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Then it is *very* important to set the permissions on this file.

   chmod 600 $HOME/.my.cnf

This will keep anyone from reading the contents of the file (which contains your 
database password). Then you should be able to log in directly with the mysql
command line client.  Some sample commands are shown, but it is assumed that
you will read the MySQL documentation and know what you are doing.

   # mysql
   Welcome to the MySQL monitor.  Commands end with ; or \g.
   Your MySQL connection id is 1742668 to server version: 4.1.20-standard-log

   Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

   mysql> \s                             # show connection status
   mysql> show databases;                # show what databases defined
   mysql> show processlist;              # show all connections to the database
   mysql> show tables;                   # show all tables in this database
   mysql> use username_test;             # change to another database
   mysql> show tables;                   # show all tables in this database