Quick and dirty HTTP monitor

is-it-down.sh

#!/bin/bash

if [ $# -ne 1 ]
then
  echo "Usage: $0 {host.fqdn}"
  echo "runs curl against a host until it doesn't"
  exit 1
fi

HOST=$1

while :
do
  RESULT=`curl -I -s ${HOST} | head -n 1`
  if [[ ${RESULT} != *"200"* ]];then
    echo "$(date "+%Y-%m-%d %H:%M:%S") ${RESULT}"
  fi
  sleep 1
done