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Date: Wed, 13 Jan 2010 02:05:58 +0200 (IST)
From: Geoff Shang <geoff@QuiteLikely.com>
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Subject: Re: analyze a .wav or .mp3 file
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On Mon, 11 Jan 2010, Tim Chase wrote:

> I was about to fire off a similar email, but Chris beat me to the punch.  If 
> you just want the volume adjustment, you can add "-v" at the end of the 
> command:
>
>  sox my_file.wav -n stat -v
>
> and all it reports is the volume number with no extra information.  Can be 
> useful for scripting purposes too.

My suggestion also.

One thing to keep in mind - at least the versions I've used send this 
number to stderr instead of stdout.  No idea why, but if you want to use 
it in a script, you need to keep this in mind, assuming it hasn't changed.

Geoff.