How to get a shell in a Docker container?

You can get a shell in a Docker container by using the `exec` command. Here is an example:

```
docker exec -it sh
```

In the above command:

- `docker exec` tells Docker to execute a command in the specified container.

- `-it` option makes sure that you get an interactive terminal.

- `` is the ID or name of your Docker container. You can get the list of your Docker containers by running `docker ps`.

- `sh` is the shell you want to use. Most Docker images are based on Unix/Linux distributions, so `sh` (or `bash`) is typically available. However, if you know that your container has a different shell available, you can use that instead.

Please note that you should replace `` with your actual Docker container ID or name.

If the specified shell (`sh` in this case) is not available in the Docker container, it will show an error. In that case, try to use `bash` or any other shell that may be available in your Docker container.

Remember that for the Docker exec command to work, the Docker container must be running. If it’s not, you will need to start it first with `docker start `.