This book uses the following typographical conventions:
Italic
is used for the names of files, directories, host names, domain names, URLs, and to emphasize new terms when they are first introduced.
- bold
is used for command names.
constant-width
is used to show the contents of files or the output from commands.
constant-bold
is used in examples to show commands or text that would be typed literally by you.
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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