> There are a couple of easy ways to do this. To do it using your script,
> this would do it (assuming your script is called "mp32wav"):
> 
> cd /path/to/mp3s/
> for i in `ls -1 *.mp3`; do mp32wav $i $i.wav; done

Ummm ... not quite. Forget the backtick command evaluation, and the "ls -l".
Assuming the syntax is right for mp32wav, it would be simply

for i in *.mp3; do mp32wav $i $i.wav; done

On the other hand, on each iteration $i becomes set to something.mp3,
meaning that the second argument to mp32wav becomes something.mp3.wav, which
I don't think is really what you want either. So you might try something
more like this as the guts of your script:

for i in *.mp3
do
j=`basename $i .mp3`
mp32wav $i $j.wav
done

-- 
Lynn David Newton
Phoenix, AZ