标题翻译:A Switch of Command

　　One screen of information appears.Atthe bottom of the screen，you will see the following message:Press any key to continue...
　　When you typed the dir command this time，you included the /p switch after the command.A switch modifies the way MS-DOS carries out a command。
　　Generally，a switch consists of forward slash(/) that is followed by one or more letters or numbers.when you used the /p switch with the dir command，you specified that MS-DOS should pause after it displays each screen of directory list information。
　　命令参数
　　在命令提示行键入命令：dir/p这时，显示器显示一屏信息，并在屏幕下方提示：键入任意键将继续显示下一屏信息。
　　这一次，dir命令后带有参数/p。参数决定MS-DOS执行命令的方式。
　　通常，参数由斜杠(/)和随后的一个或多个字母或数字组成。若选用参数/p，
　　则设定MS-DOS在显示满一屏目录列表信息后暂停。