[Geotiff] mask by raster

[Arnold Perez]

I have 2 rasters in GeoTiff format. One has all of the land and water and
the other is a mask file that shows either 0 for water or 1 for land. I
basically want my output to just have the land values and all the areas
that were water in the first image to just be 0,0,0. Is there a way to do
this with any of the gdal command line tools?

Basically I want to do what gdal_rasterize does with a shp file mask but
with a raster instead.
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