This is a very hacky bash script to help get a the publicly assigned hostname of an ec2 instance.

get-my-ec2-hostname.bash

#!/bin/bash
### this is a very hacky bash script to help get a the publicly assigned hostname of an ec2 instance.
### it will only work with instances within us-east-1 because we arent checking region, amazonaws suffix, etc.

# Get my public IP
publicIP=$(curl -s whatismyip.akamai.com)

# Make up AWS EC2 host name with public DNS
publicName=ec2-${publicIP//./-}.us-east-1.compute.amazonaws.com

# Echo host name
echo ${publicName}