# File lib/whenever/output_redirection.rb, line 8
      def to_s
        return '' unless defined?(@output)
        case @output
          when String   then redirect_from_string
          when Hash     then redirect_from_hash
          when NilClass then ">> /dev/null 2>&1"
          when Proc     then @output.call
          else ''
        end 
      end