ubuntu16.04下，mysql服务相关的命令各种写法

1.查看mysql服务的状态(以下三种写法等效)

sudo service mysql status
/etc/init.d/mysql status
sudo systemctl status mysql.service

2.开启mysql服务(以下三种写法等效)

sudo service mysql start
/etc/init.d/mysql start
sudo systemctl start mysql.service

3.关闭mysql服务

sudo service mysql stop
/etc/init.d/mysql stop
sudo systemctl stop mysql.service

4.重启mysql服务

sudo service mysql restart
/etc/init.d/mysql restart
sudo systemctl restart mysql.service