -exec -- Summary -- Chapter 13: Text Manipulation -- cut -- echo -- dial1 -- dial2 -- Fmt -- Head and Tail -- Prizes -- World Cup -- od -- paste -- pr -- printf -- shuf -- Dice Thrower -- Card Dealer -- Travel Planner -- sort -- Sorting on Keys -- Sorting Log Files by Date and Time -- Sorting Human-Readable Numbers -- tr -- uniq -- wc -- Summary -- Chapter 14: Tools for Systems Administration -- basename -- date -- Typical Uses of date.

More Interesting Uses of date -- dirname -- factor -- identity, groups, and getent -- logger -- md5sum -- mkfifo -- Master and Minions -- Reversing the Order -- Networking -- telnet -- netcat -- ping -- Scripting ssh and scp -- OpenSSL -- nohup -- seq -- Integer Sequences -- Floating Point Sequences -- sleep -- timeout -- Shutdown Script -- Network Timeout -- uname -- uuencode -- xargs -- yes -- Summary -- Part III: Recipes for Systems Administration -- Chapter 15: Shell Features -- Recipe 15-1: Installing Init Scripts -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Recipe 15-2: RPM Report -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Recipe 15-3: Postinstall Scripts -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Chapter 16: Systems Administration -- Recipe 16-1: init Scripts -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Recipe 16-2: CGI Scripts -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Recipe 16-3: Configuration Files -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Recipe 16-4: Locks -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Chapter 17: Presentation -- Recipe 17-1: Space Game -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Chapter 18: Data Storage and Retrieval -- Recipe 18-1: Parsing HTML -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Recipe 18-2: CSV Formatting -- Technologies Used -- Concepts -- Potential Pitfalls.

Structure -- Recipe -- Invocation -- Summary -- Chapter 19: Numbers -- Recipe 19-1: The Fibonacci Sequence -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure for Method 1 -- Recipe for Method 1 -- Invocation of Method 1 -- Structure for Method 2 -- Recipes for Method 2 -- Invocations of Method 2 -- Structure for Method 3 -- Recipe for Method 3 -- Invocation of Method 3 -- Summary -- Recipe 19-2: PXE Booting -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Chapter 20: Processes -- Recipe 20-1: Process Control -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Chapter 21: Internationalization -- Recipe 21-1: Internationalization -- Technologies Used -- Concepts -- Potential Pitfalls -- Structure -- Recipe -- Invocation -- Summary -- Part IV: Reference -- Appendix: Further Reading -- Shell Tutorials and Documentation -- Arrays -- Tools -- Unix Flavors -- Shell Services -- Glossary -- Index -- Advertisement.