Learning the bash Shell. Unix Shell Programming. 3rd Edition

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• Learning the bash Shell, 3rd Edition
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  • Preface
    • bash Versions
    • Summary of bash Features
    • Intended Audience
    • Code Examples
    • Chapter Summary
    • Conventions Used in This Handbook
    • Wed Like to Hear from You
    • Using Code Examples
    • Safari Enabled
    • Acknowledgments for the First Edition
    • Acknowledgments for the Second Edition
    • Acknowledgments for the Third Edition
  • 1. bash Basics
    • 1.1. What Is a Shell?
    • 1.2. Scope of This Book
    • 1.3. History of UNIX Shells
      • 1.3.1. The Bourne Again Shell
      • 1.3.2. Features of bash
    • 1.4. Getting bash
    • 1.5. Interactive Shell Use
      • 1.5.1. Commands, Arguments, and Options
    • 1.6. Files
      • 1.6.1. Directories
        • 1.6.1.1. The working directory
        • 1.6.1.2. Tilde notation
        • 1.6.1.3. Changing working directories
      • 1.6.2. Filenames, Wildcards, and Pathname Expansion
      • 1.6.3. Brace Expansion
    • 1.7. Input and Output
      • 1.7.1. Standard I/O
      • 1.7.2. I/O Redirection
      • 1.7.3. Pipelines
    • 1.8. Background Jobs
      • 1.8.1. Background I/O
      • 1.8.2. Background Jobs and Priorities
    • 1.9. Special Characters and Quoting
      • 1.9.1. Quoting
      • 1.9.2. Backslash-Escaping
      • 1.9.3. Quoting Quotation Marks
      • 1.9.4. Continuing Lines
      • 1.9.5. Control Keys
    • 1.10. Help
  • 2. Command-Line Editing
    • 2.1. Enabling Command-Line Editing
    • 2.2. The History List
    • 2.3. emacs Editing Mode
      • 2.3.1. Basic Commands
      • 2.3.2. Word Commands
      • 2.3.3. Line Commands
      • 2.3.4. Moving Around in the History List
      • 2.3.5. Textual Completion
      • 2.3.6. Miscellaneous Commands
    • 2.4. vi Editing Mode
      • 2.4.1. Simple Control Mode Commands
      • 2.4.2. Entering and Changing Text
      • 2.4.3. Deletion Commands
      • 2.4.4. Moving Around in the History List
      • 2.4.5. Character-Finding Commands
      • 2.4.6. Textual Completion
      • 2.4.7. Miscellaneous Commands
    • 2.5. The fc Command
    • 2.6. History Expansion
    • 2.7. readline
      • 2.7.1. The readline Startup File
        • 2.7.1.1. readline variables
      • 2.7.2. Key Bindings Using bind
    • 2.8. Keyboard Habits
  • 3. Customizing Your Environment
    • 3.1. The .bash_profile, .bash_logout, and .bashrc Files
    • 3.2. Aliases
    • 3.3. Options
      • 3.3.1. shopt
    • 3.4. Shell Variables
      • 3.4.1. Variables and Quoting
      • 3.4.2. Built-In Variables
        • 3.4.2.1. Editing mode variables
        • 3.4.2.2. Mail variables
        • 3.4.2.3. Prompting variables
        • 3.4.2.4. Command search path
        • 3.4.2.5. Command hashing
        • 3.4.2.6. Directory search path and variables
        • 3.4.2.7. Miscellaneous variables
    • 3.5. Customization and Subprocesses
      • 3.5.1. Environment Variables
        • 3.5.1.1. Terminal types
        • 3.5.1.2. Other common variables
      • 3.5.2. The Environment File
    • 3.6. Customization Hints
  • 4. Basic Shell Programming
    • 4.1. Shell Scripts and Functions
      • 4.1.1. Functions
    • 4.2. Shell Variables
      • 4.2.1. Positional Parameters
        • 4.2.1.1. Positional parameters in functions
      • 4.2.2. Local Variables in Functions
      • 4.2.3. Quoting with $@ and $*
      • 4.2.4. More on Variable Syntax
    • 4.3. String Operators
      • 4.3.1. Syntax of String Operators
      • 4.3.2. Patterns and Pattern Matching
      • 4.3.3. Length Operator
      • 4.3.4. Extended Pattern Matching
    • 4.4. Command Substitution
    • 4.5. Advanced Examples: pushd and popd
  • 5. Flow Control
    • 5.1. if/else
      • 5.1.1. Exit Status
      • 5.1.2. Return
      • 5.1.3. Combinations of Exit Statuses
      • 5.1.4. Condition Tests
        • 5.1.4.1. String comparisons
        • 5.1.4.2. File attribute checking
      • 5.1.5. Integer Conditionals
    • 5.2. for
    • 5.3. case
    • 5.4. select
    • 5.5. while and until
  • 6. Command-Line Options and Typed Variables
    • 6.1. Command-Line Options
