mynetwork

#!/bin/bash

NETWORK=$(ifconfig | grep inet | grep netmask | grep -v 127.0.0 | gawk '{print $2" "$4}')

IP=$(echo $NETWORK | gawk '{print $1}')
MASK=$(echo $NETWORK | gawk '{print $2}')

if [ $MASK == "255.255.255.0" ]
then
    NET=3
    SUB=1
    DECMASK=24
    HOSTS=".0"
elif [ $MASK == "255.255.0.0" ]
then
    NET=2
    SUB=2
    DECMASK=16
    HOSTS=".0.0"
else
    NET=1
    SUB=3
    DECMASK=8
    HOSTS=".0.0.0"
fi
echo "My details: IP=$IP Mask=$MASK Net=$NET Sub=$SUB"
NETPART=$(echo $IP | cut -d"." -f-$NET)
SEARCH=${NETPART}${HOSTS}
echo "Searching $SEARCH"
OLDIFS=$IFS
IFS="
"

for LINE in $(nmap -sP $SEARCH/$DECMASK | grep -v latency | sed 's/Nmap scan report for /    /')
do
   echo $LINE
   FLAG=$(echo $LINE | grep $NETPART)
   if [ -z "$FLAG" ]
   then 
       continue
   else
       FOUND="$FOUND $LINE"
   fi
done

exit
#######################################
IFS=$OLDIFS
for LINE in $FOUND
do
    FLAG=$(echo $LINE | grep $NETPART)
    if [ -z "$FLAG" ]
    then 
        continue
    else
        HOST=$(echo "$LINE" | sed 's/[\(\)]//g')
        echo "___________________________________"
        echo "Scanning $HOST"
        sudo nmap -O $HOST
    fi
done