hostname# cd /var/tmp/
hostname# ls -la
total 12
drwxrwxrwt  3 root     root  4096 Oct  6 04:00 .
drwxr-xr-x  3 username users 4096 Apr 14  2006 . 
drwxr-xr-x 29 root     root  4096 Oct  1 13:56 ..

hostname# cd .
./  . / ../