This book uses the following typographical conventions:
italic
Is used for the names of files, directories, hostnames, domain names, and URLs, and to emphasize new terms when they are first introduced.
constant-width
Is used to show the contents of files, command syntax, and the output from commands.
constant-italic
Is used in examples to show variables for which a context-specific substitution should be made. (The variable filename, for example, would be replaced by some actual filename.)
[ option ]
When showing command syntax, we place optional parts of the command within brackets. For example, ls [-l] means that the -l option is not required.
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