说明：  本文通过几个具体实例详细叙述了MS-DOS方式下几个常用命令的使用，用来解决计算机应用中的问题，为读者遇到类似问题时提供了参考解决方法。
(In this paper, several specific examples described in detail in MS-DOS mode a few commonly used commands, which are used to solve problems in computer applications, for the reader encounter the same problem as a reference solution.)