The program has two modes. You can copy one file into another. Or copy a file from one place to another.
Copies directories recursively.
Find will search all directories recursively. A hard link to a file is indistinguishable from the original. A hard link has to be on the same filesystem as the original file. A symbolic link may be across filesystems and existing file and new-link may be directories as well as files. This utility depends on a database file with al list of all files on your filesystem.