#!/bin/sh

ID_START=21

while true ; do
    for HOST in "$@" ; do
        DOWN_STATUS="$(isitup "$HOST" | grep 'NO')"
        ! [ -z "$DOWN_STATUS" ] &&
            notify-send "$HOST" "$DOWN_STATUS" -t 0 -u critical -r "$ID_START"
        ID_START=$((ID_START+1))
    done
    sleep 3600
done