If you run the tutorial step-by-step, following error occurs:
```$ sudo docker logs $container_id
Usage: docker logs CONTAINER
Fetch the logs of a container
-f, --follow=false: Follow log output```
This is obviously because bash variables are case-sensitive, so it mustn't be `CONTAINER_ID` above.
Docker-DCO-1.1-Signed-off-by: Mateusz Sulima <sulima.mateusz@email.com> (github: github_handle)
Upstream-commit: dca1c0073f42b0d75e914119eae863d6e6087cd6
Component: engine
fe7021118f