US stock data file conversion

[Marco Guglielmo <mgugliel@xxxxxxxxxxxxxxxx>]

Hi to the list,

I am triyng to build up an historical data base of the most important US
stocks.
I am using the daily file quotations downloaded free from the
www.gofutures.com site.
Considering that the ASCI file has more than 16,000 strings of data,
does anybody advise me how to extract in a quick way only some hundreds
stock quotations?
Does anybody has already withstanded this problem?
Any help would be greatly appreciated

Best Regards

Marco Guglielmo
(Turin,Italy)