My first csv file looks like this with header included(header is included only at the top not after every entry):
NAME,SURNAME,AGE Fred,Krueger,Unknown ....
Try this:
http://ondra.zizka.cz/stranky/programovani/ruzne/querying-transforming-csv-using-sql.texy
crunch input.csv output.csv "SELECT AVG(duration) AS durAvg FROM (SELECT * FROM indata ORDER BY duration LIMIT 2 OFFSET 6)"