更新所有的 Docker Images
docker images | awk ‘{print $1}’ | xargs -L1 docker pull
来源： Update all Docker Images at once by stefanXO
docker images \
| awk '$1 !~ /halo9pan/ { printf ("%s:%s\n", $1, $2) }' \
| awk '/^REPOSITORY|/ {next} {print $1}' \
| xargs -L1 docker pull
docker images \ | awk '$1 ~ // {print $3}' \ | xargs -L1 docker rmi
docker images \
| awk '$1 ~ /halo9pan/ {print $1":"$2}' \
| xargs -L1 docker rmi