The command takes a query argument, so you can just:

beet replaygain rg_album_gain::^$


> On Aug 24, 2016, at 7:07 AM, Karcsi Kolbasz <[email protected]> wrote:
> 
> Recently finished getting through all of my files, getting them all tagged 
> the way I want.  However, I have come to realize that some albums are missing 
> replay gain.  Instead of running a blanket replaygain -a, I was hoping htere 
> was a way to querry only those files that are missing the data.
> 
> I can do 'beet info rg_album_gain::^$' and it shows me the files without the 
> information.  Now I am hoping there was a way to pass these files to the 
> command replaygain -a
> 
> is it as simple as piping to replaygain -a?
> 
> beet info rg_album_gain::^$ | replaygain -a
> 
> I figure it is easier to ask before I break something.  thanks.
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