flaky.sh

#!/usr/bin/env bash

if [ -z "${1}" ]; then

    echo "usage: ${0} {site uri eg http://google.com}"
    exit 1
fi

curl "${1}" > /dev/null 2>&1

is_down="$?"

if [ ! $is_down -eq 0 ]; then

    echo "site is down"
    # or send some email; sound alarm; etc.
fi