$fh = new ([params])
Constructor. Creates an IO::File object, passing any parameters to the method open. If the open fails, the object is destroyed. Otherwise, it is returned to the caller.
$fh = new_tmpfile
Constructor. Creates an IO::File object opened for read/write on a newly created temporary file. If the system permits, the temporary file is anonymous; if the temporary file cannot be created or opened, the object is destroyed. Otherwise, it is returned to the caller.
$fh->open(filename[, mode[, perms]])
Opens the newly created filehandle. Accepts one, two, or three parameters. With one parameter, it acts as a frontend for Perl's built-in open function. With two parameters, the first parameter is a filename, and the second is the open mode, optionally followed by a third parameter, the file permission value.
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