monitor.sh

#!/bin/bash

fetch ()
{
    site=$1
    echo Trying to fetch $site...
    timeout 25 wget -O /dev/null -q $site
}

test_if_up ()
{
    fetch  www.google.com
    if [[ $? == "0" ]]
    then
        echo Okay, so your internet is working...
        SITE=$1
        EMAIL=$2
        if [[ ! -f ~/"$SITE"_delete_me ]]
        then
            fetch $SITE
            if [[ $? -ne "0" ]]
            then
                echo Sleeping for 30 seconds and then trying again...
                sleep 30
                fetch $SITE
                if [[ $? -ne "0" ]]
                then
                    echo "Site is down!" | mailx -s "$SITE down!" $EMAIL
                    touch ~/"$SITE"_delete_me
                fi
            fi
        else
            fetch $SITE
            if [[ $? = "0" ]]
            then
                echo "Site is backup again!" | mailx -s "$SITE back up!" $EMAIL
                rm ~/"$SITE"_delete_me
            fi
        fi
    fi
}

#-----------------------------------
# ADD WEBSITES BELOW
#-----------------------------------
test_if_up example.com [email protected]