|Miscellaneous information about the system environment.|
|getArgs :: IO [String]|
|Computation getArgs returns a list of the program's command line arguments (not including the program name).|
|getProgName :: IO String|
Computation getProgName returns the name of the program as it was invoked.
However, this is hard-to-impossible to implement on some non-Unix OSes, so instead, for maximum portability, we just return the leafname of the program as invoked. Even then there are some differences between platforms: on Windows, for example, a program invoked as foo is probably really FOO.EXE, and that is what getProgName will return.
|getEnv :: String -> IO String|
Computation getEnv var returns the value of the environment variable var.
This computation may fail with:
|withArgs :: [String] -> IO a -> IO a|
|withArgs args act - while executing action act, have getArgs return args.|
|withProgName :: String -> IO a -> IO a|
|withProgName name act - while executing action act, have getProgName return name.|
|getEnvironment :: IO [(String, String)]|
getEnvironment retrieves the entire environment as a list of (key,value) pairs.
If an environment entry does not contain an '=' character, the key is the whole entry and the value is the empty string.
|Produced by Haddock version 2.3.0|