The scalar ref method doesn't work that way, you can't assign a bareword. It should look like this:
open my $filehandle, '>', $filename or die "$!";
If you want to open a generic handle, I think you might want to look into IO::Tee. When you invoke it, you can specify an input handle and an output handle, thusly:
use IO:Tee;
open my $input_handle, $in_filename or die "$!";
open my $output_handle, '>', $out_filename or die "$!";
$generic_handle = IO::Tee->new($input_handle, $output_handle);
That will let you read or write to
$generic_handle
Update: Added code to clarify you have to open $input_handle and $output_handle before teeing them.
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