open STDOUT, '>>', "$log_dir/$log_file", but really 
use File::Spec::Functions;
...
open STDOUT, '>>', catfile( $log_dir, $log_file )
  or die "Can't open $log_file - $!\n";

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In reply to Re^2: getopt::std to pass arguments to command line help by Anonymous Monk
in thread getopt::std to pass arguments to command line help by hextor

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