Dear Assaf,
I'm writing you because I just discovered the existence of Datamash and I thought you might be interested in looking into this:
This is a "command line suite" for data manipulation that is currently developed by some researchers at my institute.
It is covered under GPL v.2.
I hope this helps.
Best,
Matteo
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Follow me on Twitter: @mattk7
PhD Student of Economics and Researcher
Laboratory of Economics and Management
Sant'Anna School of Advanced Studies
Piazza Martiri della Libertà, 33
I-56127 PISA (Italy)
Web: http://www.matteochinazzi.com