Shell script to monitor HTTP server status and email me when the server is not responding.

.serverstatus.sh

#!/bin/bash
NAME=Adam
TESTDATE=`date "+%B %e, %Y"`
TESTTIME=`date "+%H:%M:%S"`

auto_init() {
	runTest
}

runTest() {
	if [[ -z "${SITE}" ]]; then
		echo "You need to set the -s flag to the site URL you wish to test."
		exit 1
	fi
	if [[ -z "${EMAIL}" ]]; then
		echo "You need to set the -e flag to the email address you wish to report errors to."
		exit 1
	fi
	if curl -s --head "${SITE}" | grep "200 OK" > /dev/null 
		then 
			echo "The HTTP server on ${SITE} is up!" > /dev/null 
		else 
			(echo "Subject: The HTTP server on ${SITE} is down
MIME-Version: 1.0
Content-Type: text/html
Content-Disposition: inline
<p>Dear ${NAME},</p>
<p>This is an automated message from your server status script.</p>
<p>The site ${SITE} was tested on <b>${TESTDATE}</b> at <b>${TESTTIME}</b> and returned an error. It would appear that ${SITE} is inaccessible at this time.</p>
<br>
<p>From your friendly servers status script.</p>
") | sendmail ${EMAIL}
	fi
}

toolUsage () {
less << EOF1
Copyright (c) 2013 Adam Merrifield
Source: https://gist.github.com/seyDoggy/5814216

serverstatus

Usage:

	./serverstatus.sh [-h] [-s http://somesite.url] [-e [email protected]]

OPTIONS:
	-h	Show this message
	-s	site URL to test
	-e	email address to report errors to
	
	
EXAMPLES:
	
	./.serverstatus.sh -s http://seydesign.com/ -e [email protected]
		This will test the site seydesign.com and send me an email if it is down.
		Works great as a cron job or launch daemon.
	
EOF1
}

while getopts ":hs:e:" OPTION
do
	case $OPTION in
		h) toolUsage; exit 1;;
		s) SITE="$OPTARG";;
		e) EMAIL="$OPTARG";;
		?) echo "Invalid option or empty value: -$OPTARG"; exit 1;;
	esac
done

auto_init