BASH for Creating Geotiff from Bathy PNG

gistfile1.txt

#!/bin/bash

input_extent=
input_png=
output_loc=

function gdal_extent_gdalwarp_te() {
    if [ -z "$1" ]; then
        echo "Missing arguments. Syntax:"
        echo "  gdal_extent <input_raster>"
        return
    fi
    EXTENT=$(gdalinfo "$1" |\
        grep "Lower Left\|Upper Right" |\
        sed "s/Lower Left  //g;s/Upper Right //g;s/).*//g" |\
        #tr "\n" " " |\
        sed 's/ *$//g' |\
        tr -d "\n[(]'" |\
        sed 's/,/ /g')
    echo -n "$EXTENT"
}

echo $input_png

file_name=$( basename $input_png | sed 's/.png//' )

echo $file_name

ExtractedExtent=$(gdal_extent_gdalwarp_te "${input_extent}")
echo $ExtractedExtent
set -- $ExtractedExtent
flipextract=$( echo $1 $4 $3 $2 )
#flipextract=$( echo $1 $2 $3 $4 )
echo $flipextract

gdal_translate -of GTiff -a_srs epsg:3994 -a_ullr $flipextract $input_png $output_loc/$file_name.tif