#!/bin/bash

part=0
step=10000

while [ 1 ]; do

  end=$(expr $part + $step)

  GOT=`echo -en "GET /secret_memo.txt HTTP/1.0\nRange: bytes=$part-$end\n\n" | nc 119.70.231.180 80`
  TEST=`echo $GOT | grep "Partial Content"`

  if [ "$?" == "0" ]; then
    echo "PART $part: $GOT"
    part=$end
  fi

done