A bash script to do grep against AWS IAM users

iam-grep-user.sh

#!/usr/bin/env bash

set -e

AWSCLI_OPTIONS=""

tmpdir="$(mktemp -d "${TMP:-/tmp}/${BASH_SOURCE##*/}.XXXXXXXX")"

on_exit() {
  rm -fr "${tmpdir}"
}

trap on_exit EXIT

if [ -z "$1" ]; then
  echo "$0 [PATTERNS]..." 1>&2
  exit 1
fi

list_users() {
  aws ${AWSCLI_OPTIONS} iam list-users | \
    python -c 'from __future__ import print_function;import json,sys;print("\n".join({u["UserName"] for u in json.loads(sys.stdin.read())["Users"] if "UserName" in u}))'
}

cd "${tmpdir}"

for user in $(list_users); do
  aws ${AWSCLI_OPTIONS} iam list-access-keys --user-name "${user}" > "${user}.json"
  for arg; do
    if grep -i -q "${arg}" "${user}.json" 1>/dev/null 2>&1; then
      cat "${user}.json"
      exit 0
    fi
  done
done

exit 1