gdal_viewshed(1) on Linux
The text 72385fbb4f67, as Debian 11 (Bullseye) shipped it.
Calculates a viewshed raster from an input raster DEM for a user defined point
Flags it lists
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-a_nodata -
-b -
-cc -
-co -
-iv -
-md -
-ov -
-ox -
-oy -
-oz -
-tz -
-vv