File copying
（重定向自CopyFile）
In the realm of computer file management, file copying is the creation of a new file which has the same content as an existing file.
All computer operating systems include file copying provisions in the user interface, like the command, "cp" in Unix and "copy" in MS-DOS; operating systems with a graphical user interface, or GUI, usually provide copy-and-paste or drag-and-drop methods of file copying. File manager applications, too, provide an easy way of copying files.