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Sometimes, when you run some slow processing of a point cloud and output the result in a file, you may want to monitor the progress. Then, the following trick may help you:

> some_slow_processing_script > points.csv &
> ( i=0; while true; do cat points.csv | csv-paste value=$i -; (( ++i )); done; sleep 30 ) | view-points --fields block,,,,x,y,z
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