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Mastering Chef

You're reading from   Mastering Chef Build, deploy, and manage your IT infrastructure to deliver a successful automated system with Chef in any environment

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Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781783981564
Length 374 pages
Edition 1st Edition
Languages
Tools
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Author (1):
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Mayank Joshi Mayank Joshi
Author Profile Icon Mayank Joshi
Mayank Joshi
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Toc

Table of Contents (15) Chapters Close

Preface 1. Introduction to the Chef Ecosystem FREE CHAPTER 2. Knife and Its Associated Plugins 3. Chef and Ruby 4. Controlling Access to Resources 5. Starting the Journey to the World of Recipes 6. Cookbooks and LWRPs 7. Roles and Environments 8. Attributes and Their Uses 9. Ohai and Its Plugin Ecosystem 10. Data Bags and Templates 11. Chef API and Search 12. Extending Chef 13. (Ab)Using Chef Index

IRB


IRB is an acronym for "interactive Ruby". It's a tool that provided alongside Ruby interpreter, which allows for the interactive execution of Ruby expressions. These expressions are delivered to IRB using standard input.

Let's quickly see IRB in action:

  ~  irb
2.1-head :001 >

When we enter the irb command, it throws a shell at us. The format of the shell prompt is as follows:

$RUBY_VERSION :$LINE_NUMBER >

You can customize this prompt to your liking. However, for now, just remember that whatever expression you enter at the prompt is interpreted as a Ruby expression and is evaluated right away.

Consider the following as an example:

irb
2.1-head :001 > 2+3
 => 5

As you can see, we entered an arithmetic expression to compute the sum of two numbers, 2 and 3, and in return IRB returned us the output of computation.

To exit out of IRB, just issue the quit or exit command at the prompt.

To learn more about IRB and how to customize it to your liking, read the IRB documentation at http...

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