diff --git a/examples/Pipe/Log.hs b/examples/Pipe/Log.hs
index 64f64b8..78bff29 100644
--- a/examples/Pipe/Log.hs
+++ b/examples/Pipe/Log.hs
@@ -12,13 +12,11 @@ import Data.Text.Lazy as LT
 default (LT.Text)
 
 main = shs $ do
-    makeLog 
+    makeLog
     appendfile logFile . cons '\n' =<< liftSh sort (lsT ".")
 
 logFile = "log"
 
-makeLog = 
-    unlessM (test_f logFile) 
+makeLog =
+    unlessM (test_f logFile)
         (touchfile logFile)
-        
-
diff --git a/examples/Pipe/Pictures.hs b/examples/Pipe/Pictures.hs
index 781f66a..8372563 100644
--- a/examples/Pipe/Pictures.hs
+++ b/examples/Pipe/Pictures.hs
@@ -1,4 +1,4 @@
--- | Suppose we have a directory named "pictures". 
+-- | Suppose we have a directory named "pictures".
 -- We want to copy all files with specified extensions.
 -- So that jpgs go in one directory and pngs in the other.
 {-# LANGUAGE OverloadedStrings #-}
@@ -23,11 +23,9 @@ pictures :: FilePath
 pictures = "pictures"
 
 proc :: Text -> Sh ()
-proc ext = do    
+proc ext = do
     mkdir_p ext'
     findExt ext pictures >>= flip cp ext'
     where ext' = fromText ext
 
 findExt a = findWhen (pure . hasExt a)
-
-
diff --git a/shelly-extra/Shelly/Background.hs b/shelly-extra/Shelly/Background.hs
index 16fb2a3..65aec58 100644
--- a/shelly-extra/Shelly/Background.hs
+++ b/shelly-extra/Shelly/Background.hs
@@ -1,6 +1,6 @@
 {-# LANGUAGE OverloadedStrings, ScopedTypeVariables, ExistentialQuantification #-}
 -- | A futures implementation that integrates with shelly
--- 
+--
 -- > jobs 5 (\job -> background job (sleep 2) >> background job (sleep 1))
 --
 -- 'jobs' will wait for all concurrent jobs to finish.
diff --git a/shelly-extra/test/main.hs b/shelly-extra/test/main.hs
index 41f218d..995ff37 100644
--- a/shelly-extra/test/main.hs
+++ b/shelly-extra/test/main.hs
@@ -50,6 +50,6 @@ main = do
       echo "immediate2"
       _<- background job $ cmd "sleep" "2"
       echo "blocked by background "
- 
+
     echo "blocked by jobs"
 
diff --git a/src/Shelly.hs b/src/Shelly.hs
index 38d9ab9..e2e1990 100644
--- a/src/Shelly.hs
+++ b/src/Shelly.hs
@@ -516,7 +516,7 @@ mv from' to' = do
   to_dir <- test_d to
   let to_loc = if not to_dir then to else to FP.</> (FP.takeFileName from)
   liftIO $ createDirectoryIfMissing True (takeDirectory to_loc)
-  if not from_dir 
+  if not from_dir
     then liftIO $ renameFile from to_loc
       `catchany` (\e -> throwIO $
         ReThrownException e (extraMsg to_loc from)
@@ -1415,11 +1415,11 @@ cp_r from' to' = do
        when (from == to) $ liftIO $ throwIO $ userError $ show $ "cp_r: " <>
          toTextIgnore from <> " and " <> toTextIgnore to <> " are identical"
 
-       finalTo <- if not toIsDir then do 
-            mkdir to 
-            return to 
+       finalTo <- if not toIsDir then do
+            mkdir to
+            return to
           else do
-            -- this takes the name of the from directory 
+            -- this takes the name of the from directory
             -- because filepath has no builtin function like `dirname`
             let d = to </> (last . splitPath $ takeDirectory (addTrailingPathSeparator from))
             mkdir_p d >> return d
diff --git a/src/Shelly/Base.hs b/src/Shelly/Base.hs
index c7c52ae..2e31759 100644
--- a/src/Shelly/Base.hs
+++ b/src/Shelly/Base.hs
@@ -177,8 +177,8 @@ eitherRelativeTo relativeFP fp = do
       -> Sh (Either FilePath FilePath)
     stripIt rel toStrip nada =
       let stripped = FP.makeRelative rel toStrip
-      in if stripped == toStrip 
-        then nada 
+      in if stripped == toStrip
+        then nada
         else return $ Right stripped
 
