Port sweep

Quick and dirty portsweep script:

#!/bin/sh

if [ "$1" == "" ] || [ "$2" == "" ]
then
echo "./port_scan.sh [hostlist_file] [port]"
else

for host in `cat $1`
do
echo "scanning $host"
nmap -oG $host-$2.out -v $host/24 -p$2 -P0
done

grep open *$2.out | cut -d" " -f2 > $2.lst
fi

*.lst contains a list of IPs only.