How to assing allocated free Elastic IP to autoscaling new instance or ec2 instance via template.

Ec2-instance-AutoEIP-Assign-for-whitelistip

#!/bin/sh
# Region in Which instance is running
EC2_REGION='us-east-1'
AWS_ACCESS_KEY='XXXXXXXXXXX'
AWS_SECRET_ACCESS_KEY='XXXXXXXXXXXXXXXXXXX'

#Instance ID captured through Instance meta data
InstanceID=$(/usr/bin/curl -s http://169.254.169.254/latest/meta-data/instance-id)

#Query free Elastic IP and write all allocated ID  aws ec2 describe-addresses --query 'Addresses[?AssociationId==null]' --output text | perl -lne 'print if /(\w+\-){1}\w+/'

aws ec2 describe-addresses --query 'Addresses[?AssociationId==null]' --output text | perl -lne 'print $& if /(\w+\-){1}\w+/' > /opt/EIP/output.txt
Allocate_ID=$(head -n 1 /opt/EIP/output.txt)

#Assigning Elastic IP to Instance
aws ec2 associate-address --instance-id $InstanceID --allocation-id $Allocate_ID