Module System.Environment

getArgs :: IO [String]   

Returns the list of the program's command line arguments. The program name is not included.

Further infos:

• externally defined

getEnv :: String -> IO String   

Returns the value of an environment variable. The empty string is returned for undefined environment variables.

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

Set an environment variable to a value. The new value will be passed to subsequent shell commands (see codesystem/code) and visible to subsequent calls to codegetEnv/code (but it is not visible in the environment of the process that started the program execution).

unsetEnv :: String -> IO ()   

Removes an environment variable that has been set by codesetEnv/code.

getHostname :: IO String   

Returns the hostname of the machine running this process.

Further infos:

• externally defined

getProgName :: IO String   

Returns the name of the current program, i.e., the name of the main module currently executed.

Further infos:

• externally defined

isPosix :: Bool   

Is the underlying operating system a POSIX system (unix, MacOS)?

isWindows :: Bool   

Is the underlying operating system a Windows system?

Further infos:

• externally defined