# File lib/main/usage.rb, line 193
    def to_s
      set_defaults!
      s = '' 
      each_pair do |key, value|
        next unless(key and value)
        up, down = key.to_s.upcase, key.to_s.downcase
        if value
          s << (upcase ? up : down) << "\n" 
          s << Util.indent(Util.unindent(value.to_s), 2)
          s << eos 
        end
      end
      s
    end