Tshark output file problem, saving to csv or txt

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How to save tshark output to files? I need to capture traffic after every 5 second and save it to csv or txt file. I try this code

tshark -i 2 -T fields -e frame.number-e frame.time_delta -e frame.len -b duration:5 -E header=y -E quote=d -E occurrence=f -w file.txt > test.txt

I need to create a lot of files but using -w looks bad.