Other Subroutine Functions
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There's more you can do with a subroutine, but we probably will not cover
them unless we have time.
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They are covered in the book.
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Using a return value: page 122
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Setting the return value: page 123
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Storing subroutines in a separate file: 124
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Calling subroutines from a separate file: 125
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Note, we already do that with CGI.pm
Writing to a file, sending an e-mail
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