add sudoers

sed -i '/username/d' /etc/sudoers
sed -i '$d' /etc/sudoers
sed -i "$ a lt32806 ALL=(ALL) ALL" /etc/sudoers

chmod u+w /etc/sudoers
sed -i 's/# %wheel ALL=(ALL) ALL/%wheel ALL=(ALL) ALL/' /etc/sudoers
chmod u-w /etc/sudoers
cat /etc/sudoers
gpasswd -a username wheel                                 or          usermod -aG wheel username

gpasswd wheel -d username

cat /etc/pam.d/su
grep wheel /etc/group

cat /etc/sudoers
gpasswd wheel -d username