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diff --git a/bin/AddPath.hs b/bin/AddPath.hs
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+-- |
+-- Copyright   : (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+-- License     : MIT
+-- Maintainer  : Egor.Tensin@gmail.com
+-- Stability   : experimental
+-- Portability : Windows-only
+
+module Main (main) where
+
+import Control.Monad   (void, when)
+import Control.Monad.Trans.Except (catchE, runExceptT, throwE)
+import Data.List       (union)
+import System.IO.Error (ioError, isDoesNotExistError)
+
+import Options.Applicative
+
+import qualified WindowsEnv
+
+import Prompt
+import PromptMessage
+
+data Options = Options
+    { optName   :: WindowsEnv.VarName
+    , optYes    :: Bool
+    , optGlobal :: Bool
+    , optPaths  :: [WindowsEnv.VarValue]
+    } deriving (Eq, Show)
+
+optionParser :: Parser Options
+optionParser = Options
+    <$> optNameDesc
+    <*> optYesDesc
+    <*> optGlobalDesc
+    <*> optPathsDesc
+  where
+    optNameDesc = strOption
+         $ long "name" <> short 'n'
+        <> metavar "NAME" <> value "PATH"
+        <> help "Variable name ('PATH' by default)"
+    optYesDesc = switch
+         $ long "yes" <> short 'y'
+        <> help "Skip confirmation prompt"
+    optGlobalDesc = switch
+         $ long "global" <> short 'g'
+        <> help "Add for all users"
+    optPathsDesc = many $ argument str
+         $ metavar "PATH"
+        <> help "Directories to add"
+
+main :: IO ()
+main = execParser parser >>= addPath
+  where
+    parser = info (helper <*> optionParser) $
+        fullDesc <> progDesc "Add directories to your PATH"
+
+addPath :: Options -> IO ()
+addPath options = runExceptT doAddPath >>= either ioError return
+  where
+    varName = optName options
+    pathsToAdd = optPaths options
+
+    forAllUsers = optGlobal options
+    profile
+        | forAllUsers = WindowsEnv.AllUsers
+        | otherwise   = WindowsEnv.CurrentUser
+
+    skipPrompt = optYes options
+
+    emptyIfMissing e
+        | isDoesNotExistError e = return ""
+        | otherwise = throwE e
+
+    doAddPath = do
+        oldValue <- WindowsEnv.query profile varName `catchE` emptyIfMissing
+        let oldPaths = WindowsEnv.pathSplit oldValue
+        let newPaths = oldPaths `union` pathsToAdd
+        when (length oldPaths /= length newPaths) $ do
+            let newValue = WindowsEnv.pathJoin newPaths
+            let promptAnd = if skipPrompt
+                then withoutPrompt
+                else withPrompt $ oldNewMessage profile varName oldValue newValue
+            let engrave = WindowsEnv.engrave profile varName newValue
+            void $ promptAnd engrave