System

usleep : (i : Int) -> {auto prf : So (i >= fromInteger 0 && Delay (i <= fromInteger 1000000))} -> IO ()

Specify interval to sleep for, must be in range [0, 1000000]

unsetEnv : String -> IO Bool

Unsets an environment variable.
Returns true if the variable was able to be unset.

time : IO Integer

Get the numbers of seconds since 1st January 1970, 00:00 UTC

system : String -> IO Int

setEnv : String -> String -> IO Bool

Sets an environment variable with a given value.
Returns true if the operation was successful.

getEnvironment : IO (List (String, String))

getEnv : String -> IO (Maybe String)

Retrieves a value from the environment if the given key is present,
otherwise it returns Nothing.

exitWith : (code : ExitCode) -> IO a

Terminate the program with an ExitCode. This code indicates the
success of the program's execution, and returns the success code
to the program's caller.

code

The ExitCode for program.

exitSuccess : IO a

Exit the program after a successful run.

exitFailure : IO a

Exit the program indicating failure.

exit : Int -> IO a

Quit with a particular exit code

data ExitCode : Type

Programs can either terminate successfully, or end in a caught
failure.

ExitSuccess : ExitCode

Terminate successfully.

ExitFailure : (errNo : Int) -> {auto prf : So (not (errNo == fromInteger 0))} -> ExitCode

Program terminated for some prescribed reason.

errNo

A non-zero numerical value indicating failure.

prf

Proof that the int value is non-zero.