In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows:

"The tool is more interactive than the classic awscli command."

A block of code is set as follows:

- name: Import Jenkins GPG key
  rpm_key:
    state: present
    key: http://pkg.jenkins-ci.org/redhat/jenkins-ci.org.key 

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

describe('main page', function() {
  before(function() {
    this.browser = new Browser({ site: 'http://localhost:3000' });
  });

  it('should say hello world');
}); 

Any command-line input or output is written as follows:

$ npm install zombie 

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this:

"Click on Create pull request and follow the steps to create a pull request. "