 -- | make the second path relative to the first
@@ -231,7 +231,7 @@ instance Exception EmptyFilePathError
 -- To create a relative path, use 'relPath'.
 absPath :: FilePath -> Sh FilePath
 absPath p | null p = liftIO $ throwIO EmptyFilePathError
-          | isRelative p = do 
+          | isRelative p = do
             cwd <-  gets sDirectory
             return (cwd FP.</> p)
           | otherwise = return p
@@ -321,4 +321,3 @@ traceEcho msg = trace ("echo " `mappend` "'" `mappend` msg `mappend` "'")
 -- @... `catch` \(e :: SomeException) -> ...@).
 catchany :: IO a -> (SomeException -> IO a) -> IO a
 catchany = catch
-
diff --git a/src/Shelly/Pipe.hs b/src/Shelly/Pipe.hs
index ea9fe92..b60bad9 100644
--- a/src/Shelly/Pipe.hs
+++ b/src/Shelly/Pipe.hs
@@ -1,14 +1,14 @@
-{-# LANGUAGE FlexibleInstances, TypeSynonymInstances, 
+{-# LANGUAGE FlexibleInstances, TypeSynonymInstances,
              TypeFamilies, ExistentialQuantification #-}
--- | This module is a wrapper for the module "Shelly". 
--- The only difference is a main type 'Sh'. In this module 
+-- | This module is a wrapper for the module "Shelly".
+-- The only difference is a main type 'Sh'. In this module
 -- 'Sh' contains a list of results. Actual definition of the type 'Sh' is:
 --
 -- > import qualified Shelly as S
 -- >
 -- > newtype Sh a = Sh { unSh :: S.Sh [a] }
 --
--- This definition can simplify some filesystem commands. 
+-- This definition can simplify some filesystem commands.
 -- A monad bind operator becomes a pipe operator and we can write
 --
 -- > findExt ext = findWhen (pure . hasExt ext)
@@ -17,12 +17,12 @@
 -- > main = shs $ do
 -- >     mkdir "new"
 -- >     findExt "hs"  "." >>= flip cp "new"
--- >     findExt "cpp" "." >>= rm_f 
+-- >     findExt "cpp" "." >>= rm_f
 -- >     liftIO $ putStrLn "done"
 --
 -- Monad methods "return" and ">>=" behave like methods for
--- @ListT Shelly.Sh@, but ">>" forgets the number of 
--- the empty effects. So the last line prints @\"done\"@ only once. 
+-- @ListT Shelly.Sh@, but ">>" forgets the number of
+-- the empty effects. So the last line prints @\"done\"@ only once.
 --
 -- Documentation in this module mostly just reference documentation from
 -- the main "Shelly" module.
@@ -73,7 +73,7 @@ module Shelly.Pipe
          , exit, errorExit, quietExit, terror
 
          -- * Exceptions
-         , catchany, catch_sh, finally_sh 
+         , catchany, catch_sh, finally_sh
          , ShellyHandler(..), catches_sh
          , catchany_sh
 
@@ -89,7 +89,7 @@ module Shelly.Pipe
          -- * internal functions for writing extensions
          , get, put
 
-         -- * find functions 
+         -- * find functions
          , find, findWhen, findFold
          , findDirFilter, findDirFilterWhen, findFoldDirFilter
          , followSymlink
@@ -122,14 +122,14 @@ import Data.Text as T hiding (concat, all, find, cons)
 
 
 -- | This type is a simple wrapper for a type @Shelly.Sh@.
--- 'Sh' contains a list of results. 
+-- 'Sh' contains a list of results.
 newtype Sh a = Sh { unSh :: S.Sh [a] }
 
 instance Functor Sh where
-    fmap f = Sh . fmap (fmap f) . unSh    
+    fmap f = Sh . fmap (fmap f) . unSh
 
 instance Monad Sh where
-    return  = Sh . return . return 
+    return  = Sh . return . return
     a >>= f = Sh $ fmap concat $ mapM (unSh . f) =<< unSh a
     a >> b  = Sh $ unSh a >> unSh b
 
@@ -154,29 +154,29 @@ instance MonadIO Sh where
 sh0 :: S.Sh a -> Sh a
 sh0 = Sh . fmap return
 
-sh1 :: (a -> S.Sh b) -> (a -> Sh b) 
+sh1 :: (a -> S.Sh b) -> (a -> Sh b)
 sh1 f = \a -> sh0 (f a)
 
-sh2 :: (a1 -> a2 -> S.Sh b) -> (a1 -> a2 -> Sh b) 
+sh2 :: (a1 -> a2 -> S.Sh b) -> (a1 -> a2 -> Sh b)
 sh2 f = \a b -> sh0 (f a b)
 
-sh3 :: (a1 -> a2 -> a3 -> S.Sh b) -> (a1 -> a2 -> a3 -> Sh b) 
+sh3 :: (a1 -> a2 -> a3 -> S.Sh b) -> (a1 -> a2 -> a3 -> Sh b)
 sh3 f = \a b c -> sh0 (f a b c)
 
