    # File lib/chef/knife/core/ui.rb, line 194
          def confirm(question, append_instructions=true)
            return true if config[:yes]

            stdout.print question
            stdout.print "? (Y/N) " if append_instructions
            answer = stdin.readline
            answer.chomp!
            case answer
            when "Y", "y"
              true
            when "N", "n"
              self.msg("You said no, so I'm done here.")
              exit 3
            else
              self.msg("I have no idea what to do with #{answer}")
              self.msg("Just say Y or N, please.")
              confirm(question)
            end
          end