#!/bin/bash

curl 'http://download.savannah.gnu.org/releases/avrdude/' 2> /dev/null | \
  tr '"' '\n' | \
  grep '^avrdude-[0-9.]\+\.tar\.gz$' | \
  sed 's|^avrdude-\([0-9.]\+\)\.tar\.gz$|\1|' | \
  sort -V | \
  tail -n1