Ping mashine with nbtscan

#!/bin/bash
#WORK ON DEBIAN BASE SYSTEM!
#CHECK USER IS ROOT OR NOT
if [ $UID -ne 0 ];then
        echo "Must run with root privileg!!!"
        exit
fi

#GET NETWORK INTERFACE
network=$(ifconfig | sed '1!d' | cut -d" " -f1)

#CHECK NETWORK INTERFACE IS ADD TO PARAM IN SCRIPT
if [ "$#" -ne 1 ];then
echo "Usage - ./ping.sh $network"
exit
fi

#CHECK NBTSCANEXISTS OR NOT
test `which nbtscan` || \
echo -e "Error nbtscan not exists\nTry to install!!!" `apt-get install nbtscan` >> /dev/null

interface=$1
echo "The interface is $interface"

prefix=$(ifconfig $interface | grep "inet addr" | cut -d ":" -f2 | cut -d " " -f1 | cut -d"." -f1-3)
echo "------------------------------------------------------------"
for addr in $(seq 1 254);do
nbtscan $prefix.$addr | grep -E "server" | awk -F" " '{printf "%-15s %-20s %s\n", $1,$2,$NF}' &
done