CentOS create a user and into wheel group,then let the user can using sudo command

CentOS create a user and into wheel group,then let the user can using sudo command

#create user

$ useradd username

#change user password

$ passwd

#open wheel group power

$ visudo

%wheel     ALL=(ALL)    ALL

#change user group

$ usermod -g wheel username

#remove user

$ userdel -r username

Reference
http://blog.cycu.edu.tw/migasun/2011/03/howto-linux-add-user-to-group/
http://serverfault.com/questions/58378/add-new-user-with-root-access-in-linux
http://linux.vbird.org/linux_basic/0410accountmanager/0410accountmanager.php
http://www.cyberciti.biz/faq/linux-remove-user-command/