[newbie] The shutdown and halt user

[Ikhlasul Amal]

I met on /etc/passwd that there exist shutdown and halt username. When I
tried to use their feature (shutdown and halt as shell), I got an error
message telling that I had no permission for using shutdown. How can I
set shutdown so certain users/groups are allowed executing it without
having to have root previledge? (I ever met that option on one
configuration dialog -- but, ooppss, forget what it was!)

-- 
@mal
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