I use this script to create a bunch of fake docker images, so I can test my (upcoming) CLI app for removing them

batchdocker.sh

#!/bin/bash

# Usage: ./batchdocker.sh numberOfDockers prefix
# Example: ./batchdocker.sh 10 example.com
# This will create 10 dockers called example.com/fake1, example.com/fake2 ... example.com/fake10

END=$1
PREFIX=$2

for i in $(seq 1 $END); do 
    docker build --build-arg FAKE_VALUE=FAKE${i} -t ${PREFIX}/fake${i} .;
done

Dockerfile

FROM hello-world

ARG FAKE_VALUE=DEFAULT

ENV FAKE_VALUE=$FAKE_VALUE