# File sprout/lib/sprout/tasks/tool_task.rb, line 194
    def to_shell
      result = []
      result << @prepended_args unless @prepended_args.nil?
      params.each do |param|
        if(param.visible?)
          result << param.to_shell
        end
      end
      result << @appended_args unless @appended_args.nil?
      return result.join(' ')
    end