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  1. or download this
    my $cmdin=gensym;
my $cmdout=gensym;
my $cmderr=gensym;
open3($cmdin, $cmdout, $cmderr, $cmd);
  2. or download this
    my $cmdin=gensym;
my $cmdout=gensym;
my $cmderr=gensym;
open3(\*IN, \*OUT, \*ERR, $cmd);