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File::NCopy::copy copies files to directories, or a single file to
another file. You can also use a reference to a file handle if
you wish whem doing a file to file copy. The functionality is very
similar to cp. If the argument is a directory to directory copy
and the recursive flag is set then it is done recursively like cp
-R. In fact it behaves like cp on Unix for the most part. If
called in array context, an array of successful copies is returned,
otherwise the number of succesful copies is returned. If passed
a file handle, it's difficult to make sure the file we are copying
isn't the same that we are copying to, since by opening the file
in write mode it gets pooched. To avoid this use file names instead,
if at all possible, especially for the to file. If passed a file
handle, it is not closed when copy returns, files opened by copy
are closed.
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