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  1. or download this
      my $log = ...;
  my $err = ...;
...

  open(SAVEERR, ">&STDERR") or die ...
  open(STDERR,"> $err") or die ..
  2. or download this
      open(STDOUT, ">&SAVEOUT");
  open(STDERR, ">&SAVEERR");
  3. or download this
      open(STDOUT, ">&$SAVEOUT");
  open(STDERR, ">&$SAVEERR");