Create user for further logins without sudo askubuntu.com/questions/915585/how-to-login-mysql-shell-when-mysql-have-no-password/1325689#1325689:
sudo mysql -e "CREATE USER $USER"
Create test user with password:
sudo mysql -e 'CREATE USER user0 IDENTIFIED WITH mysql_native_password BY "a"'
sudo mysql -e 'GRANT ALL PRIVILEGES ON database_name.* TO "user0"'
and login as that user:
mysql -u user0 -p
Login with password given on the command line:
mysql -u user0 -pmypassword
The IDENTIFIED WITH mysql_native_password part is to overcome "Client does not support authentication protocol requested by server" when connecting from Node.js.
List users:
sudo mysql -e 'SELECT * FROM mysql.user'
View permissions for each user on each DB: serverfault.com/questions/263868/how-to-know-all-the-users-that-can-access-a-database-mysql
sudo mysql -e 'SELECT * FROM mysql.db'
List databases:
sudo mysql -e 'SHOW DATABASES'
Create database:
sudo mysql -e 'CREATE DATABASE mydb0'
Destroy database:
sudo mysql -e 'DROP DATABASE mydb0'
Show tables in database:
sudo mysql -e 'SHOW TABLES' mydb0
or:
sudo mysql -e 'SHOW TABLES FROM mydb0'
Dude's a legend. Sells company for a few million. Then forks the open source project next year. Love it.

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