[LAU] removing DC, for instance with sox

Hi

I'd like to remove dc offset from a bunch of .wav files. It seems the
sox effect dcshift does this, but I cannot figure out how to use it. The
following has no effect:

sox test.wav test2.wav dcshift 0

Anyone go a clue how to use this? Alternatively, is there another
commandline tool that does this?

-- 
Atte
http://atte.dk    http://modlys.dk
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