I've found Unix Text Processing (http://oreilly.com/openbook/utp/ http://oreilly.com/openbook/utp/) to be very very helpful when trying to some data processing

I've found Unix Text Processing (http://oreilly.com/openbook/utp/ http://oreilly.com/openbook/utp/) to be very very helpful when trying to some data processing I would normally do in excel.