mac Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) code example

Example 1: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

sudo chown -R _mysql:mysql /usr/local/var/mysql

sudo mysql.server start

Example 2: can't connect to local mysql server through socket '/tmp/mysql.sock' (2)

Try to start the MySQL server:
mysql.server start

Example 3: Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

ln -s /private/var/mysql/mysql.sock /tmp/mysql.sock