Add logging for arbitrary commands

dotfiles/bmo/menu.ini

@@ -53,7 +53,7 @@
 [menu.run_hist]
 
     generator   = tac .bmo-dmenu.log | awk '!seen[$0]++'
-    consumer    = tee -a .bmo-dmenu.log | bash -
+    consumer    = tee -a .bmo-dmenu.log | bash - >> .bmo-menu-run_hist.log 2>&1
 
 [menu.browsers]