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The names of commands, files, and directories, and onscreen computer output 

Edit your .login file.

Use ls -a to list all files.

machine_name% you have mail.

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What you type, contrasted with onscreen computer output 

machine_name% su

Password:

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A placeholder to be replaced with a real name or value 

The command to remove a file is rm filename.

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Book titles, new terms, and terms to be emphasized (note that some emphasized items appear bold online) 

Read Chapter 6 in the User's Guide.

A cache is a copy that is stored locally.

Do not save the file.