There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "For example, we have used the netcat command."

A block of code is set as follows:

<!DOCTYPE foo [ <!ENTITY Variable "hello" > ]><somexml><message>&Variable;</message></somexml>

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

chmod 600 privatekey.pem
ssh -i privatekey.pem ec2-user@amazon-dns-ip

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Right-click on the folder and select the Sharing tab. From this menu, select Share."