At this point of the book, we know enough to write our own code, process variables, interact with the user, and the environment, many things altogether, and so we are ready to make a mess. We know how to write a bunch of lines, but we still do not know how to keep things clean and tidy and, moreover, how to make our code reusable. As we can easily guess from the examples seen so far, a script or a command line is a one way processed flow of code; the characters making up our commands are read from left to right, from top to bottom. So, when you pass a construct or an assignment, it is done and if you want to process something the same way you did before; you have to rewrite the code that carried on the procedure again. So, if you are coding more than a small script you risk to end up with a huge amount of repetitive code, sloppy layout; and inefficiency; but Bash, like...
Mastering Bash
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Mastering Bash
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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.
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Current Title:
Mastering Bash
Table of Contents (15 chapters)
Preface
Free Chapter
Let's Start Programming
Operators
Quoting and Escaping
Menus, Arrays, and Functions
Iterations
Plug into the Real World
We Want to Chat
Subshells, Signals, and Job Controls
Lets Make a Process Chat
Living as a Daemon
Remote Connections over SSH
Its Time for a Timer
Customer Reviews