PATH="$PATH":/usr/local/mysql/bin
mysql -u root -p
#輸入密碼
#Terminal顯示
#Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 5.7.12

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Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>SET PASSWORD = PASSWORD('new password');