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  1. or download this
    open DNS, "ping -l o -n 1 $host >nil|"||die;
  2. or download this
    open( DNS, "ping -l o -n 1 $host >nil|" ) || die $!;
# or
open DNS, "ping -l o -n 1 $host >nil|" or die $!;
  3. or download this
    open my $pipe, '-|', "ping -l o -n 1 $host" or die $!;