      • 6.1.1. shift
      • 6.1.2. Options with Arguments
      • 6.1.3. getopts
    • 6.2. Typed Variables
    • 6.3. Integer Variables and Arithmetic
      • 6.3.1. Arithmetic Conditionals
      • 6.3.2. Arithmetic Variables and Assignment
      • 6.3.3. Arithmetic for Loops
    • 6.4. Arrays
  • 7. Input/Output and Command-Line Processing
    • 7.1. I/O Redirectors
      • 7.1.1. Here-documents
      • 7.1.2. File Descriptors
    • 7.2. String I/O
      • 7.2.1. echo
        • 7.2.1.1. Options to echo
        • 7.2.1.2. echo escape sequences
      • 7.2.2. printf
        • 7.2.2.1. Additional bash printf specifiers
      • 7.2.3. read
        • 7.2.3.1. Reading lines from files
        • 7.2.3.2. I/O redirection and multiple commands
        • 7.2.3.3. Command blocks
        • 7.2.3.4. Reading user input
    • 7.3. Command-Line Processing
      • 7.3.1. Quoting
      • 7.3.2. command, builtin, and enable
      • 7.3.3. eval
  • 8. Process Handling
    • 8.1. Process IDs and Job Numbers
    • 8.2. Job Control
      • 8.2.1. Foreground and Background
      • 8.2.2. Suspending a Job
    • 8.3. Signals
      • 8.3.1. Control-Key Signals
      • 8.3.2. kill
      • 8.3.3. ps
        • 8.3.3.1. System V
        • 8.3.3.2. BSD
    • 8.4. trap
      • 8.4.1. Traps and Functions
      • 8.4.2. Process ID Variables and Temporary Files
      • 8.4.3. Ignoring Signals
      • 8.4.4. disown
      • 8.4.5. Resetting Traps
    • 8.5. Coroutines
      • 8.5.1. wait
      • 8.5.2. Advantages and Disadvantages of Coroutines
      • 8.5.3. Parallelization
    • 8.6. Subshells
      • 8.6.1. Subshell Inheritance
      • 8.6.2. Nested Subshells
    • 8.7. Process Substitution
  • 9. Debugging Shell Programs
    • 9.1. Basic Debugging Aids
      • 9.1.1. Set Options
      • 9.1.2. Fake Signals
        • 9.1.2.1. EXIT
        • 9.1.2.2. ERR
        • 9.1.2.3. DEBUG
        • 9.1.2.4. RETURN
      • 9.1.3. Debugging Variables
    • 9.2. A bash Debugger
      • 9.2.1. Structure of the Debugger
        • 9.2.1.1. The driver script
        • 9.2.1.2. exec
      • 9.2.2. The Preamble
      • 9.2.3. Debugger Functions
        • 9.2.3.1. Commands
        • 9.2.3.2. Stepping
        • 9.2.3.3. Breakpoints
        • 9.2.3.4. Break conditions
        • 9.2.3.5. Execution tracing
        • 9.2.3.6. Debugger limitations
      • 9.2.4. A Sample bashdb Session
      • 9.2.5. Exercises
  • 10. bash Administration
    • 10.1. Installing bash as the Standard Shell
      • 10.1.1. POSIX Mode
      • 10.1.2. Command-Line Options
    • 10.2. Environment Customization
      • 10.2.1. umask
      • 10.2.2. ulimit
      • 10.2.3. Types of Global Customization
    • 10.3. System Security Features
      • 10.3.1. Restricted Shell
      • 10.3.2. A System Break-In Scenario
      • 10.3.3. Privileged Mode
  • 11. Shell Scripting
    • 11.1. What's That Do?
      • 11.1.1. Comments
      • 11.1.2. Variables and Constants
    • 11.2. Starting Up
    • 11.3. Potential Problems
    • 11.4. Don't Use bash
  • 12. bash for Your System
    • 12.1. Obtaining bash
    • 12.2. Unpacking the Archive
    • 12.3. What's in the Archive
      • 12.3.1. Documentation
      • 12.3.2. Configuring and Building bash
      • 12.3.3. Testing bash
      • 12.3.4. Potential Problems
      • 12.3.5. Installing bash as a Login Shell
      • 12.3.6. Examples
    • 12.4. Who Do I Turn to?
      • 12.4.1. Asking Questions
      • 12.4.2. Reporting Bugs
  • A. Related Shells
    • A.1. The Bourne Shell
    • A.2. The IEEE 1003.2 POSIX Shell Standard
    • A.3. The Korn Shell
    • A.4. pdksh
    • A.5. zsh
    • A.6. Shell Clones and Unix-like Platforms
      • A.6.1. Cygwin
      • A.6.2. DJGPP
      • A.6.3. MKS Toolkit
      • A.6.4. AT&T UWIN
  • B. Reference Lists
    • B.1. Invocation
    • B.2. Prompt String Customizations
    • B.3. Built-In Commands and Reserved Words
    • B.4. Built-In Shell Variables
    • B.5. Test Operators
    • B.6. set Options
    • B.7. shopt Options
    • B.8. I/O Redirection
    • B.9. emacs Mode Commands
    • B.10. vi Control Mode Commands
  • C. Loadable Built-Ins
  • D. Programmable Completion
  • Index
  • About the Author
  • Colophon
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