# File cli/ruby-debug/commands/set.rb, line 212
      def help(args)
        if args[1] 
          s = args[1]
          subcmd = Subcommands.find do |try_subcmd| 
            (s.size >= try_subcmd.min) and
              (try_subcmd.name[0..s.size-1] == s)
          end
          if subcmd
            str = subcmd.short_help + '.'
            str += "\n" + subcmd.long_help if subcmd.long_help
            return str
          else
            return "Invalid 'set' subcommand '#{args[1]}'."
          end
        end
        s = %{
          Modifies parts of the ruby-debug environment. Boolean values take
          on, off, 1 or 0.
          You can see these environment settings with the \"show\" command.

          -- 
          List of set subcommands:
          --  
        }
        for subcmd in Subcommands do
          s += "set #{subcmd.name} -- #{subcmd.short_help}\n"
        end
        return s
      end