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Table 10 Typographic conventions
The title of a book. On the web, this can be a hyperlink to
the book itself.
Book title
A command name or command phrase, for example ls
-a.
Command
Information displayed by the computer.Computer output
A key sequence that indicates you must hold down the
keyboard key labeled Ctrl while you press the letter x.
Ctrl+x or Ctrl-x
The name of an environment variable, for example, PATH.ENVIRONMENT VARIABLE
The name of a keyboard key. Return and Enter both refer
to the same key.
Key
A term or phrase that is defined in the body text of the
document, not in a glossary.
Term
Indicates commands and text that you type exactly as
shown.
User input
The name of a placeholder that you replace with an actual
value.
Replaceable
In command syntax statements, these characters enclose
optional content.
[ ]
In command syntax statements, these characters enclose
required content.
{ }
The character that separates items in a linear list of choices.|
Indicates that the preceding element can be repeated one
or more times.
...
An alert that calls attention to important information that,
if not understood or followed, results in personal injury.
WARNING
An alert that calls attention to important information that,
if not understood or followed, results in data loss, data
corruption, or damage to hardware or software.
CAUTION
An alert that calls attention to essential information.IMPORTANT
An alert that contains additional or supplementary
information.
NOTE
An alert that provides helpful information.TIP
Typographic conventions 19