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  1. or download this
    my $IN = IO::File->new_tmpfile;
  2. or download this
    local *OUT;
open OUT, ">output.log";
  3. or download this
    sub callexternalpgm {
  my ( $cmd, $cmdargs, $rawdata, $processeddata, $err ) = @_;
...
  warn $err if $err;
  return 1;
}