$ mkdir foo foo/bar foo/baz foo/bat
$ cd foo
$ chmod 000 bar
$ ls -al
total 44
drwxr-xr-x 5 marco marco  4096 2012-08-18 22:07 .
drwxr-xr-x 4 marco marco 28672 2012-08-18 22:07 ..
d--------- 2 marco marco  4096 2012-08-18 22:07 bar
drwxr-xr-x 2 marco marco  4096 2012-08-18 22:07 bat
drwxr-xr-x 2 marco marco  4096 2012-08-18 22:07 baz