Delete AWS EBS Snapshot that older than a year. Deleted EBS are checked before deletion by checking the AWS EBS volume is deleted or not exist to prevent any disastrous face palm in your AWS account

delete_ebs_snapshot.sh

#!/bin/bash

ACCOUNT_ID=$1
if [[ -z ${ACCOUNT_ID} || -s ${ACCOUNT_ID} ]]; then
  echo "How to use this script?"
  echo "./delete_ebs_snapshot.sh <AWS_ACCOUNT_ID>"
  exit 1
fi

if [[ ! $(command -v jq) ]]; then echo "Please install jq"; fi
if [[ ! $(command -v aws) ]]; then echo "Please install awscli"; fi

SNAPSHOTS="aws-describe-snapshot.json"
if [[ ! -f ${SNAPSHOTS} ]]; then
  echo "Generating JSON from your AWS EBS Snapshot from your account"
  aws ec2 describe-snapshots --owner-ids ${ACCOUNT_ID} --output json > ${SNAPSHOTS}
fi

A_YEAR_AGO=$(expr $(date +%s) - 31536000)
for counter in $(seq 0 $(cat ${SNAPSHOTS} | jq '.Snapshots | length')); do
  VOLUME_ID=$(cat ${SNAPSHOTS} | jq .Snapshots[${counter}].VolumeId | tr -d '"')
  SNAPSHOT_ID=$(cat ${SNAPSHOTS} | jq .Snapshots[${counter}].SnapshotId | tr -d '"')
  SNAPSHOT_DESC=$(cat ${SNAPSHOTS} | jq .Snapshots[${counter}].Description | tr -d '"')
  SNAPSHOT_CREATION_TIME=$(cat ${SNAPSHOTS} | jq 'select(has("OwnerAlias") | not)' | jq .Snapshots[${counter}].StartTime | tr -d '"')
  if [[ ! -s ${SNAPSHOT_DESC} && ! -z ${SNAPSHOT_DESC} && ${SNAPSHOT_DESC} != "null" ]]; then
    if [[ ! $(aws ec2 describe-volumes --volume-ids ${VOLUME_ID} 2&>1 /dev/null) ]]; then
      if [[ ${SNAPSHOT_CREATION_TIME} -lt ${A_YEAR_AGO} ]]; then
        echo "Deleting ${SNAPSHOT_ID} since created in $(echo ${line} | awk '{print $5}')"
        aws ec2 delete-snapshot --snapshot-id ${SNAPSHOT_ID} 2&>1 /dev/null  # quiet mode
      fi
    fi
  fi
done