-Centos 6
log as root user first:
#visudo
find allow root to run any command anywhere and add user the same root have.
## Allow root to run any commands anywhere
root ALL=(ALL) ALL
abc ALL=(ALL) ALL
save and exit
-Debian7:
log as root user first:
#apt-get install sudo
#vim /etc/sudoers
just uncomment on
%sudo ALL=(ALL:ALL) ALL
save and exit.
then add user to group sudo is done.
#vim /ect/group
and add more user with(,) between other user
sudo:x:27:abc,cde