#!/bin/bash

# Usage ./updown.sh x.x.x.x

function hostUp() {
    msg="\"$1 is UP\""
    osascript -e "display notification ${msg} with title \"Host UP\""
}

function hostDown() {
    msg="\"$1 is DOWN\""
    osascript -e "display notification ${msg} with title \"Host DOWN\""
}


function is_alive() {
    ping -c 1 $1 > /dev/null
    if [ $? -eq 0 ] ;then
        result=1
    else
        result=0
    fi
}


state=-1

for (( ; ; ))
do
    is_alive $1
    if [ $result -ne $state ]; then
        if [ $result -eq 1 ]; then
            hostUp $1
        else
            hostDown $1
        fi
    fi
    state=$result
    sleep 10
#    echo "infinite loops [ hit CTRL+C to stop]"
done