Someone

#!/bin/bash

## full path to mcmap binary
cd /minecraft/mcmap/
## path to your world
WORLD=/minecraft/world/
## path to write output image to
OUTPUT="/var/www/maps"
## see below to change the area to render (lines that start with ##)
################################

FILE=history-`date +%s`.png

OLD5=none
OLD6=none
if [ -e "$OUTPUT/output.day.png" ]; then
        OLD5=`md5sum $OUTPUT/output.day.png | cut -b 1-32`
fi
if [ -e "$OUTPUT/output.night.png" ]; then
        OLD6=`md5sum $OUTPUT/output.night.png | cut -b 1-32`
fi


NIGHT="-skylight"
NIGHTSTATUS="0"


## change the values here to define the area to render
#./mcmap -png $NIGHT -from -40 -60 -to 20 20 "$WORLD" > /dev/null
## if you want the whole world, use:
./mcmap -png "$WORLD" $NIGHT > /dev/null
RET=$?
if [ "$RET" -ne "0" ]; then
        echo "Error creating image for $FILE"
        exit 1;
fi

NEW5=`md5sum output.png | cut -b 1-32`
if [ "$OLD5" != "$NEW5" ] && [ "$OLD6" != "$NEW5" ]; then
        mkdir -p $OUTPUT/history/
        pngcrush output.png $OUTPUT/history/$FILE > /dev/null

fi