I am not sure how to fix this:
dyn-72-33-214-45:python mona$ sudo /usr/local/mysql/bin/mysqld stop
2014-09-06 09:49:04 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2014-09-06 09:49:04 22992 [Warning] Setting lower_case_table_names=2 because file system for /usr/local/mysql-5.6.15-osx10.7-x86_64/data/ is case insensitive
2014-09-06 09:49:04 22992 [ERROR] Fatal error: Please read "Security" section of the manual to find out how to run mysqld as root!
2014-09-06 09:49:04 22992 [ERROR] Aborting
2014-09-06 09:49:04 22992 [Note] Binlog end
2014-09-06 09:49:04 22992 [Note] /usr/local/mysql/bin/mysqld: Shutdown complete
I'm using OS X (Yosemite) and this error happened to me when I upgraded from Mavericks to Yosemite. It was solved by using this command
sudo /usr/local/mysql/support-files/mysql.server start