Small utility to check hosts on your network with nmap. Very simple and handful for me.

livehosts

#!/bin/bash

if [ -z $1 ]
then
    echo "type livehosts network [port]"
    exit -1
fi;

if [ -z $2 ]
then
    echo "hosts found on network: "$1
    nmap -n -sP $1 | grep report | awk '{print $5}'
    exit 0
fi;

echo "hosts found on network: "$1
echo "with port: "$2

nmap -oG /tmp/outputfile.txt  -T4 -F $1 > /dev/null
grep $2'/open' /tmp/outputfile.txt | awk '{print $2}'