Hass.io, recover config files from cli

Source: https://community.home-assistant.io/t/edit-configuration-yaml-with-hass-io-cli/100421/9

1. login to get out of hassio cli and into bash
2. docker ps to get a list of containers
3. note the first 3 characters or so of the container for homeassistant - for me it was 51a
4. docker exec -it 51a /bin/bash
5. ls to make sure configuration.yaml is there
6. vi configuration.yaml to edit the file
7. edit your mistake
8. esc + :wq to save and exit
9. exit then login to get back to hassio CLI
10. homeassistant check to make sure the conf is right this time
11. homeassistant restart