Do you want a way to scan your websites for malware?  Sucuri.net has a free website malware scanner.  You can subscribe to their service which will monitor your sites for you and they will even clean up the site if it becomes infected.  But I can do the cleanup myself and thus just wanted something to monitor a group of websites for me and notify me of any compromises.

So, I threw together this little bash script that uses their website to tell me if any of my sites have been compromised.  I'm not a bash expert so it is pretty rudimentary but does the job.  I set up a cron job to run every 4 hours and it emails me if Sucuri has detected any malware on my sites.  

#!/bin/bash
EMAIL="
 This email address is being protected from spambots. You need JavaScript enabled to view it.
 "

#add your websites here
sites[0]="google.com"
sites[1]="bing.com"
sites[2]="yahoo.com"
#sites[3]=""
#sites[4]=""
#...
SENDEMAIL=0
for s in "${sites[@]}"
do
	WARNING=0
	> /tmp/malwarecheck.txt
	lynx --dump http://sitecheck.sucuri.net/results/$s | sed -n "/Security report/,/Spam/p" >> /tmp/malwarecheck.txt
	while read line; do
		if [[ "$line" == *error* ]]
		then
			WARNING=1
		fi
	done < /tmp/malwarecheck.txt
	if [ $WARNING -eq 1 ]
	then
        	SENDEMAIL=1
		echo "http://sitecheck.sucuri.net/results/$s:" >> /tmp/malwarecheckemail.txt
		cat /tmp/malwarecheck.txt >> /tmp/malwarecheckemail.txt
		echo "" >> /tmp/malwarecheckemail.txt
		echo "" >> /tmp/malwarecheckemail.txt
	fi
done
if [ $SENDEMAIL -eq 1 ]
then
	mail -s "URGENT: Malware detected!" $EMAIL < /tmp/malwarecheckemail.txt
fi
rm /tmp/malwarecheck.txt  2> /dev/null
rm /tmp/malwarecheckemail.txt 2> /dev/null