GDAL: Bash Script for Converting All GPKG-Files From Directory To GPX-Format

Since lately QGIS (QGIS 3.12) comes equipped with a nice tool ("Split Vector Layers"), that will split your layers based on an attribute and ame your files accordingly. Th only drawback is, that you can not choose different output format - so you'll need to go with the only possibility, namely the GPKG-format. Now, I rather needed GPX files and had to find a way of converting the gpkg-files in batch mode. This I achieved by writing a small bash script looping over the files with GDAL's ogr2ogr command, and convert each file to GPX.

#!/bin/bash
## first two lines and last line prevent whitspace problems in filenames (see: https://unix.stackexchange.com/questions/9496/looping-through-files-with-spaces-in-the-names
## then loop over all files with gpkg extension an convert to gpx format preserving the old filename!
## the script would throw an error and discard attribute fields for all fieldnames that do not match the GPX XML definition (name, cmt, etc…).
## if you dont put the GPX_USE_EXTENSION=YES paramter..
## with <-t_srs epsg:4326=""> the target CRS, to which the input coordinates will be transformed, is given..

OIFS="$IFS"
IFS=$'\n'
for f in *.gpkg
	do ogr2ogr -f GPX -dsco GPX_USE_EXTENSIONS=YES -t_srs EPSG:4326 -overwrite ${f%.*}.gpx $f
done
IFS="$OIFS"
read -p "Hit [Enter] to exit..."