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: "It initializes the variable x, which is an integer."

A block of code is set as follows:

int main()
{
   int x = 42;
   // this line will produce compilation error
   x = "forty two";
   return 0;
}

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

sudo apt-get update

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: "It varies from version to version, but in most cases may be found if you right-click on My Computer and choose Properties, then look for the Advanced panel and the Environment Variables… tab."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.