:>find ala -ls
395883    4 drwxr-xr-x   5 root     root         4096 Jun 24 12:27 ala
395885    4 drwxr-xr-x   2 root     root         4096 Jun 24 12:27 ala/1
396719    4 drwxr-xr-x   2 root     root         4096 Jun 24 12:27 ala/2
396904    4 drwxr-xr-x   5 root     root         4096 Jun 24 12:15 ala/3
399757    4 drwxr-xr-x   2 root     root         4096 Jun 24 12:15 ala/3/6
399477    4 drwxr-xr-x   2 root     root         4096 Jun 24 12:10 ala/3/5
399763    0 -rw-r--r--   1 root     root            0 Jun 24 12:10 ala/3/5/test
397717    4 drwxr-xr-x   3 root     root         4096 Jun 24 12:10 ala/3/4
399475    4 drwxr-xr-x   2 root     root         4096 Jun 24 12:10 ala/3/4/5

:>rmdir --ignore-fail-on-non-empty -p ala/**/*
rmdir: failed to remove `ala/3/5/test': Not a directory

:>find ala -ls
395883    4 drwxr-xr-x   3 root     root         4096 Jun 24 12:28 ala
396904    4 drwxr-xr-x   3 root     root         4096 Jun 24 12:28 ala/3
399477    4 drwxr-xr-x   2 root     root         4096 Jun 24 12:10 ala/3/5
399763    0 -rw-r--r--   1 root     root            0 Jun 24 12:10 ala/3/5/test