export GRASS_RENDER_FILE=map.bmp export GRASS_RENDER_WIDTH=640 export GRASS_RENDER_HEIGHT=480 export GRASS_RENDER_IMMEDIATE=PNG export GRASS_RENDER_FILE_MAPPED=TRUE export GRASS_RENDER_FILE_READ=TRUE d.erase ximgview $GRASS_RENDER_FILE percent=50 & d.rast elevation.dem d.vect roads
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