LINUX How to create an admin user

1 Create an admin user. 
[root@dlp ~]#useradd cent
[root@dlp ~]#passwd cent
Changing password for user cent.
New UNIX password:
# set password
Retype new UNIX password:
# Confirm
passwd: all authentication tokens updated successfully.
[root@dlp ~]#exit
# logout
2 Try to switch to a user that was added above
dlp login:cent
# input user name
password:
# password
[cent@dlp ~]$su -
# switch to root
Password:
# root password
[root@dlp ~]#
# just switched to root
3 Make a user (it's 'cent' in this example) be only a user who can switch to root 
  as an administration user. 
[root@dlp ~]#usermod -G wheel cent
[root@dlp ~]#vi /etc/pam.d/su
#%PAM-1.0
auth sufficient pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth sufficient pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.

# uncomment the following line
auth required pam_wheel.so use_uid
auth include system-auth
account sufficient pam_succeed_if.so uid = 0 use_uid quiet
account include system-auth
password include system-auth
session include system-auth
session optional pam_xauth.so
4 Configure that forwarding emails for root to administration user you set above.
[root@dlp ~]#vi /etc/aliases
# Person who should get root's mail
# last line: uncomment and change to a user
root:cent
[root@dlp ~]#newaliases
# Configuration change

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