#!/bin/bash
#
# Copyright (C) 2008 vladz <vladz@devzero.fr>
#
# tcp_scanner.sh -- TCP port scanner and banner disclosure in Bash

[ $# -lt 2 ] && \
   { echo "usage: $0 <host_target> <port1> <port2> ..."; exit 1; }

target="$1"; shift ; ports="${@}"; fd=/dev/tcp/${target}

for i in ${ports}
do
   echo -n "Port ${i}: "; read -t3 x &>/dev/null <$fd/$i
   echo ${x-closed.}; unset x
done