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Within LTS Haskell 24.16 (ghc-9.10.3)

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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 :: OsString -> IO (Maybe OsString)

   process	System.Process.Environment.OsString

   getEnv for OsString. @since X.Y.Z

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

   unix	System.Posix.Env

   getEnv looks up a variable in the environment.

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

   unix	System.Posix.Env.ByteString

   getEnv looks up a variable in the environment.

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

   unix	System.Posix.Env.PosixString

   getEnv looks up a variable in the environment.

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

   unliftio	UnliftIO.Environment

   Lifted getEnv.

8. 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.

9. getEnv :: IOEnv env env

   ghc	GHC.Data.IOEnv

   No documentation available.

10. getEnv :: CmmParse Env

    ghc	GHC.StgToCmm.ExtCode

    Get the current environment from the monad.

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