The bash shell is a complete programming language, not merely a glue to combine external Linux commands. By taking full advantage of shell internals, shell programs can perform as snappily as utilities written in C or other compiled languages. And you will see how, without assuming Unix lore, you can write professional bash 4.0 programs through standard programming techniques.

Complete bash coverage
Teaches bash as a programming language
Helps you master bash 4.0 features

What you’ll learn

Use the shell to write new utilities and accomplish most programming tasks.
Use shell parameter expansion to replace many external commands, making scripts very fast.
Learn to avoid many common mistakes that cause scripts to fail.
Learn how bash’s readline and history libraries can save typing when getting user input.
Learn to use features new to bash 4.0.
Build shell scripts that get information from the Web.

Who this book is for

Beginning Linux and Unix system administrators who want to be in full command of their systems.

Table of Contents

Hello, World! Your First Shell Program
Input, Output, and Throughput
Looping and Branching
Command-Line Parsing and Expansion
Parameters and Variables
Shell Functions
String Manipulation
File Operations and Commands
Reserved Words and Builtin Commands
Writing Bug-Free Scripts and Debugging the Rest
Programming for the Command Line
Runtime Configuration
Data Processing
Scripting the Screen
Entry-Level Programming

L'autore:

Chris F.A. Johnson was introduced to Unix in 1990 and learned shell scripting because there was no C compiler on the system. His first major project was a menu-driven, user-extensible database system with report generator. Chris uses the shell as his primary, general-purpose programming language, and his projects have included a member database, menuing system, and POP3 mail filtering and retrieval. Chris is the author of Shell Scripting Recipes: A Problem-Solution Approach (Apress, 2005). When not pushing shell scripting to the limit, he designs and codes web sites, teaches chess, and composes cryptic crosswords.

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