How can I set up a footer format to be used with write()?
There's no built-in way to do this, but
the perlform manpage
has a couple of techniques to make it possible for the intrepid hacker.
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How can I make a filehandle local to a subroutine? How do I pass filehandles between subroutines? How do I make an array of filehandles?
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How can I use write() into a string?
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the perlfaq5 manpage