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Re: Nmap oprions
From: Jacob Bresciani <jacob () bresciani ca>
Date: Fri, 24 Jun 2005 17:12:05 -0700

Slow but it works. you could make it more complicated but faster by
pinging the machine first to see if it's up then if it's up nmapping it.
or maybe simply telneting to it on port 21 and checking the reply.

###########################################
#!/bin/bash
PORT=21
SUBNET=192.168.0
IP=254
LASTIP=1
until [ $IP -lt $LASTIP ]
 do
 echo scanning $SUBNET.$IP
  ISOPEN=`nmap $SUBNET.$IP -p$PORT | grep open | awk '{print $2}'`
  if [ "$ISOPEN" == "open" ];then
    echo "$SUBNET.$IP is open"
  fi
  echo "$SUBNET.$IP is down"
  let IP-=1
done

On Thu, 2005-06-23 at 10:43 -0700, Juan B wrote:
HI,

I need to scan my big network for port 21 on many
hosts.

I want that nmap will show me just the hosts which the
port found open. I know that I can do this with grep
but im not sure about the syntex.

can some one please help.

thanks.

J

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