private static String quoteArg(String arg) {
    String specials = " #'\"\n\r\t\f";
    if (!StringUtil.containsAnyChar(arg, specials)) {
      return arg;
    }

    @NonNls StringBuilder sb = new StringBuilder(arg.length() * 2);
    for (int i = 0; i < arg.length(); i++) {
      char c = arg.charAt(i);
      if (c == ' ' || c == '#' || c == '\'') sb.append('"').append(c).append('"');
      else if (c == '"') sb.append("\"\\\"\"");
      else if (c == '\n') sb.append("\"\\n\"");
      else if (c == '\r') sb.append("\"\\r\"");
      else if (c == '\t') sb.append("\"\\t\"");
      else if (c == '\f') sb.append("\"\\f\"");
      else sb.append(c);
    }
    return sb.toString();
  }
private static String quoteArg(String arg)