Small script to list all tags of a Docker image

From Docker Hub.

docker/imagetags

@@ -0,0 +1,30 @@
+#!/bin/sh
+
+if [ $# -lt 1 ]
+then
+cat << HELP
+
+imagetags  --  list all tags for a Docker image on a remote registry.
+
+EXAMPLE:
+    - list all tags for ubuntu:
+       imagetags ubuntu
+
+    - list all php tags containing apache:
+       imagetags php apache
+
+    - list all tags of RocketChat :
+       imagetags "rocketchat/rocket.chat"
+
+HELP
+fi
+
+image="$1"
+tags=$(wget -q https://registry.hub.docker.com/v1/repositories/"${image}"/tags -O -  | sed -e 's/[][]//g' -e 's/"//g' -e 's/ //g' | tr '}' '\n'  | awk -F: '{print $3}')
+
+if [ -n "$2" ]
+then
+	tags=$(echo "${tags}" | grep "${2}")
+fi
+
+echo "${tags}"