# File cli/ruby-debug/commands/frame.rb, line 180
      def help(cmd)
        s = if cmd == 'where'
          %{
            w[here]\tdisplay stack frames
            }
            else
          %{
            bt|backtrace\t\talias for where - display stack frames
         }
            end
        s += %{
Print the entire stack frame. Each frame is numbered, the most recent
frame is 0. frame number can be referred to in the "frame" command;
"up" and "down" add or subtract respectively to frame numbers shown.
The position of the current frame is marked with -->.  } 
      end