Deregister ECS Task Definitions by family and revision range

task-def-deregister.sh

#!/bin/bash

FAMILY=your-task-def-family-name

# Update ranges to deregister certain revisions.
for VER in {1..100}; do
  # Sleep after 40 calls to reduce AWS ThrottlingException.
  if (( $VER % 41 == 0 )); then
    sleep 10
  fi

  TASK_DEF=$FAMILY:$VER

  # Capture errors and supress logs.
  ERR=$(
    aws ecs deregister-task-definition --task-definition $TASK_DEF 2>&1 > /dev/null
  )

  # If a ThrottlingException occurred, sleep and retry.
  if [[ $ERR == *"ThrottlingException"* ]]; then
    sleep 10
    aws ecs deregister-task-definition --task-definition $TASK_DEF 2>&1 > /dev/null
  fi

  echo "$TASK_DEF - deregistered"
done