Words or characters that require special attention.

Placeholders for information you must supply. For example, if the guide says to enter the arp -d hostname command, you enter the characters arp -d followed by the actual name of the host.

Book titles in cross-references.

Command and daemon names.

Information displayed on the system console or other computer monitors.

The contents of files.

Words or characters you type.

What you type is always shown in lowercase letters, unless you must type it in uppercase letters.