Script to deregister all ECS Task Definitions in a given region

deregister-task-definitions.sh

#!/usr/bin/env bash

get_task_definition_arns() {
	aws ecs list-task-definitions --region ${AWS_REGION} \
		| jq -M -r '.taskDefinitionArns | .[]'
}

delete_task_definition() {
	local arn=$1

	aws ecs deregister-task-definition \
		--region us-east-2 \
		--task-definition "${arn}" > /dev/null
}


if [ -z "${AWS_REGION}" ] ; then
	(>&2 echo "AWS_REGION is not set")
	exit 1
fi

for arn in $(get_task_definition_arns)
do
	echo "Deregistering ${arn}..."
	delete_task_definition "${arn}"
done