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  1. or download this
    my $Err;
BEGIN { $Err= defined $ENV{SM} }
  2. or download this
    my $Err= 0;
BEGIN { $Err= 1   if  ! $ENV{SM}  }
  3. or download this
    my $Err;
$Err= 1   if  ! $ENV{SM};
$Err= 0;