portscan.sh

#!/bin/sh

HOST=$1
PORTF=$2
PORTT=$3
echo "Scanning $HOST:$PORTF-$PORTT"

for ((PORTF; PORTT >= PORTF; PORTF++)) do
  SVC=`cat /etc/services | egrep "\\s$PORTF/tcp" | awk '{print $1}'`
  nc -z -w 1 -G 2 -d "$HOST" "$PORTF"  || echo "[$PORTF/$SVC] Failed";
done