brew doctor brew update brew install mysql unset TMPDIR mysqld -initialize --verbose --user=whoami --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp
(only use this last one for El Capitan)
mysql.server start brew services start mysql
Successfully executed thanks to http://stackoverflow.com/questions/34345726/brew-install-mysql-on-mac-os-el-capitan