CentOS 6
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Create a User
2014/08/01
[1] Create a common user account.
[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 ~]#
# 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 the email forwading settings. For example, if you'd like to forward emails for root account to another user, set like follows.
[root@dlp ~]#
vi /etc/aliases
# Person who should get root's mail
# end of the file: uncomment and change to a user

root:
cent
[root@dlp ~]#
# reload

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