MySQL命令行-u -p登陆时，会出现标黄字体的这种警告
[root@mysql02 ~]# mysql -uroot -p123456
一般有这几种方式解决：
1.将密码写入到主配置文件中
[root@localhost ~]# vim /etc/my.cnf [mysqldump] user=root password=123456 [mysql] user=root password=123456
直接使用命令登录，再也无需输入账号密码
[root@mysql02 ~]# mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 8.0.20 MySQL Community Server - GPL Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved. 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>
2.自动配置MYSQL密文密码
[root@localhost ~]# mysql_config_editor set --user=root --host=localhost --port=3306 --password Enter password: 输入密码
该操作会在用户家目录下生成一个隐藏文件".mylogin.cnf"，里面记录了MYSQL的密文的密码，只要配置了以后，也是直接使用命令登录，无需输入账号密码了，如果想要取消，删除此文件即可
3.直接使用命令登录，屏蔽错误信息
[root@localhost ~]# mysql -uroot -p123456 2>/dev/null Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 8.0.20 MySQL Community Server - GPL Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved. 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>
4.使用常量
将密码设置为常量
export MYSQL_PWD=<password>
不清楚为什么必须要用MYSQL_PWD，用自定义就不行
使用如下，一般针对脚本：
[root@mysql02 ~]# export MYSQL_PWD=123456 [root@mysql02 ~]# mysql -uroot Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 9 Server version: 8.0.20 MySQL Community Server - GPL Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved. 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>
这种方式就不用设置-p参数
脚本中也可以这样写。