Percona 5.6 警告訊息 command line interface can be insecure 修復

Percona MySQL 升級到 5.6 後, 於 CLI 命令列若有輸入密碼, 都會出現下述警告訊息:

Warning: Using a password on the command line interface can be insecure.

註: mysql -u root -pPASSWORD 或 mysqldump -u root -pPASSWORD 都會出現此訊息.

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