Mastering Bash: A Step-by-Step Guide to working with Bash Programming and Shell Scripting

Your one stop guide to making the most out of Bash programming
Key Features
From roots to leaves, learn how to program in Bash and automate daily tasks, pouring some spice in your scripts
Daemonize a script and make a real service of it, ensuring it's available at any time to process user-fed data or commands
This book provides functional examples that show you practical applications of commands
Book Description
System administration is an everyday effort that involves a lot of tedious tasks, and devious pits. Knowing your environment is the key to unleashing the most powerful solution that will make your life easy as an administrator, and show you the path to new heights. Bash is your Swiss army knife to set up your working or home environment as you want, when you want.
This book will enable you to customize your system step by step, making your own real, virtual, home out of it. The journey will take you swiftly through the basis of the shell programming in Bash to more interesting and challenging tasks. You will be introduced to one of the most famous open source monitoring systems―Nagios, and write complex programs with it in any languages. You'll see how to perform checks on your sites and applications.
Moving on, you'll discover how to write your own daemons so you can create your services and take advantage of inter-process communication to let your scripts talk to each other. So, despite these being everyday tasks, you'll have a lot of fun on the way. By the end of the book, you will have gained advanced knowledge of Bash that will help you automate routine tasks and manage your systems.
What you will learn
Understand Bash right from the basics and progress to an advanced level
Customise your environment and automate system routine tasks
Write structured scripts and create a command-line interface for your scripts
Understand arrays, menus, and functions
Securely execute remote commands using ssh
Write Nagios plugins to automate your infrastructure checks
Interact with web services, and a Slack notification script
Find out how to execute subshells and take advantage of parallelism
Explore inter-process communication and write your own daemon
Who This Book Is For
If you're a power user or system administrator involved in writing Bash scripts to automate tasks, then this book is for you. This book is also ideal for advanced users who are engaged in complex daily tasks.
Table of Contents
Let's Start Programming
Operators
Testing
Quoting and Escaping
Menus, Arrays, and Functions
Iterations
Plug into the Real World
We Want to Chat
Subshells, Signals, and Job Controls
Let's Make a Process Chat
Living as a Daemon
Remote Connections over SSH
It's Time for a Timer
Time for Safety