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mac安装mysql后，启动mysql error 2002(hy000)错误解决办法
安装mac版的mysql后，启动mysql 报错：
error 2002 (hy000): can’t connect to local mysql server through socket ‘/var/lib/mysql/mysql.sock’ (2)
google了一下发现很多人遇到，解决方法都各不相同，于是去查了下安装包中的readme，里面说的很清楚了：
after the installation, you can start up mysql by running the following
commands in a terminal window. you must have administrator privileges
to perform this task.
if you have installed the startup item, use this command:
shell> sudo /library/startupitems/mysqlcom/mysqlcom start
     (enter your password, if necessary)
     (press control-d or enter exit to exit the shell)
if you don't use the startup item, enter the following command sequence:
shell> cd /usr/local/mysql
     shell> sudo ./bin/mysqld_safe
     (enter your password, if necessary)
     (press control-z)
     shell> bg
     (press control-d or enter exit to exit the shell)
you should be able to connect to the mysql server, for example, by
running `/usr/local/mysql/bin/mysql'.
完成上面的命令后，启动mysql成功
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