EC2 tag version of Bash installed.

gistfile1.txt

#!/usr/bin/env bash

EC2_INSTANCE_ID="`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id`"
EC2_REGION="`wget -q -O - http://169.254.169.254/latest/meta-data/placement/availability-zone | sed 's/.$//g'`"

if ! type "aws" > /dev/null; then
  if ! type "pip" > /dev/null; then
    easy_install pip
  fi
  pip install awscli
fi

mkdir ~/.aws
cat << EOF >> ~/.aws/config
[profile tag]
output = json
region = $EC2_REGION
aws_access_key_id = $TAG_WRITE_ACCESSKEY
aws_secret_access_key = $TAG_WRITE_SECRETKEY
EOF

aws --profile=tag ec2 create-tags --resources $EC2_INSTANCE_ID --tags Key=bash,Value=`rpm -qa | grep bash`