Multi layer

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http://forums.fedoraforum.org – Im using fed 18 on i686 yeah never got used to running around in xll with security anyway heres what im wondering I of course have root and then next step down user account with some privlidges then have end user account with very few privlidges i did however notice that su can be used from this last account where i dont want su to be able to be gotten into how do i shut it off ??. also is it safe to assume that sudo is a good beit to use in my first step down account after root?? I pretty much use the first step down account to do updates and add software I dont use it for web br (HowTos)