In Bash type "mysql -u (yourmysqlusername) -p" It will prompt you to enter your password. Type "use databasename;" to select your database, then you can run select queries, update, insert, alter, etc.
There are several tools available to manage MySQL both paid and open source/free. Navicat is really a good one but it is paid. You can use MySQL's own Workbench, Toad for MySQL, HeidiSQL and several others. You can find other MySQL GUI tools options here.