Findutils / mv

[Patrik Kullman]

Hey,

I just reflected over why a directory structure can't "complete" an
already existing, equally built, directory structure.

Example:
dir1
 -> subdir1
     -> file 1,2,3,4
 -> subdir2
     -> file 1,2,3,4

dir2
 -> subdir1
     -> file 1,2,3,4
 -> subdir2
     -> file 1,2,3,4


I can't seem to merge these two.
(I solved it by: cp -Rf dir1/* dir2; rm -rf dir1)

Why is this?