useradd linc -m -s /bin/bash
添加sudoers
su -
vim /etc/sudoers
# Allow members of group sudo to execute any command
%sudo ALL=(ALL:ALL) ALL
rzx ALL=(ALL) NOPASSWD: NOPASSWD: ALL
删除mysql
sudo apt-get remove --purge mysql-*
sudo rm -rf /ect/init.d/mysql