Gives the list of IPs that are Busy or Open.

available_ip.sh

#!/bin/sh
# Uncomment for debugging
#set -x
pingf(){
    if ping -w 2 -q -c 1 192.168.1."$1" > /dev/null ;
    then
        printf "IP %s is up\n" 192.168.1."$1"
    else
	printf "IP %s is open\n" 192.168.1."$1"
    fi
}
main(){
    NUM=1
    while [ $NUM -lt 255  ];do
        pingf "$NUM" &
        NUM=$(expr "$NUM" + 1)
    done
    wait
}
main