Bash script to delete IAM users using AWS cli tool

delete_iam_user.sh

#!/bin/bash

#
# @author: Hernan Garcia <hernandanielg@gmail.com>
# https://gist.github.com/hernandanielg/430f3adb8e297f37ef6f0efb45a51bdc
# 
# usage: ./delete_iam_user.sh [options] <user>
# options:
#   -d|--dry-run  dry run mode
#

AWS_CLI_IAM_CMD="aws iam"

list_items() {
  local AWS_CLI_LIST_CMD="$1"
  local AWS_CLI_LIST_QUERY="$2"
  
  $AWS_CLI_IAM_CMD $AWS_CLI_LIST_CMD --user-name $user --query $AWS_CLI_LIST_QUERY --output text
}

remove_items() {
  [[ -z $1 ]] && return 0

  local ITEMS=$1
  local AWS_CLI_DELETE_CMD="$2"
  local AWS_CLI_ITEM_FLAG="$3"

  for item in $ITEMS ;
  do
    local cmd="$AWS_CLI_IAM_CMD $AWS_CLI_DELETE_CMD --user-name $user --$AWS_CLI_ITEM_FLAG $item"

    if [[ $DRY_RUN == true ]]; then
      >&2 echo "[dry-run] $cmd"
      continue
    fi

    >&2 echo "$cmd"
    $cmd
  done
}

usage() {
  >&2 echo "usage: $0 [-d|--dry-run] <user>"
  exit -1
}

unknown_flag() {
  if [ "$OPTERR" = 1 ] && [ "${optspec:0:1}" != ":" ]; then
    >&2 echo "Unknown flag --${OPTARG}" 
    usage
  fi
}

check_user_exists() {
  local user=$1
  if [[ -z $($AWS_CLI_IAM_CMD get-user --user-name $user 2>/dev/null) ]]
  then
    >&2 echo "user not found: $user"
    exit -2
  fi
}

while getopts ":dh-:" optchar; do
  case "${optchar}" in
    -)
      case "${OPTARG}" in
        dry-run)
          DRY_RUN=true
          >&2 echo "dry run mode..." 
          ;;
        help)
          usage
          ;;
        *)
          unknown_flag
          ;;
      esac;;
    d)
      DRY_RUN=true
      >&2 echo "dry run mode..." 
      ;;
    h)
      usage
      ;;
    *)
      unknown_flag
      ;;
  esac
done
shift "$(($OPTIND -1))"

if [ $# -eq 0 ]; then
  usage
fi

user=$1
check_user_exists $user

echo -e "\nUser to be deleted: $user \n"

read -p "Type user name \"$user\" to continue: "
if [ "$REPLY" != $user ]; then
  >&2 echo "Cancelled"
  exit -3
fi
echo

while read listcmd filter deletecmd flag ;
do
  items="$(list_items "$listcmd" "$filter")"

  [[ -z $items ]] && continue

  remove_items "$items" "$deletecmd" "$flag"
done <<EOF
  list-access-keys AccessKeyMetadata[*].AccessKeyId delete-access-key access-key-id
  list-signing-certificates Certificates[*].CertificateId delete-signing-certificate certificate-id
  list-ssh-public-keys SSHPublicKeys[*].SSHPublicKeyId delete-ssh-public-key ssh-public-key
  list-service-specific-credentials ServiceSpecificCredentials[*].ServiceSpecificCredentialId delete-service-specific-credential service-specific-credential-id
  list-mfa-devices MFADevices[*].SerialNumber deactivate-mfa-device serial-number 
  list-mfa-devices MFADevices[*].SerialNumber delete-virtual-mfa-device serial-number 
  list-user-policies PolicyNames[*] delete-user-policy policy-name
  list-attached-user-policies AttachedPolicies[*].PolicyArn detach-user-policy policy-arn
  list-groups-for-user Groups[*].GroupName remove-user-from-group group-name
  get-login-profile LoginProfile.UserName delete-login-profile user-name
  get-user User.UserName delete-user user-name
EOF

Thank you for the script, It's very useful 🚀🚀