How to extract ONLY the info I want from captured data?

Sean WANG <[email protected]> Mon, 13 Nov 2006 15:03:30 +0800

Newsgroups	gmane.network.ethereal.user
Message-ID	<[email protected]>

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Hi,

I have a captured data file. How do I extract ONLY the info I am 
interested for each packet? I want the output file contain only (Source 
IP, Destination IP, Source Port, Destination Port, Protocol, Received 
Time).

Is there any command of Ethereal that I can use? Or do you have any 
other suggestions?
Thx a lot.

Regards,
Sean