Conventions used in this book
thisdenotes text that you enter literally.
- this
means variable text, i.e., things you must fill in.
- thisâ
means that if this is omitted,
$_will be used instead.- word
is a keyword, i.e., a word with a special meaning.
- [. . . ]
denotes an optional part.
points to related documents, which can be viewed with a
perldoccommand.
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