emacs中如何移动文件

mylynx

我在阅读了Learning.Gnu.Emacs.3rd.Edition这本书中第五章Using Dired, the Directory Editor
中Operating on groups of files一节，

Now let's move the ch files we marked into the new directory. We'll use the rename command, R. This command, like the Unix mv command, is used for renaming files and for moving them. Because we have marked more than one file with an asterisk, when we type R, Emacs assumes we mean to move the marked files.

根据提示就可以移动选定文件到指定目录中了，可我试了半天，无法实现移动文件功能，反倒是成了重命名了。而且用c-h f也查不到移动文件的命令。有哪位能实现这个功能呢？能否给个提示呢？