getEnv package:unix

getEnv :: String -> IO (Maybe String)
unix System.Posix.Env
getEnv looks up a variable in the environment.
getEnv :: ByteString -> IO (Maybe ByteString)
unix System.Posix.Env.ByteString
getEnv looks up a variable in the environment.
getEnv :: PosixString -> IO (Maybe PosixString)
unix System.Posix.Env.PosixString
getEnv looks up a variable in the environment.
getEnvDefault :: String -> String -> IO String
unix System.Posix.Env
getEnvDefault is a wrapper around getEnv where the programmer can specify a fallback if the variable is not found in the environment.
getEnvironment :: IO [(String, String)]
unix System.Posix.Env
getEnvironment retrieves the entire environment as a list of (key,value) pairs.
getEnvironmentPrim :: IO [String]
unix System.Posix.Env
getEnvDefault :: ByteString -> ByteString -> IO ByteString
unix System.Posix.Env.ByteString
getEnvDefault is a wrapper around getEnv where the programmer can specify a fallback as the second argument, which will be used if the variable is not found in the environment.
getEnvironment :: IO [(ByteString, ByteString)]
unix System.Posix.Env.ByteString
getEnvironment retrieves the entire environment as a list of (key,value) pairs.
getEnvironmentPrim :: IO [ByteString]
unix System.Posix.Env.ByteString
getEnvDefault :: PosixString -> PosixString -> IO PosixString
unix System.Posix.Env.PosixString
getEnvDefault is a wrapper around getEnv where the programmer can specify a fallback as the second argument, which will be used if the variable is not found in the environment.
getEnvironment :: IO [(PosixString, PosixString)]
unix System.Posix.Env.PosixString
getEnvironment retrieves the entire environment as a list of (key,value) pairs.
getEnvironmentPrim :: IO [PosixString]
unix System.Posix.Env.PosixString