    # File lib/chef/knife/ssh.rb, line 190
          def read_line
            loop do
              command = reader.readline("#{ui.color('knife-ssh>', :bold)} ", true)

              if command.nil?
                command = "exit"
                puts(command)
              else
                command.strip!
              end

              unless command.empty?
                return command
              end
            end
          end