在写脚本时经常需要在命令行使用明文密码，虽然不安全，但是很方便，出现[Warning] Using a password 就很讨厌，下面给出个解决方式
方法： 使用 2>/dev/null
#mysql --user=root --password=123456 -e "select version()" 2>/dev/null
+-----------+
| version() |
+-----------+
| 8.0.23-14 |
+-----------+
如何消除mysql: [Warning] Using a password on the command line interface can be insecure.
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