myip

#!/bin/bash
set -euo pipefail

if [ $# -ge 1 ] && [ "$1" = "-4" ]; then
  curl_opts=-4
else
  curl_opts=
fi

run() {
    echo >&2 "+ $*"
    "$@"
}

run curl $curl_opts -sS https://www.google.com/search?q=my+ip+address \
    | grep -Eo 'Client IP address: [0-9a-f:\.]+' \
    | awk '{ print $NF }'