http://www.tecmint.com/mysqladmin-commands-for-database-administration-in-linux/
http://www.yolinux.com/TUTORIALS/LinuxTutorialMySQL.html

Show all databases

show databases;

Selecting a database

use database name;

Verify what database you have selected

select database();

Creating a database

create database test;

Deleting a database

drop database test;