One of the most used facilities on a server is actually the scheduler, even if we do not realize how much we rely on it. Some of the services that run unattended on our systems are dealt with by a scheduler, which is in charge to run them at specific times over a span of days, weeks, and months. All those humble, repetitive tasks, which are so essential for the correct functioning of our environment, are hidden behind the curtains and do what we would not like to do, for instance, rotate all the system logs when it is needed. Would we do these jobs every day, at crazy hours, for all the services that require maintenance? No, we have better things to do. The cron scheduler does not have any better things to do; its purpose is to wake up every minute and check if something has to be done, and this makes it the best candidate to perform tedious repetitive tasks...
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