Bash TCP port Fuzzer

fuzzer.bash

#!/bin/bash

# SIMPLE FUZZER made for a bash only CTF
# To fuzz UDP port change /dev/tcp for /dev/udp

if [ $# -lt 3 ]
  then
    echo "Usage: bash fuzzer.bash IP PORT SIZE"
    exit
fi

string=$(printf "%$3s")
buffer=$(echo ${string// /A})

exec 3<>/dev/tcp/$1/$2
echo $buffer 1>&3
data="$(cat <&3)"