Replacing all attachment links in post with media file link

I found a nice snippet at this site for your functions.php that does the trick:

 add_shortcode( 'gallery', 'file_gallery_shortcode' ); 

 function file_gallery_shortcode( $atts ) {
      $atts['link'] = 'file';
      return gallery_shortcode( $atts );
 }

I’d actually been looking unsuccessfully for the same thing, so I’m glad you asked.