Conventions in This Book (Perl in a Nutshell, 2nd Edition)

0.2. Conventions in This Book

Italics: Used for filenames, program names, URLs, command-line options, email addresses, and to introduce new terms.
Constant Width: Used for code snippets, method and function names, text that should be typed literally, variables, constants, mail headers, and configuration directives.
Constant Width Italic: Used for replaceable items in code examples and syntax lines.

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