Bash Shell Script for merging geographic files

bash.sh

#! /bin/sh

# Path to input files to merge.
FILES=${1-`pwd`}/files-to-merge

# Build directory name.
BUILD_DIR=build

# The outputted shapefile name.
OUTPUT_FILENAME=merged

# Projection type. "ogr2ogr"
PROJECTION=EPSG:900913

###################################################

INDEX=0
for f in $(find $FILES -iname "*.kmz" -or -iname "*.kml" -or -iname "*.shp")
do
    echo "    ==> $f" 
    if ((INDEX == 0)); then
        ogr2ogr -overwrite -t_srs $PROJECTION ./$BUILD_DIR/$OUTPUT_FILENAME.shp $f
    else
        ogr2ogr -update -append -t_srs $PROJECTION ./$BUILD_DIR/$OUTPUT_FILENAME.shp $f
    fi
    let INDEX++
done