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 explanations of their meanings.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "Now let's attempt to execute the hello.txt file and see what happens."

A block of code is set as follows:

case INTERFACE_TRANSACTION:
{
reply.writeString(DESCRIPTOR);
return true;
}

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

$ su testuser
Password: 
testuser@ubuntu:/home/bookuser$ 

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: "Exit the configuration menus by selecting Exit until you are asked to save your new configuration."