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An elementary question about execution permissions

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,

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