mysql命令行输入密码屏蔽警告问题"Warning: Using a password on the command line interface can be insecure."

直接使用命令登录，屏蔽错误信息

由于告警信息是标准错误，我们可以将标准错误的输出信息输出为空

mysql -uroot -p1234567 2>/dev/null

[root@localhost ~]# mysql -uroot -p1234567 2>/dev/null
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 36
Server version: 5.7.18-log Source distribution
Copyright (c) 2000, 2017, 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.
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