我是小白，大佬勿喷
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mysql 输入show databases 没反应

一句话
不要忘记使用MySQL时在命令后加;哦
* * *
在Linux输入以下命令
mysql
终端显示以下文本

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.26-0ubuntu0.18.04.1 (Ubuntu)
Copyright (c) 2000, 2019, 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>

输入show databases

mysql> show databases
    ->

原因是没有在databases后加;
输入show databases;看以下效果

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
4 rows in set (0.00 sec)

所以不要忘记使用MySQL时在命令后加;哦