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Linux Command Line and Shell Scripting Bible

Linux Command Line and Shell Scripting Bible - Third Edition

By : Richard Blum, Christine Bresnahan
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Linux Command Line and Shell Scripting Bible

Linux Command Line and Shell Scripting Bible

By: Richard Blum, Christine Bresnahan

Overview of this book

The Linux command line enables you to type specific shell commands directly into the system to manipulate files and query system resources. Command line statements can be combined into short programs called shell scripts, a practice increasing in popularity due to its usefulness in automation. Linux is a robust system with tremendous potential, and Linux Command Line and Shell Scripting Bible opens the door to new possibilities. Linux Command Line and Shell Scripting Bible is your essential Linux guide. It contains new functional examples that are fully updated to align with the latest Linux features. Beginning with command line fundamentals, the book moves into shell scripting and shows you the practical application of commands in automating frequently performed functions. This book is a complete guide providing detailed instruction and expert advice working within this aspect of Linux. Whether used as a tutorial or as a quick reference, this book contains information that every Linux user should know.
Table of Contents (34 chapters)
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2
Part I: The Linux Command Line
13
Part II: Shell Scripting Basics
20
Part III: Advanced Shell Scripting
28
Part IV: Creating Practical Scripts
32
End User License Agreement
2
Appendix B: Quick Guide to sed and gawk

Working with Arrays

Many programming languages provide arrays for storing multiple values in a single variable. The gawk programming language provides the array feature using associative arrays.

Associative arrays are different from numerical arrays in that the index value can be any text string. You don't have to use sequential numbers to identify data elements contained in the array. Instead, an associative array consists of a hodge-podge of strings referencing values. Each index string must be unique and uniquely identifies the data element that's assigned to it. If you're familiar with other programming languages, this is the same concept as hash maps or dictionaries.

The following sections walk you through using associative array variables in your gawk programs.

Defining array variables

You can define an array variable using a standard assignment statement. Here's the format of the array variable assignment:

var[index] = element

In this example, var is the variable...

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