Linux Users and Groups:

RedHat 6.x
Create an admin group, add it to sudo'ers configuration to switch user as super user.
groupadd groupadmin

visudo command, add a line
    %ftsadmin     ALL=(ALL)       ALL

useradd -c 'john doe' -m  jdoe
usermod -aG groupadmin jdoe
passwd jdoe   ## change password