[testuser@testhost] /tmp$ mkdir ff

[testuser@testhost] /tmp$ cd ff

[testuser@testhost] /tmp/ff$ touch a b c

[testuser@testhost] /tmp/ff$ rm -rf ./
rm: cannot remove directory: ‘./’

[testuser@testhost] /tmp/ff$ ls
a  b  c

[testuser@testhost] /tmp/ff$ rm -rf /tmp/ff

[testuser@testhost] /tmp/ff$ ls

[testuser@testhost] /tmp/ff$ ls ../ff
ls: cannot access ../ff: No such file or directory

[testuser@testhost] /tmp/ff$ cd ..

[testuser@testhost] /tmp$ ls ff
ls: cannot access ff: No such file or directory