---------------
#!/bin/sh

# Input parameters: Hostname, testname (column), and messagefile
HOSTNAME="$1"
TESTNAME="$2"
FNAME="$3"

if [ "$TESTNAME" = "license" ]
then
        # Analyze the message we got
        InUse=`grep "In Use" $FNAME | cut -d : -f 2 | sed "s/ //"`
        
        # The RRD dataset definitions
        echo "DS:license:GAUGE:600:0:U"
   
        # The filename
        echo "license.rrd"

        # The data
        echo "$InUse"

        # Added for debugging purposes
        if [ "$HOSTNAME" = "license" ]
        then
                echo $HOSTNAME, $TESTNAME, $FNAME >>license_test.txt
                echo "$InUse" >>license_test.txt
                cat $FNAME >>license_test.txt
        fi
fi


The output from the debugging part (license_test.txt) looks like this:
--------------
license, license, /usr/local/hobbit/server/tmp/rrd_msg_27159
8 
status license.license green Tue 05/10/2005- 7:37:41.18 
Pro/Engineer Wildfire 2 Licenses 
-------------------------------- 
Total licenses available: 31 
                  In Use: 8 


And here's the RRD definition:
--------------
[license]
        TITLE License Utilization
        YAXIS Used Licenses
        DEF:avg=license.rrd:license:AVERAGE
        LINE2:avg#@COLOR@:Used Licenses
        GPRINT:avg:LAST: \: %5.0lf (cur)
        GPRINT:avg:MAX: \: %5.0lf (max)
        GPRINT:avg:MIN: \: %5.0lf (min)
        GPRINT:avg:AVERAGE: \: %5.0lf (avg)\n