read Permissions on a Directory: Example (continued 1)

• Try to change that directory's permissions

        $ chmod 0711 /tmp/explain-read/
        chmod: /tmp/explain-read/: Operation not permitted

• Oops! Must sudo or be root

        $ sudo chmod 0711 /tmp/explain-read/

• Regular user can no longer see directory's contents

        $ ls -l /tmp/explain-read/
        total 0
        ls: /tmp/explain-read/: Permission denied