gdal_contour(1) on Linux
The text 6fb561add468, as Debian 10 (Buster) shipped it.
Builds vector contour lines from a raster elevation model.
Flags it lists
-
-a -
-amax -
-amin -
-b -
-dsco -
-e -
-f -
-fl -
-i -
-lco -
-nln -
-off -
-snodata