q is a command line tool that allows direct execution of SQL-like queries on CSVs/TSVs (and any other tabular text files).
q treats ordinary files as database tables, and supports all SQL constructs, such as WHERE, GROUP BY, JOINs etc. It supports automatic column name and column type detection, and provides full support for multiple encodings.
q's web site is http://harelba.github.io/q/. It contains everything you need to download and use q in no time.
Download links for all OSs are here.
Go here for more examples.
Any feedback/suggestions/complaints regarding this tool would be much appreciated. Contributions are most welcome as well, of course.
Harel Ben-Attia, harelba@gmail.com, @harelba on Twitter
q on twitter: #qtextasdata