Ingredients a decent DEM gdal some computer compute grayscale hillshade using gdaldem gdaldem hillshade -compute_edges your_dem_file hillshade.tif color-ramp to compute transparency (alpha channel) In another bowl, prepare the following shade.ramp file:
Add a suffix for file in *; do mv "$file" "$(basename "$file")yourSuffix"; done; Exmpale to add an underscore "_" at the end each text file: for file in *.txt; do mv "$file" "$(basename "$file")_"; done; Add a prefix