[GTALUG] Wireshark question -- script to extract data in TCP stream?

To network experts...

From Wireshark, I can click "TCP Follow" tab and extract one-way data flow from a tcp stream. I can do this manually, one by one. But, I have many many streams.

Does anyone know how to extract one-way data stream via script? Google says tshark -q -r capture.pcapng -z follow,tcp,raw,0 where '0' is the tcp stream number 0. But, it gives me data moving both ways. I just want data moving one-way. -- William Park <opengeometry@yahoo.ca> .