MySQL: Change root password in Mac

Step 1.

$ sudo /usr/local/mysql/bin/mysqld_safe –user=root & 
//start MySQL(Also, can start MySQL in System Preferences)

Step 2.

$ sudo /usr/local/mysql/bin/mysqladmin -uroot password yourpassword 
//set MySQL password to yourpassword（Attention: this command used when there is no password the first time）

OR

Step 2.

$ sudo /usr/local/mysql/bin/mysqladmin -uroot -pyourCurrentpassword password yourNewpassword 
//change MySQL password to yourNewpassword（Attention: this command used to change the current password）