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@output = $timestamp .'.sql';
open(my $fh, '>', @output) or die "Could not create file '@output': $!
+";

$output = $timestamp .'.sql';
open(my $fh, '>', $output) or die "Could not create file '$output': $!
+";

open(my $fn, '<', $filename) ...

open(my $fn, '<', "$directory/$filename") ...