-sh4 :: (a1 -> a2 -> a3 -> a4 -> S.Sh b) -> (a1 -> a2 -> a3 -> a4 -> Sh b) 
+sh4 :: (a1 -> a2 -> a3 -> a4 -> S.Sh b) -> (a1 -> a2 -> a3 -> a4 -> Sh b)
 sh4 f = \a b c d -> sh0 (f a b c d)
 
 sh0s :: S.Sh [a] -> Sh a
 sh0s = Sh
 
-sh1s :: (a -> S.Sh [b]) -> (a -> Sh b) 
+sh1s :: (a -> S.Sh [b]) -> (a -> Sh b)
 sh1s f = \a -> sh0s (f a)
 
 {-  Just in case ...
-sh2s :: (a1 -> a2 -> S.Sh [b]) -> (a1 -> a2 -> Sh b) 
+sh2s :: (a1 -> a2 -> S.Sh [b]) -> (a1 -> a2 -> Sh b)
 sh2s f = \a b -> sh0s (f a b)
 
-sh3s :: (a1 -> a2 -> a3 -> S.Sh [b]) -> (a1 -> a2 -> a3 -> Sh b) 
+sh3s :: (a1 -> a2 -> a3 -> S.Sh [b]) -> (a1 -> a2 -> a3 -> Sh b)
 sh3s f = \a b c -> sh0s (f a b c)
 -}
 
@@ -188,19 +188,19 @@ lift2 f a b = Sh $ join $ liftA2 (mapM2 f') (unSh a) (unSh b)
     where f' = \x y -> f (return x) (return y)
 
 mapM2 :: Monad m => (a -> b -> m c)-> [a] -> [b] -> m [c]
-mapM2 f as bs = sequence $ liftA2 f as bs 
+mapM2 f as bs = sequence $ liftA2 f as bs
 
 -----------------------------------------------------------
 
 -- | Unpack list of results.
 unroll :: Sh a -> Sh [a]
-unroll = Sh . fmap return . unSh 
+unroll = Sh . fmap return . unSh
 
 -- | Pack list of results. It performs @concat@ inside 'Sh'.
 roll :: Sh [a] -> Sh a
 roll = Sh . fmap concat . unSh
 
--- | Transform result as list. It can be useful for filtering. 
+-- | Transform result as list. It can be useful for filtering.
 liftSh :: ([a] -> [b]) -> Sh a -> Sh b
 liftSh f = Sh . fmap f . unSh
 
@@ -211,7 +211,7 @@ liftSh f = Sh . fmap f . unSh
 shelly :: MonadIO m => Sh a -> m [a]
 shelly = S.shelly . unSh
 
--- | Performs 'shelly' and then an empty action @return ()@. 
+-- | Performs 'shelly' and then an empty action @return ()@.
 shs :: MonadIO m => Sh () -> m ()
 shs x = shelly x >> return ()
 
@@ -289,7 +289,7 @@ lastStderr = sh0 S.lastStderr
 
 -- | see 'S.setStdin'
 setStdin :: Text -> Sh ()
-setStdin = sh1 S.setStdin 
+setStdin = sh1 S.setStdin
 
 -- | see 'S.lastExitCode'
 lastExitCode :: Sh Int
@@ -358,7 +358,7 @@ pwd :: Sh FilePath
 pwd = sh0 S.pwd
 
 -----------------------------------------------------------------
--- Printing 
+-- Printing
 
 -- | Echo text to standard (error, when using _err variants) output. The _n
 -- variants do not print a final newline.
@@ -528,15 +528,15 @@ findFold cons nil a = Sh $ S.findFold cons' nil' a
 -- | see 'S.findDirFilter'
 findDirFilter :: (FilePath -> Sh Bool) -> FilePath -> Sh FilePath
 findDirFilter p a = Sh $ S.findDirFilter (fmap and . unSh . p) a
-    
+
 -- | see 'S.findDirFilterWhen'
 findDirFilterWhen :: (FilePath -> Sh Bool) -- ^ directory filter
                   -> (FilePath -> Sh Bool) -- ^ file filter
                   -> FilePath -- ^ directory
                   -> Sh FilePath
-findDirFilterWhen dirPred filePred a = 
-    Sh $ S.findDirFilterWhen  
-            (fmap and . unSh . dirPred) 
+findDirFilterWhen dirPred filePred a =
+    Sh $ S.findDirFilterWhen
+            (fmap and . unSh . dirPred)
             (fmap and . unSh . filePred)
             a
 
