List all the tags for a given image at the Docker hub

hub-tags.sh

#!/bin/sh

# Inspired by: https://stackoverflow.com/a/43262086, tested on Ubuntu and Alpine

if [ -z "$1" ]; then
    echo "You have to provide an image name!"
    exit
fi

if [ -z "$(echo "$1" | grep -o '/')" ]; then
    hub="https://hub.docker.com/r/library/$1/tags/"
else
    hub="https://hub.docker.com/r/$1/tags/"
fi

resp="Page Not Found"
if [ -z "$(command -v curl)" ]; then
    resp=$(wget -q -O - $hub)
else
    resp=$(curl -sL $hub)
fi
err=$(echo "$resp"|grep -o "Page Not Found")

if [ -n "$err" ]; then
    echo "Cannot find image $1!"
    exit
else
    tags="$(echo "$resp"|sed  -e 's|}|\n|g' -e 's|{|\n|g'|grep '"result"'|sed -e 's|,|\n|g'|cut -d '[' -f2|cut -d ']' -f1|sed  '/"tags":/d'|sed -e 's|"||g')"
    echo $tags
fi