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diff --git a/Logs/Unused.hs b/Logs/Unused.hs
new file mode 100644
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+++ b/Logs/Unused.hs
@@ -0,0 +1,91 @@
+{- git-annex unused log file
+ -
+ - Copyright 2010,2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Logs.Unused (
+	UnusedMap,
+	UnusedMaps(..),
+	writeUnusedLog,
+	readUnusedLog,
+	withUnusedMaps,
+	startUnused,
+) where
+
+import qualified Data.Map as M
+
+import Common.Annex
+import Command
+import Types.Key
+import Utility.TempFile
+
+writeUnusedLog :: FilePath -> [(Int, Key)] -> Annex ()
+writeUnusedLog prefix l = do
+	logfile <- fromRepo $ gitAnnexUnusedLog prefix
+	liftIO $ viaTmp writeFile logfile $
+		unlines $ map (\(n, k) -> show n ++ " " ++ show k) l
+
+readUnusedLog :: FilePath -> Annex UnusedMap
+readUnusedLog prefix = do
+	f <- fromRepo $ gitAnnexUnusedLog prefix
+	ifM (liftIO $ doesFileExist f)
+		( M.fromList . catMaybes . map parse . lines
+			<$> liftIO (readFile f)
+		, return M.empty
+		)
+	where
+		parse line =
+			case (readish tag, readKey rest) of
+				(Just num, Just key) -> Just (num, key)
+				_ -> Nothing
+			where
+				(tag, rest) = separate (== ' ') line
+
+type UnusedMap = M.Map Int Key
+
+data UnusedMaps = UnusedMaps
+	{ unusedMap :: UnusedMap
+	, unusedBadMap :: UnusedMap
+	, unusedTmpMap :: UnusedMap
+	}
+
+{- Read unused logs once, and pass the maps to each start action. -}
+withUnusedMaps :: (UnusedMaps -> Int -> CommandStart) -> CommandSeek
+withUnusedMaps a params = do
+	unused <- readUnusedLog ""
+	unusedbad <- readUnusedLog "bad"
+	unusedtmp <- readUnusedLog "tmp"
+	return $ map (a $ UnusedMaps unused unusedbad unusedtmp) $
+		concatMap unusedSpec params
+
+unusedSpec :: String -> [Int]
+unusedSpec spec
+	| "-" `isInfixOf` spec = range $ separate (== '-') spec
+	| otherwise = catMaybes [readish spec]
+	where
+		range (a, b) = case (readish a, readish b) of
+			(Just x, Just y) -> [x..y]
+			_ -> []
+
+{- Start action for unused content. Finds the number in the maps, and
+ - calls either of 3 actions, depending on the type of unused file. -}
+startUnused :: String
+	-> (Key -> CommandPerform)
+	-> (Key -> CommandPerform) 
+	-> (Key -> CommandPerform)
+	-> UnusedMaps -> Int -> CommandStart
+startUnused message unused badunused tmpunused maps n = search
+	[ (unusedMap maps, unused)
+	, (unusedBadMap maps, badunused)
+	, (unusedTmpMap maps, tmpunused)
+	]
+	where
+		search [] = stop
+		search ((m, a):rest) =
+			case M.lookup n m of
+				Nothing -> search rest
+				Just key -> do
+					showStart message (show n)
+					next $ a key