root@recluse:~/foo# tree
.
|-- bar
|   `-- baz.doc
|-- baz
|   |-- foo.doc
|   `-- quux
`-- quux.doc

3 directories, 3 files
root@recluse:~/foo# find . -name *.doc
./quux.doc
root@recluse:~/foo# mv quux.doc quux.doc.old
root@recluse:~/foo# find . -name *.doc
./bar/baz.doc
./baz/foo.doc