System.Environment

Copyright	(c) The University of Glasgow 2001
License	BSD-style (see the file libraries/base/LICENSE)
Maintainer	[email protected]
Stability	provisional
Portability	portable
Safe Haskell	Safe
Language	Haskell2010

getArgs :: IO [String] Source

Computation getArgs returns a list of the program's command line arguments (not including the program name).

getProgName :: IO String Source

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.

getExecutablePath :: IO FilePath Source

Returns the absolute pathname of the current executable.

Note that for scripts and interactive sessions, this is the path to the interpreter (e.g. ghci.)

Since base 4.11.0.0, getExecutablePath resolves symlinks on Windows. If an executable is launched through a symlink, getExecutablePath returns the absolute path of the original executable.

Since: base-4.6.0.0

getEnv :: String -> IO String Source

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.

lookupEnv :: String -> IO (Maybe String) Source

Return the value of the environment variable var, or Nothing if there is no such value.

For POSIX users, this is equivalent to getEnv.

Since: base-4.6.0.0

setEnv :: String -> String -> IO () Source

setEnv name value sets the specified environment variable to value.

Early versions of this function operated under the mistaken belief that setting an environment variable to the empty string on Windows removes that environment variable from the environment. For the sake of compatibility, it adopted that behavior on POSIX. In particular

setEnv name ""

has the same effect as

unsetEnv name

If you'd like to be able to set environment variables to blank strings, use setEnv.

Throws IOException if name is the empty string or contains an equals sign.

Since: base-4.7.0.0

unsetEnv :: String -> IO () Source

unsetEnv name removes the specified environment variable from the environment of the current process.

Throws IOException if name is the empty string or contains an equals sign.

Since: base-4.7.0.0

withArgs :: [String] -> IO a -> IO a Source

withArgs args act - while executing action act, have getArgs return args.

withProgName :: String -> IO a -> IO a Source

withProgName name act - while executing action act, have getProgName return name.

getEnvironment :: IO [(String, String)] Source

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.