I threw this together to monitor an intermittent LB issue tonight. It works beautifully.

status_check.sh

#!/bin/bash

# Usage: ./command.sh http://www.google.com
# Help: Returns the HTTP status code for a given URL every 2 seconds

txtred=$(tput setaf 1) # Red
txtgrn=$(tput setaf 2) # Green
txtylw=$(tput setaf 3) # Yellow
txtblu=$(tput setaf 4) # Blue
txtpur=$(tput setaf 5) # Purple
txtcyn=$(tput setaf 6) # Cyan
txtwht=$(tput setaf 7) # White
txtrst=$(tput sgr0)    # Text reset.

while [ 1 ];
do
    response=$(curl -sL -w "%{http_code} %{url_effective}\\n" "$1" -o /dev/null)

    if [[ "$response" == *"200"* ]]
    then
        echo "${txtgrn} $response ${txtrst} - $(date)"
    else
        echo "${txtred} $response ${txtrst} - $(date)"
    fi

    sleep 2;
done

I left the color codes in there in case someone wants to add more later.