```docker rmi the_image```

Remove all images

```docker rmi $(docker images -qf "dangling=true")```

Kill containers and remove them:

```docker rm $(docker kill $(docker ps -aq))```

Note: Replace kill with stop for graceful shutdown

Remove all images except "my-image"

```docker rmi $(docker images | grep -v 'ubuntu\|my-image' | awk {'print $3'})```

Or (without awk)

```docker rmi $(docker images --quiet | grep -v $(docker images --quiet ubuntu:my-image))```