demo-gdal-merge-single.sh

# Generate structure
rm -rf demo
mkdir demo
mkdir demo/germany
mkdir demo/france
cd demo/germany

# Get data
ogr2ogr germany.shp /vsicurl/https://github.com/datasets/geo-countries/raw/master/data/countries.geojson -dialect SQLite -sql "SELECT * FROM countries WHERE ADMIN = 'Germany'"
cd ../france
ogr2ogr france.shp /vsicurl/https://github.com/datasets/geo-countries/raw/master/data/countries.geojson -dialect SQLite -sql "SELECT * FROM countries WHERE ADMIN = 'France'"
cd ../..

# See directory structure
tree demo

# Merge and add a custom column filled with infos from origin layers
ogrmerge.py -single -overwrite_ds -o merged.shp demo/*/*shp -src_layer_field_name custom1 -src_layer_field_content '{DS_NAME} AND {AUTO_NAME}'

# See how the custom field content has been filled
ogrinfo -geom=NO merged.shp merged

# In src_layer_field_content from ogrmerge.py line,
# use below template keyword to see change in
# '{AUTO_NAME}'
# '{DS_BASENAME}'
# '{DS_BASENAME}'
# '{DS_NAME}'
# '{DS_INDEX}'
# '{LAYER_NAME}'
# '{LAYER_INDEX}'