A simple, naive bash script to clear out intermediate docker images after building one.

docker-clear.sh

#!/bin/bash
# Inspired by nnsense's answer at https://forums.docker.com/t/how-to-remove-none-images-after-building/7050/16
if [ $# -ne 1 ]; then
    echo "You must enter a single valid image id or name."
else
    # Assume that the image id/name is actually valid.
    docker save --output /tmp/image.tar $1
    docker image rm $1
    docker image prune  # Just an extra cleanup step while we're at it.
    docker load --input /tmp/image.tar
fi