#!/bin/bash
[ $# -ne 1 ] && echo "Usage: $0 <security group id>" && exit 1

SG_ID=$1
MY_IP=$(dig +short myip.opendns.com @resolver1.opendns.com)

aws ec2 authorize-security-group-ingress --group-id ${SG_ID} \
    --ip-permissions IpProtocol=tcp,FromPort=22,ToPort=22,IpRanges="[{CidrIp=${MY_IP}/32,Description='Open 22 port with awscli'}]"