Book Image

Linux Command Line and Shell Scripting Bible - Third Edition

By : Richard Blum, Christine Bresnahan
Book Image

Linux Command Line and Shell Scripting Bible - Third Edition

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)
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

Summary

This chapter put some of the shell-scripting information presented in the book to good use for creating Linux utilities. When you're responsible for a Linux system, whether it's a large multi-user system or your own system, you need to watch lots of things. Instead of manually running commands, you can create shell script utilities to do the work for you.

The first section walked you through using shell scripts for archiving and backing up data files on the Linux system. The tar command is a popular command for archiving data. The chapter showed you how to use it in shell scripts to create archive files and how to manage the archive files in an archive directory.

The next section covered using a shell script for the four steps needed to delete user accounts. Creating functions for shell code that is repeated within a script makes the code easier to read and modify. This script combined many of the different structured commands, such as the case and while commands. The...