rngdbdump

I am trying to dump data, in a .csv file for a single customer out of ARCUSTOMER and ARCOMMENTS. What is the correct syntax if the dataid is prod9 and the key fields are company=1 and customer=4059?

So far I can get it on screen but I need it in a .csv file. I have rngdbdump -c arcustomer -v company=1 customer=4059. Where do I put the name of the file I want to dump to?

Thanks in advance for any help.