Conventions

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: "Aside from Oracle, another port of interest is the port 3306."

A block of code is set as follows:

<title><%= title %></title>
<h1>You can change this template to suit your needs.</h1>

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

  Not shown: 999 closed ports
  PORT   STATE SERVICE VERSION
  80/tcp open  http    Apache httpd/2.4.7 ((Ubuntu))
  |_http-title: Site doesn't have a title (text/html)
  TRACEROUTE
  HOP RTT     ADDRESS

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

$ sudo -i
# apt-get update
# apt-get upgrade

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: "Once you verified your settings, click on Apply | OK."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.