删除镜像

#!/usr/bin/env bash

####删除docker镜像，每一个镜像都会保留最新的20个镜像，其余的删除。

export image_name_list=`docker images | awk '{print $1}' | sed '1d' | sort -u`

for vv in ${image_name_list[@]};do

    echo ++++++++++++  begin to delete $vv +++++++++++++++++++

    export name=$vv

    images_list=`echo $passwd | sudo -S docker images | grep $name | awk '{print ENVIRON["name"]":"$2}' | sed '1,20d' | tr '\n' ' '`

    docker rmi $images_list

done