Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf /usr/etc/my.cnf ~/.my.cnf

drwxr-xr-x 4 ubuntu ubuntu 4096 Jul 18 02:03 .
drwxr-xr-x 3 root   root   4096 Jul 17 14:06 ..
-rw-r--r-- 1 ubuntu ubuntu  220 Apr  9  2014 .bash_logout
-rw-r--r-- 1 ubuntu ubuntu 3637 Apr  9  2014 .bashrc
drwx------ 2 ubuntu ubuntu 4096 Jul 17 14:09 .cache
-rw-rw-r-- 1 ubuntu ubuntu    0 Jul 17 14:09 .cloud-locale-test.skip
-rw------- 1 ubuntu ubuntu 1004 Jul 18 02:03 .mysql_history
-rw-r--r-- 1 ubuntu ubuntu  675 Apr  9  2014 .profile
drwx------ 2 ubuntu ubuntu 4096 Jul 17 14:06 .ssh