Solaris Log Monitoring Script

I wrote this script a while back to automate watching our logs.
I don't even know if it still works, but I figured I'd post it here. It may be helpful to someone.

#!/bin/sh
###########################################################
# Log alert file, by Luke MacNeil. 11/09/2005
# This script is meant to be called from cron to monitor
# at whatever interval you like. 

# Summary of features.
#
# checklog reports all new log file entries since its last run.
# it uses a tmp file to hold its history. the tmp file is specified
# by an argument.
#
# usage= checklog /path/to/logfile /path/to/tmpfile
# ex. checklog /var/log/syslog /tmp/syslog.tmp
#
# checkdisk reports the status of the disk -
# usage= call with no arguments.
#

###########################################################
#Initalize Variables
###########################################################

# Path and name of the temporary file used to send the system report
REPORTLOG=/tmp/report.log 

# Set the hostname
HOSTNAME=`hostname` 

# The subject line that will be mailed to you
SUBJECT="Status report for $HOSTNAME" 

# The sender that will be mailed to you
FROM="Automated Reporting System" 

BREAKER="-------------------------------------------------------------------------"
TODAY=`date` #today's date.

###########################################################
touch $REPORTLOG #Create temporary report file.
###########################################################
#Actual log checking function, works on 3 parameters space delimted
###########################################################
checklog(){
	LOGFILE=$1 #Argument 1
	TMPFILE=$2 #Argument 2

	# Grabs the number of lines from the log
	CURRENTCOUNT=`awk 'END { print NR }' $LOGFILE` 

	echo ""
	echo "Preparing System Log Differential Report for $LOGFILE"
	# If tmp file doesnt exist create it.
	# If it does, get the previous count.
		if [ -f $TMPFILE ]
			then
				TMPCOUNT=`cat $TMPFILE`
			else
				echo "Creating Temp File $TMPFILE"
				echo "$CURRENTCOUNT" > $TMPFILE
				TMPCOUNT=`cat $TMPFILE`
		fi 

	###Compare counts.
	echo "Comparing...."
	echo "Old Count = $TMPCOUNT"
	echo "New Count = $CURRENTCOUNT"

	if [ $TMPCOUNT -eq $CURRENTCOUNT ]
		then
			echo "Nothing to report."
			echo ""
	else
		if [ $TMPCOUNT -lt $CURRENTCOUNT ]
			then
				echo "Old Count is Less than the Current Count"
				echo "Reporting new entries"
				DIFFERENCE=`expr $CURRENTCOUNT - $TMPCOUNT` # Get the difference between counts.
				NEWENTRIES="`tail -$DIFFERENCE $LOGFILE`" # Grab the new lines from the log.
				echo "Date: $TODAY" >> $REPORTLOG
				echo "Hostname: $HOSTNAME" >> $REPORTLOG
				echo $BREAKER >> $REPORTLOG
				echo "$LOGFILE Report" >> $REPORTLOG
				echo "$NEWENTRIES" | sed G >> $REPORTLOG
				echo $BREAKER >> $REPORTLOG
				echo $CURRENTCOUNT > $TMPFILE #rewrite the tempfile to reflect the changes.
				echo ""
		fi
	fi
}

checkdisk(){
	df -k >> $REPORTLOG
}

############################################################
# Run the function on these different log files. Include 3 parameters.
# ex. chklog /path/to/log /path/to/tmpfile $REPORTLOG
# This is the section you want to modify if your adding/removing
# logs to monitor.
############################################################

checklog /var/log/syslog /tmp/syslog.tmp
checklog /var/adm/messages /tmp/messages.tmp
checklog /opt/SUNWwbsvr/https-bigadmin/logs/access /tmp/webaccess.tmp
checkdisk

#############################################################
# Mail the reported results
#############################################################

### Adjust to send/mail to who is needed (root by default)
cat $REPORTLOG | mailx -r "$FROM" -s "$SUBJECT" root
echo "Report sent to root"

#############################################################
# Clean up report file.
#############################################################
rm $REPORTLOG