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for i in `find . *.txt`; do perl -pi -e 's/\n/,/' $i; done;

#!/usr/bin/perl

...
    return;
}
<p><b>update 2</b> After reading the other replies I realized I misrea
+d the question, and there was no need for recursion, so the solution 
+came to be more complex than it needed to be. I was really in the nee
+d to get some sleep.</p>