bash Idioms: Write Powerful, Flexible, Readable Shell Scripts

Preface
        Running bash
            bash on Mac
            bash in Containers
        Revision Control
        Hello World
        Conventions Used in This Book
        Using Code Examples
        O’Reilly Online Learning
        How to Contact Us
        Acknowledgments
            bash
            Reviewers
            O’Reilly
            From Carl
            From JP
    1. A Big “if” Idiom
        The Big “if”
        Or ELSE…
        More than One
        More than One Again
        Don’t Do This
        Style and Readability: Recap
    2. Looping Lingo
        Looping Constructs
        Explicit Values
        Similar to Python
        Quotes and Spaces
        Developing and Testing for Loops
        while and until
        Style and Readability: Recap
    3. Just in CASE
        Make Your Case
        A Realistic Use Case
            Motivation
            Our Script
        Wrapper Scripts
        One More Twist
        Style and Readability: Recap
    4. Variable Vernacular
        Variable Reference
        Parameter Expansion
            Shorthand for basename
            Path or Prefix Removal
            Shorthand for dirname or Suffix Removal
            Other Modifiers
        Conditional Substitutions
            Default Values
            Comma-Separated Lists
            Modified Value
        $RANDOM
        Command Substitution
        Style and Readability: Recap
    5. Expressions and Arithmetic
        Arithmetic
            No Parentheses Needed
        Compound Commands
        Style and Readability: Recap
    6. Functional Framework
        Calling Functions
        Defining Functions
            Function Parameters
            Function Return Values
            Local Variables
            Function Special Cases
        Time for printf
            POSIX Output
            Getting or Using the Date and Time
            printf for Reuse or Debugging
        Style and Readability: Recap
    7. List and Hash Handling
        Commonalities
        Lists
        Hashes
        A Simple Word Count Example
        Style and Readability: Recap
    8. Arguing
        Your First Argument
        Having Options
            Parsing Options
        Long Arguments
        HELP!
        Debug and Verbose
        Version
        Style and Readability: Recap
    9. Files and More
        Reading Files
            read
            mapfile
            Brute Force
        Fiddling with $IFS for Fun and Profit, to Read Files
        Pretend Files
        Drop-in Directories
        Using a Library
        Shebang!
        Unofficial bash Strict Mode
        Exit Codes
        It’s a Trap!
        Here-Documents and Here-Strings
        Are We Interactive?
        Summary
    10. Beyond Idioms: Working with bash
        Prompts
            bash Time Zone
        Getting User Input
            read
            pause
            select
        Aliases
        Functions
        Local Variables
        Readline Hacks
        Using logger from bash
        Handling JSON with jq
        Grepping the Process List
        Rotating Old Files
        Embedded Documentation
        bash Debugging
        bash Unit Testing
        Summary
    11. Developing Your Style Guide
        Readability
        Comments
        Names
        Functions
        Quoting
        Layout
        Syntax
        Other
        Script Template
        Other Style Guides
        bash Linter
        Summary
    A. The bash Idioms Style Guide
        Readability
        Comments
        Names
        Functions
        Quoting
        Layout
        Syntax
        Other
        Script Template
    Index
    About the Authors