Execute TDengine CLI program `taos` directly from the Linux shell to connect to the TDengine service and enter the TDengine CLI interface, as shown in the following example.

```text
$ taos

taos> show databases;
              name              |
=================================
 information_schema             |
 performance_schema             |
 db                             |
Query OK, 3 rows in database (0.019154s)

taos>
```