Open file in folder and subfolders

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@plux

loadStrings() and BufferedWriter or using the Table class?

Well, loadTable() automatically parses CSV & TSV files for us:

loadTable() / Reference

And by using the Table class we have access to useful methods such as getRowCount():

getRowCount() / Reference

So you can find out the Table w/ the least number of rows.

Then afterwards, invoke setRowCount() on all 400+ Table containers, so they’ll all have the same number of rows:
Processing.GitHub.io/processing-javadocs/core/processing/data/Table.html#setRowCount-int-

And finally, use saveTable() on each trimmed down Table:

saveTable() / Reference