I didn't try to run your entire code.
I am replying to your question: " How do I declare $fh in subroutine printout so it recognizes the intended filehandle?".
This is not right: $fh=STDOUT unless($fh);
Try this instead:
use strict; # always enable all strictures
use warnings;
my @lines = ("asdf", "xyz");
printout (\@lines);
#
# Default to STDOUT if no file handle specified
#
sub printout {
my($line_ref,$fh)=@_;
$fh= *STDOUT unless ($fh); # *STDOUT is a typeglob
foreach my $line (@{$line_ref}) {
print $fh "$line\n";
}
} # End printout;
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