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Within LTS Haskell 22.21 (ghc-9.6.5)

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1. getEnv :: String -> IO String

   base	System.Environment

   Computation getEnv var returns the value of the environment variable var. For the inverse, the setEnv function can be used. This computation may fail with:

   • isDoesNotExistError if the environment variable does not exist.

2. getEnv :: String -> IO (Maybe String)

   base	System.Environment.Blank

   Similar to lookupEnv.

3. getEnv :: String -> IO (Maybe String)

   unix	System.Posix.Env

   getEnv looks up a variable in the environment.

4. getEnv :: ByteString -> IO (Maybe ByteString)

   unix	System.Posix.Env.ByteString

   getEnv looks up a variable in the environment.

5. getEnv :: PosixString -> IO (Maybe PosixString)

   unix	System.Posix.Env.PosixString

   getEnv looks up a variable in the environment.

6. getEnv :: MonadIO m => String -> m String

   unliftio	UnliftIO.Environment

   Lifted getEnv.

7. getEnv :: String -> IO String

   base-compat	System.Environment.Compat

   Computation getEnv var returns the value of the environment variable var. For the inverse, the setEnv function can be used. This computation may fail with:

   • isDoesNotExistError if the environment variable does not exist.

8. getEnv :: IOEnv env env

   ghc	GHC.Data.IOEnv

   No documentation available.

9. getEnv :: CmmParse Env

   ghc	GHC.StgToCmm.ExtCode

   Get the current environment from the monad.

10. getenv :: (HasCallStack, MonadIO m) => [Char] -> m (Maybe [Char])

    gi-glib	GI.GLib.Functions

    Returns the value of an environment variable. On UNIX, the name and value are byte strings which might or might not be in some consistent character set and encoding. On Windows, they are in UTF-8. On Windows, in case the environment variable's value contains references to other environment variables, they are expanded.

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