Find IAM user with given AWS Access Key ID

find_user_by_aws_access_key.sh

#!/bin/bash

# Usage: bash find_user_by_aws_access_key.sh SOME_AWS_ACCESS_KEY
# This script finds the user in the account who has a given access key
ACCESS_KEY=$1
for user in `aws iam list-users | jq -r '.Users[].UserName'`; do
  USER=`aws iam list-access-keys --user $user | jq '.AccessKeyMetadata[] | select(.AccessKeyId == "'"$ACCESS_KEY"'")'`
  if [ -n "$USER" ]; then
    echo "$USER"
    exit 0
  fi
done