Bash/index

Bash Reference Manual

Table of Contents

• 1 Introduction
  • 1.1 What is Bash?
  • 1.2 What is a shell?
• 2 Definitions
• 3 Basic Shell Features
  • 3.1 Shell Syntax
    • 3.1.1 Shell Operation
    • 3.1.2 Quoting
      • 3.1.2.1 Escape Character
      • 3.1.2.2 Single Quotes
      • 3.1.2.3 Double Quotes
      • 3.1.2.4 ANSI-C Quoting
      • 3.1.2.5 Locale-Specific Translation
    • 3.1.3 Comments
  • 3.2 Shell Commands
    • 3.2.1 Simple Commands
    • 3.2.2 Pipelines
    • 3.2.3 Lists of Commands
    • 3.2.4 Compound Commands
      • 3.2.4.1 Looping Constructs
      • 3.2.4.2 Conditional Constructs
      • 3.2.4.3 Grouping Commands
    • 3.2.5 Coprocesses
    • 3.2.6 GNU Parallel
  • 3.3 Shell Functions
  • 3.4 Shell Parameters
    • 3.4.1 Positional Parameters
    • 3.4.2 Special Parameters
  • 3.5 Shell Expansions
    • 3.5.1 Brace Expansion
    • 3.5.2 Tilde Expansion
    • 3.5.3 Shell Parameter Expansion
    • 3.5.4 Command Substitution
    • 3.5.5 Arithmetic Expansion
    • 3.5.6 Process Substitution
    • 3.5.7 Word Splitting
    • 3.5.8 Filename Expansion
      • 3.5.8.1 Pattern Matching
    • 3.5.9 Quote Removal
  • 3.6 Redirections
    • 3.6.1 Redirecting Input
    • 3.6.2 Redirecting Output
    • 3.6.3 Appending Redirected Output
    • 3.6.4 Redirecting Standard Output and Standard Error
    • 3.6.5 Appending Standard Output and Standard Error
    • 3.6.6 Here Documents
    • 3.6.7 Here Strings
    • 3.6.8 Duplicating File Descriptors
    • 3.6.9 Moving File Descriptors
    • 3.6.10 Opening File Descriptors for Reading and Writing
  • 3.7 Executing Commands
    • 3.7.1 Simple Command Expansion
    • 3.7.2 Command Search and Execution
    • 3.7.3 Command Execution Environment
    • 3.7.4 Environment
    • 3.7.5 Exit Status
    • 3.7.6 Signals
  • 3.8 Shell Scripts
• 4 Shell Builtin Commands
  • 4.1 Bourne Shell Builtins
  • 4.2 Bash Builtin Commands
  • 4.3 Modifying Shell Behavior
    • 4.3.1 The Set Builtin
    • 4.3.2 The Shopt Builtin
  • 4.4 Special Builtins
• 5 Shell Variables
  • 5.1 Bourne Shell Variables
  • 5.2 Bash Variables
• 6 Bash Features
  • 6.1 Invoking Bash
  • 6.2 Bash Startup Files
  • 6.3 Interactive Shells
    • 6.3.1 What is an Interactive Shell?
    • 6.3.2 Is this Shell Interactive?
    • 6.3.3 Interactive Shell Behavior
  • 6.4 Bash Conditional Expressions
  • 6.5 Shell Arithmetic
  • 6.6 Aliases
  • 6.7 Arrays
  • 6.8 The Directory Stack
    • 6.8.1 Directory Stack Builtins
  • 6.9 Controlling the Prompt
  • 6.10 The Restricted Shell
  • 6.11 Bash POSIX Mode
• 7 Job Control
  • 7.1 Job Control Basics
  • 7.2 Job Control Builtins
  • 7.3 Job Control Variables
• 8 Command Line Editing
  • 8.1 Introduction to Line Editing
  • 8.2 Readline Interaction
    • 8.2.1 Readline Bare Essentials
    • 8.2.2 Readline Movement Commands
    • 8.2.3 Readline Killing Commands
    • 8.2.4 Readline Arguments
    • 8.2.5 Searching for Commands in the History
  • 8.3 Readline Init File
    • 8.3.1 Readline Init File Syntax
    • 8.3.2 Conditional Init Constructs
    • 8.3.3 Sample Init File
  • 8.4 Bindable Readline Commands
    • 8.4.1 Commands For Moving
    • 8.4.2 Commands For Manipulating The History
    • 8.4.3 Commands For Changing Text
    • 8.4.4 Killing And Yanking
    • 8.4.5 Specifying Numeric Arguments
    • 8.4.6 Letting Readline Type For You
    • 8.4.7 Keyboard Macros
    • 8.4.8 Some Miscellaneous Commands
  • 8.5 Readline vi Mode
  • 8.6 Programmable Completion
  • 8.7 Programmable Completion Builtins
  • 8.8 A Programmable Completion Example
• 9 Using History Interactively
  • 9.1 Bash History Facilities
  • 9.2 Bash History Builtins
  • 9.3 History Expansion
    • 9.3.1 Event Designators
    • 9.3.2 Word Designators
    • 9.3.3 Modifiers
• 10 Installing Bash
  • 10.1 Basic Installation
  • 10.2 Compilers and Options
  • 10.3 Compiling For Multiple Architectures
  • 10.4 Installation Names
  • 10.5 Specifying the System Type
  • 10.6 Sharing Defaults
  • 10.7 Operation Controls
  • 10.8 Optional Features
• Appendix A Reporting Bugs
• Appendix B Major Differences From The Bourne Shell
  • B.1 Implementation Differences From The SVR4.2 Shell
• Appendix C GNU Free Documentation License
• Appendix D Indexes
  • D.1 Index of Shell Builtin Commands
  • D.2 Index of Shell Reserved Words
  • D.3 Parameter and Variable Index
  • D.4 Function Index
  • D.5 Concept Index

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Bash Features

This text is a brief description of the features that are present in the Bash shell (version 5.0, 12 May 2019). The Bash home page is http://www.gnu.org/software/bash/.

This is Edition 5.0, last updated 12 May 2019, of The GNU Bash Reference Manual, for Bash, Version 5.0.

Bash contains features that appear in other popular shells, and some features that only appear in Bash. Some of the shells that Bash has borrowed concepts from are the Bourne Shell (sh), the Korn Shell (ksh), and the C-shell (csh and its successor, tcsh). The following menu breaks the features up into categories, noting which features were inspired by other shells and which are specific to Bash.

This manual is meant as a brief introduction to features found in Bash. The Bash manual page should be used as the definitive reference on shell behavior.

• Introduction:		An introduction to the shell.
• Definitions:		Some definitions used in the rest of this manual.
• Basic Shell Features:		The shell "building blocks".
• Shell Builtin Commands:		Commands that are a part of the shell.
• Shell Variables:		Variables used or set by Bash.
• Bash Features:		Features found only in Bash.
• Job Control:		What job control is and how Bash allows you to use it.
• Command Line Editing:		Chapter describing the command line editing features.
• Using History Interactively:		Command History Expansion
• Installing Bash:		How to build and install Bash on your system.
• Reporting Bugs:		How to report bugs in Bash.
• Major Differences From The Bourne Shell:		A terse list of the differences between Bash and historical versions of /bin/sh.
• GNU Free Documentation License:		Copying and sharing this documentation.
• Indexes:		Various indexes for this manual.

Next: Introduction, Previous: (dir), Up: (dir)   [Contents][Index]