mdu
mdu功能说明：显示MS-DOS目录所占用的磁盘空间。
语 法：mdu [-as][目录]
补充说明：mdu为mstools工具指令，可显示MS-DOS文件系统中目录所占用的磁盘空间。
参 数：
-a 显示每个文件及整个目录所占用的空间。
-s 仅显示整个目录所占用的空间。
mdu
mdu [option] dir
Display disk usage, in clusters, for a directory and its subdirectories and files on an MS-DOS filesystem. See du and mtools for more information, and see minfo for the cluster size. Only one of -a or -s can be specified.
Options
Show the space used by individual files in a directory as well as the total space.
Show only the total space used.