private String handleConv(String cmd) {
        String[] arg = cmd.split("\\s+");
        if (arg.length == 1) {
            return " usage: con <file>.[statvar|params|data]\n";
        }
        if (arg[1].endsWith("statvar"))  {
            return Convert.statvar(arg[1]);
        } else if (arg[1].endsWith("params")) {
            return Convert.param(arg[1]);
        } else if (arg[1].endsWith("data")) {
            return Convert.data(arg[1]);
        }
        return " cannot convert: " + arg[1];
    }