#!/bin/bash


function helpexit() {
    echo "Print your public internet IP address."
    echo "-n  return as host name."
    exit
}
for (( i=1; i<=$#; i++ )); do
  [[ "${!i}" = "--help" ]] && helpexit                                            
  [[ "${!i}" = "-h" ]] && helpexit                                            
  [[ "${!i}" = "-n" ]] && { NAME=1; continue; }
done                       


IP=$( dig +short myip.opendns.com @resolver1.opendns.com )

if [[ "$NAME" -eq 1 ]]; then 
  output=$( dig +short -x "$IP" )
else
  output="$IP"
fi

if [[ -z "$output" ]]; then
  exit 1
fi
echo "$output"