Pro Bash Programming · Scripting the GNU/Linux Shell by Johnson, Chris F.A. -- Read -- Imperial Library of Trantor

Index

Cover Page Title Page Copyright Contents at a Glance Contents About the Author About the Technical Reviewer Introduction

Why the Shell? Just the Shell, Ma'am, Just the Shell A Brief History of sh Which Version of Bash? Who Will Benefit from This Book? What's in the Book? Downloading the Code Contacting the Author

CHAPTER 1 Hello, World! Your First Shell Program

The Code The File Choosing and Using a Text Editor Building a Better "Hello, World!" Summary Exercises

CHAPTER 2 Input, Output, and Throughput

Parameter and Variables Arguments and Options echo, and Why You Should Avoid It printf: Formatting and Printing Data Line Continuation Standard Input/Output Streams and Redirection Reading Input Pipelines Command Substitution Exercises

CHAPTER 3 Looping and Branching

Exit Status Testing an Expression Lists Conditional execution Looping while Summary Exercises

CHAPTER 4 Command-Line Parsing and Expansion

Quoting Brace Expansion Tilde Expansion Parameter and Variable Expansion Arithmetic Expansion Command Substitution Word Splitting Pathname Expansion Process Substitution Parsing Options Summary Commands Exercises

CHAPTER 5 Parameters and Variables

The Scope of a Variable: Can You See It from Here? Shell Variables The Naming of Variables Parameter Expansion Positional Parameters Arrays Summary Exercises

CHAPTER 6 Shell Functions

Definition Syntax Compound Commands Getting Results Function Libraries Sample Script Summary Exercises

CHAPTER 7 String Manipulation

Concatenation Processing Character by Character Case Conversion Comparing Contents Without Regard to Case Check for Valid Variable Name Insert One String into Another Overlay Trim Unwanted Characters Index Summary Exercises

CHAPTER 8 File Operations and Commands

Reading a File External Commands Regular Expressions File Name Expansion Options Summary Shell Options External Commands Exercises

CHAPTER 9 Reserved Words and Builtin Commands

help, Display Information About Builtin Commands time, Print Time Taken for Execution of a Command read, Read a Line from an Input Stream Setting Multiple Variables from One Command type, Display Information About Commands builtin, Execute a Builtin Command command, Execute a Command or Display Information About Commands pwd, Print the Current Working Directory Deprecated Builtins Dynamically Loadable Builtins Summary Commands and Reserved Words Exercises

CHAPTER 10 Writing Bug-Free Scripts and Debugging the Rest

Prevention Is Better Than Cure Debugging a Script Summary Exercises

CHAPTER 11 Programming for the Command Line

Manipulating the Directory Stack Filesystem Functions Miscellaneous Functions Managing Man Pages Games Summary Exercises

CHAPTER 12 Runtime Configuration

Defining Variables Command-Line Options and Arguments Menus Q&A Dialogue Configuration Files Scripts with Several Names Environment Variables All Together Now Summary Exercises

CHAPTER 13 Data Processing

Arrays Data File Formats Summary Exercises

CHAPTER 14 Scripting the Screen

Teletypewriter vs. Canvas Stretching the Canvas Priming the Canvas Moving the Cursor Changing Rendition Modes and Colors Placing a Block of Text on the Screen Scrolling Text Rolling Dice Summary Exercises

CHAPTER 15 Entry-Level Programming

Single-Key Entry History in Scripts Sanity Checking Form Entry Reading the Mouse Summary Exercises

APPENDIX Shell Variables

BASH BASHPID BASH_ALIASES BASH_ARGC BASH_ARGV BASH_CMDS BASH_COMMAND BASH_EXECUTION_STRING BASH_LINENO BASH_REMATCH BASH_SOURCE BASH_SUBSHELL BASH_VERSINFO BASH_VERSION COMP_CWORD COMP_KEY COMP_LINE COMP_POINT COMP_TYPE COMP_WORDBREAKS COMP_WORDS DIRSTACK EUID FUNCNAME GROUPS HISTCMD HOSTNAME HOSTTYPE LINENO MACHTYPE OLDPWD OPTARG OPTIND OSTYPE PIPESTATUS PPID PWD RANDOM REPLY SECONDS SHELLOPTS SHLVL UID BASH_ENV CDPATH COLUMNS COMPREPLY EMACS FCEDIT FIGNORE GLOBIGNORE HISTCONTROL HISTFILE HISTFILESIZE HISTIGNORE HISTSIZE HISTTIMEFORMAT HOME HOSTFILE IFS IGNOREEOF INPUTRC LANG LC_ALL LC_COLLATE LC_CTYPE LC_MESSAGES LC_NUMERIC LINES MAIL MAILCHECK MAILPATH OPTERR PATH POSIXLY_CORRECT PROMPT_COMMAND PROMPT_DIRTRIM PS1 PS2 PS3 PS4 SHELL TIMEFORMAT TMOUT TMPDIR auto_resume histchars

Index

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