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打开终端，输入：
vi~/.bash_profile
输入i
然后粘贴以下内容
# mysql
alias mysql=‘/usr/local/mysql/bin/mysql‘
alias mysqladmin=‘/usr/local/mysql/bin/mysqladmin‘
# ls
alias ls=‘ls -G‘
按ESC键
输入：
:wq
重启终端程序
修改MySQL的管理员密码：
mysqladmin -u root -p123456
卸载MySQL：
sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
vim /etc/hostconfig (and removed the line MYSQLCOM=-YES-)
rm -rf ~/Library/PreferencePanes/My*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /var/db/receipts/com.mysql.*
Mac OS X 下MySQL的安装、配置及卸载
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原文地址：http://www.cnblogs.com/iospp/p/5074522.html
