docker search centos 

NAME                                         DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
centos                                       The official build of CentOS.                   7249      [OK]       
kasmweb/centos-7-desktop                     CentOS 7 desktop for Kasm Workspaces            22                   
continuumio/centos5_gcc5_base                                                                3                    
dokken/centos-7                              CentOS 7 image for kitchen-dokken               2                    
dokken/centos-stream-9                                                                       1                    
couchbase/centos7-systemd                    centos7-systemd images with additional debug…   1                    [OK]

curl https://registry.hub.docker.com/v1/repositories/centos/tags\
| tr -d '[\[\]" ]' | tr '}' '\n'\
| awk -F: -v image='centos' '{if(NR!=NF && $3 != ""){printf("%s:%s\n",image,$3)}}'


centos:latest
centos:5
centos:6
centos:6.10
centos:6.6
centos:6.7
centos:6.8
centos:6.9
centos:7


多行 用 \  换行

tr用来转换或者删除一段文字   translate or delete characters
tr 可视为 sed 的 一个极简实现


 docker pull centos:7
7: Pulling from library/centos
Digest: sha256:c73f515d06b0fa07bb18d8202035e739a494ce760aa73129f60f4bf2bd22b407
Status: Image is up to date for centos:7
docker.io/library/centos:7


docker pull centos:7.2
Error response from daemon: manifest for centos:7.2 not found: manifest unknown: manifest unknown

docker images
REPOSITORY   TAG       IMAGE ID       CREATED        SIZE
busybox      latest    3c19bafed223   6 weeks ago    1.41MB
centos       7         c9a1fdca3387   5 months ago   301MB