The shell function to list Docker image tags. It depends on https://github.com/genuinetools/reg .

dctag.sh

dctag() {
  if [ $# -eq 0 -o "$1" = "help" -o "$1" = "--help" -o "$1" = "-help" ]; then
    cat << EOS
List Docker image tags
Usage: $ dctag <image name>
ex. $ dctag alpine
EOS
    return 0
  fi
  if [ $# -ne 1 ]; then
    cat << EOS >&2
Too many arguments
For help, please run 'dctag help'
EOS
    return 1
  fi
  reg tags "$1" | grep ".*\..*" | sort -rV
}