and other permissions. • The ACL ”user:penguin:r-x” allows a normal user penguin to have ”r-x” permissions. This enabled ”ls -la” to list directory content. • The ACL ”mask::r-x” sets the upper bound bound of permissions. See ”POSIX Access Control Lists on Linux”, acl(5), getfacl(1), and setfacl(1) for more. 4.7.2 sudo O sudo(8) é um programa desenhado para permitir a um administrador de sistema dar