A--change name B--checking for C--check a disk and displays a status
report D--clear command history E--copy one or more files to another
location F--delete a directory and all the subdirectories and files in
it G--display files in specified directory and all
subdirectories H--expand memory I--find file J--fix errors on the
disk K--press a key to resume L--repeat last find M--save
as N--switch to O--lodging 把文件拷贝至其他位置 ( ) 文件查找