Conventions Used in This Book

We used the following typographical conventions in this book:

Italic

Indicates new terms, commands and command-line options, URLs, email addresses, filenames, and file extensions.

Constant width

Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, data types, and environment variables.

Constant width bold

Shows user input at the command line.

Constant width italic

Shows placeholder user input that you should replace with something that makes sense for you.

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