How can we use shutdown command other than a superuser

hi I am using Linux fedora core 3. I want to shutdown the system from .bash_profile file using cd /sbin ./shutdown -g o but when I run the file otherthan a superuser it is giving error message as " to run "shutdown" u must be a root" but i want to execute shutdown command as a non root user (Ex: guest) Even i have used command for changing the ownership as chown "guest" /root -R Still it is giving error. Is there any other way to shutdown other than .bash_profile from user "guest". How can i give full permissions to my user "guest" as equal as "root" ,so that i can run "shutdown" command. Thanks in advance Regards M.Harshavardhan Reddy