Carlos J. Hernandez wrote:
>   csv2mp < source.txt | ....
> 
> the filehandle is in ARGF.

Or just this:

csv2mp source.txt | ....

For example:

$ cat test.txt
This is
a test
$ ruby -e 'puts ARGF.read' test.txt
This is
a test

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       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407