Installation:
git clone --depth 1 https://github.com/dagelf/dockertags
dockertags/install.sh
List all tags for a Docker image on docker hub.
List all tags for ubuntu:
dockertags ubuntu
List all php tags containing apache:
dockertags php apache
List all mariadb tags in one line:
echo `dockertags mariadb`
dependencies: wget, awk
source: stackoverflow: How do you list all tags for a Docker image on a remote registry?