jth@reina:~/tmp/t$ ls -l
total 8
dr--r--r-- 2 jth jth 4096 2008-09-26 06:42 r
d--x--x--x 2 jth jth 4096 2008-09-26 06:42 x

jth@reina:~/tmp/t$ ls r
ls: cannot access r/file: Permission denied
file

jth@reina:~/tmp/t$ ls x
ls: cannot open directory x: Permission denied

jth@reina:~/tmp/t$ cat r/file
cat: r/file: Permission denied

jth@reina:~/tmp/t$ cat x/file
contents of x/file