Use dump or write? or what?

I am calculating two t-test values for each of many files then save it
to file calculate another set and append, repeat.

You did not tell use what you want to do with the data in the file. If you
just want a copy of the output, bracketing with sink(file) and sink() can be
useful. 

If you want to process the results later, try save/load. 

Dieter


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