Once you're done installing, execute the following command:
mysql -u root -p
You'll be prompted for a password, insert the password and you should see a similar output
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is XXXX
Server version: 5.5.X
Copyright (c) 2000, 2014, Oracle, Monty Program Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.