reem008.awk

BEGIN { FS="\t" }
{
  for (i=2;i<=NF;i++){
    if(i == NF){
      printf "%s\n", replaceToDummy($i)
    } else {
      printf "%s\t", replaceToDummy($i)
    }
  }
}

function replaceToDummy(col)
{
    if(col=="" || col~"n.d" || col~"nd" || col~"tr" || col~"<" || col~">"){
        return "-99999."
    }
    return col
}