Is Tomcat running?

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Why grep ps, when the pid has been written to the $CATALINA_PID file?

I have a cron‘d checker script which sends out an email when tomcat is down:

kill -0 `cat $CATALINA_PID` > /dev/null 2>&1
if [ $? -gt 0 ]
then
    echo "Check tomcat" | mailx -s "Tomcat not running" [email protected]
fi

I guess you could also use wget to check the health of your tomcat. If you have a diagnostics page with user load etc, you could fetch it periodically and parse it to determine if anything is going wrong.

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