Book Image

Mastering Bash

By : Giorgio Zarrelli
Book Image

Mastering Bash

By: Giorgio Zarrelli

Overview of this book

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.
Table of Contents (15 chapters)

What is a JSON?

JSON, or JavaScript Object Notation, is an open, standard format (ECMA-404) widely used to exchange data between applications. Created in 2007 as a subset of the JavaScript programing language, it quickly became adopted by many languages as a means to deliver data regardless of the language of the sending and receiving applications to be a neutral conveyor. We can find a JSON file modeled on two different structures.

An object composed by name: value pairs, opened and closed by a bracket with each name separated from the corresponding value by a colon and each pair separated by a comma, such as the following example:

{
"name" : "Janet",
"state" : "California",
"cake" : "Toffee sticky pudding"
}

An ordered list of values inside an array opened and closed by a square bracket and the values separated by a comma...