@@ -547,9 +547,9 @@ findFoldDirFilter cons nil p a = Sh $ S.findFoldDirFilter cons' nil' p' a
     where p'    = fmap and . unSh . p
           nil'  = return nil
           cons' as dir = unSh $ roll $ mapM (flip cons dir) as
-           
+
 -----------------------------------------------------------
--- exiting the program 
+-- exiting the program
 
 -- | see 'S.exit'
 exit :: Int -> Sh ()
@@ -597,14 +597,14 @@ catches_sh a hs = Sh $ S.catches_sh (unSh a) (fmap convert hs)
           convert (ShellyHandler f) = S.ShellyHandler (unSh . f)
 
 ------------------------------------------------------------
--- convert between Text and FilePath 
+-- convert between Text and FilePath
 
 -- | see 'S.toTextWarn'
 toTextWarn :: FilePath -> Sh Text
 toTextWarn = sh1 S.toTextWarn
 
 -------------------------------------------------------------
--- internal functions for writing extension 
+-- internal functions for writing extension
 
 get :: Sh State
 get = sh0 S.get
diff --git a/test/src/CopySpec.hs b/test/src/CopySpec.hs
index c601c22..7fd476b 100644
--- a/test/src/CopySpec.hs
+++ b/test/src/CopySpec.hs
@@ -14,7 +14,7 @@ import Help
 
 copySpec :: Spec
 copySpec = do
-  let b = "b" 
+  let b = "b"
   let c = "c"
   describe "cp file" $ do
     it "cp to same dir" $
diff --git a/test/src/EnvSpec.hs b/test/src/EnvSpec.hs
index a7c7c42..c342f69 100644
--- a/test/src/EnvSpec.hs
+++ b/test/src/EnvSpec.hs
@@ -32,7 +32,7 @@ envSpec = do
         setenv "SHELLY" "test"
         get_env_text "SHELLY"
       assert $ res == "test"
- 
+
   describe "get_env \"PATH\" (OS compatibility test)" $ do
     it "get_env" $ do
       res <- shelly $ get_env "PATH"
diff --git a/test/src/MoveSpec.hs b/test/src/MoveSpec.hs
index 606006c..a975a7c 100644
--- a/test/src/MoveSpec.hs
+++ b/test/src/MoveSpec.hs
@@ -5,7 +5,7 @@ import Help
 
 moveSpec :: Spec
 moveSpec = do
-    let b = "b" 
+    let b = "b"
     let c = "c"
     describe "mv file" $ do
       it "to same dir" $ do
@@ -15,7 +15,7 @@ moveSpec = do
             mv b c
             readfile c
         res @?= "testing"
-    
+
       it "to other dir" $ do
         res <- shelly $
           within_dir "test/a" $ do
@@ -24,7 +24,7 @@ moveSpec = do
             mv b c
             readfile "c/b"
         res @?= "testing"
-    
+
     describe "mv dir" $ do
       it "to dir does not exist: create the to dir" $ do
         res <- shelly $
@@ -36,7 +36,7 @@ moveSpec = do
             liftIO $ assert cIsDir
             test_f "c/d"
         assert res
-    
+
       it "to dir exists: creates a nested directory, full to path given" $ do
         res <- shelly $
           within_dir "test/a" $ do
@@ -50,7 +50,7 @@ moveSpec = do
             liftIO $ assert bIsDir
             test_f "c/b/d"
         assert res
-    
+
       it "to dir exists: creates a nested directory, partial to path given" $ do
         res <- shelly $
           within_dir "test/a" $ do
@@ -64,7 +64,7 @@ moveSpec = do
             liftIO $ assert bIsDir
             test_f "c/b/d"
         assert res
-    
+
       {-
       it "mv the same dir" $ do
         shelly $ do
diff --git a/test/src/ReadFileSpec.hs b/test/src/ReadFileSpec.hs
index 0a7b4bb..0624a46 100644
--- a/test/src/ReadFileSpec.hs
+++ b/test/src/ReadFileSpec.hs
@@ -16,8 +16,8 @@ readFileSpec = describe "file with invalid encoding" $ do
     it "readBinary" $ do
       res <- shelly $ readBinary "test/data/zshrc"
       assert (BS.length res > 0)
- 
+
     it "readfile" $ do
       res <- shelly $ readfile "test/data/zshrc"
       assert (T.length res > 0)
- 
+
diff --git a/test/src/WhichSpec.hs b/test/src/WhichSpec.hs
index f1ea279..cd4aee8 100644
--- a/test/src/WhichSpec.hs
+++ b/test/src/WhichSpec.hs
@@ -11,7 +11,7 @@ whichSpec = describe "which" $ do
     it "recognizes cabal as a path executable" $ do
       res <- shelly $ test_px "find"
       True @?= res
- 
+
     it "cannot find missing exe" $ do
       Nothing <- shelly $ which "alskjdf;ashlva;ousnva;nj"
       assert True