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# real file
perl -Mstrict -wE "open my $fh,'<','out.log' or die;say fileno($fh) ? 
+'FileHandle! '.fileno($fh):'NA'"
...
perl -Mstrict -wE "open my $fh,'<','out.logXX';say fileno($fh) ? 'File
+Handle! '.fileno($fh):'NA'"
NA