# docker pull [imageName]:[tagName]
docker pull nginx
docker pull nginx:lastest
docker pull nginx:alpine # 안정판

# docker image rm [imageId]
docker image rm d12
# imageId는 3자리 이상만 기입해도 된다

# docker image rm -f [imageId]
docker image rm -f d12

# docker image rm -f $(docker image -q)
docker image rm -f $(docker image -q)

# docker image ls
docker image ls