$ ls -al
total 16
drwxr-xr-x   4 gsson  gsson   512 Apr 20 21:21 .
drwxr-xr-x  21 gsson  gsson  1536 Apr 20 21:20 ..
d--x--x--x   2 gsson  gsson   512 Apr 20 21:21 a
dr-xr-xr-x   2 gsson  gsson   512 Apr 20 21:19 b
$ ls -al a
ls: a: Permission denied
$ ls -al b 
total 8
dr-xr-xr-x  2 gsson  gsson  512 Apr 20 21:19 .
drwxr-xr-x  4 gsson  gsson  512 Apr 20 21:21 ..
$ cd a
$ pwd
/home/gsson/a/a
$