Hi, dear all. $ ls -l /sbin/shutdown -rwxr-xr-x 1 root root 18516 2005-01-04 23:43 /sbin/shutdown The above output shows execution permissions for all users: owner (root), group (root) and other user on the binary file `/sbin/shutdown'. Then why if I try to run that command with: $ /sbin/shutdown -r now , it says: shutdown: you must be root to do that! ? Excuse the very basic question, thanks for replies, Rodolfo