And yet another set of tools is vnlog (https://github.com/dkogan/vnlog https://github.com/dkogan/vnlog). It assumes you have whitespace-separated data, with a l

And yet another set of tools is vnlog (https://github.com/dkogan/vnlog https://github.com/dkogan/vnlog). It assumes you have whitespace-separated data, with a legend comment, then you can do the above thing with < data.vnl vnl-filter -p thiscolumn,thatcolumn 'thiscolumn != "foo"' If you don't strictly need csv, those tools are quite nice, and have a really friendly learning curve. Disclaimer: I'm the author