code: private boolean isShortOption(String token) {
          // short options (-S, -SV, -S=V, -SV1=V2, -S1S2)
          if (!token.startsWith("-") || token.length() == 1) {
              return false;
          }
          // remove leading "-" and "=value"
          int pos = token.indexOf("=");
          String name = (pos == -1 ? token.substring(1) : token.substring(1, pos));
          if (options.hasShortOption(name)) {
              return true;
          }
          // check for several concatenated short options
          return (name.length() > 0 && options.hasShortOption(String.valueOf(name.charAt(0))));
      }
docs: Tells if the token looks like a short option.
  
  @param token the command line token to handle
  @return true if the token like a short option