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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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Command-line placeholder: replace with a real name or value

To delete a file, type rm filename.

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Book titles, new terms, or terms to be emphasized

Read Chapter 6 in User's Guide.

These are called class options.

You must be root to do this.