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Input data format and read multiple files into Grass 6.4.1

I am trying to read in multiple (hundreds, thousand) LiDAR ascii files into Grass. They contain elevation data. I think I have managed one, and I can make a map of elevations, using File, Import ...
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What I'm doing wrong with the command r.out.ascii in GRASS GIS?

I have raster in .bil format which I want to save in GRASS GIS with r.out.ascii. I get this result in .txt file: north: 1N south: 0 east: 1E west: 0 rows: 1 cols: 1 55537 I suppose it is something ...