Fix error message: print the exit status, not the string "$?".

diff --git a/apps/workbench/app/controllers/collections_controller.rb b/apps/workbench/app/controllers/collections_controller.rb
index a5fed9d9a368cbc7194d4db2b50e7cd2de19de62..3cea60b9d95bbbde9d446e574575971f6baf1320 100644 (file)
--- a/apps/workbench/app/controllers/collections_controller.rb
+++ b/apps/workbench/app/controllers/collections_controller.rb
@@ -121,7 +121,7 @@ class CollectionsController < ApplicationController
           yield buf
         end
       end
-      Rails.logger.warn("#{@opts[:uuid]}/#{@opts[:file]}: $?") if $? != 0
+      Rails.logger.warn("#{@opts[:uuid]}/#{@opts[:file]}: #{$?}") if $? != 0
     end
   end
 end