Mysql

mysql --user=$USERNAME -p
 
# backup
mysqldump --user=$USERNAME -p $DATABASE > $SQLFILE
# restore
mysql --user=$USERNAME -p $DATABASE < $SQLFILE

Useful commands

SHOW DATABASES;

CREATE USER 'user'@'localhost' IDENTIFIED BY 'password';

CREATE DATABASE database;

GRANT ALL PRIVILEGES ON db.* TO 'user'@'localhost' WITH GRANT OPTION;

REVOKE ALL PRIVILEGES ON *.* FROM 'user'@'localhost';

DROP DATABASE db;

DROP USER user;