I would like to make a user super powerful, with almost all root rights but unable to touch a the root user (to change the password of the root). My goal is to user "B" to manage my web server. The problem is user B need to able to run the chown and chmod commands on some files belonging to other users. I tried to put B in root group or use visudo, but it's not enough. I'm working an Centos 6 system. If some body have ideas!