pixelSEVENTY2 - ShellScriptWebSiteMonitor

Shell Script Web Site Monitor

A (very) rudimentary shell script to monitor a web site and do something in the event of failure and recovery - run it from a cron job. Create a text file on the site you want to monitor that just includes the word "UP". This script will send an email after 3 consecutive failures, and another email upon recovery.

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#! /bin/sh

# number of times to test before failing
FAIL_COUNT=3

#page to test
STATUS_PAGE=http://www.some_website.com/status.txt

# email address to send notification to
EMAIL_ADDRESS=my_email_address


touch status.chk
if [ "`curl $STATUS_PAGE | grep "UP" | wc -l`" == "1" ] ; then
        if [ "`grep "DOWN" status.chk | wc -l`" != "0" ] ; then
                echo "Recovered at `date`" >> status.log
                echo "Site ($STATUS_PAGE) recovered at `date`" | mail -s "Site Recovered" $EMAIL_ADDRESS
        fi
        > status.chk
else
        echo `date` >> status.chk
        if [ "`cat status.chk | wc -l`" == "$FAIL_COUNT" ] ; then
                echo "DOWN" >> status.chk
                echo "Failed at `date`" >> status.log
                echo "Site ($STATUS_PAGE) down at `date`" | mail -s "Site Down" $EMAIL_ADDRESS
        fi
fi