R: Terminate an R Session

quit {base} | R Documentation

## Terminate an R Session

### Description

The function `quit` or its alias `q` terminate the current R session.

### Usage

    quit(save = "default", status = 0, runLast = TRUE)
       q(save = "default", status = 0, runLast = TRUE)

### Arguments

`save` | a character string indicating whether the environment (workspace) should be saved, one of `"no"`, `"yes"`, `"ask"` or `"default"`.
`status` | the (numerical) error status to be returned to the operating system, where relevant. Conventionally `0` indicates successful completion.
`runLast` | should `.Last()` be executed?

### Details

`save` must be one of `"no"`, `"yes"`, `"ask"` or `"default"`. In the first case the workspace is not saved, in the second it is saved and in the third the user is prompted and can also decide not to quit. The default is to ask in interactive use but may be overridden by command-line arguments (which must be supplied in non-interactive use).

Immediately before terminating, `.Last()` is executed if the function `.Last` exists and `runLast` is true. If in interactive use there are errors in the `.Last` function, control will be returned to the command prompt, so do test the function thoroughly. There is a system analogue, `.Last.sys()`, which is run after `.Last()` if `runLast` is true.

Exactly what happens at termination of an R session depends on the platform and GUI interface in use. A typical sequence is to run `.Last()` and `.Last.sys()` (unless `runLast` is false), to save the workspace if requested (and in most cases also to save the session history: see `savehistory`), then run any finalizers (see `reg.finalizer`) that have been set to be run on exit, close all open graphics devices, remove the session temporary directory and print any remaining warnings (e.g. from `.Last()` and device closure).

Some error statuses are used by R itself. The default error handler for non-interactive use effectively calls `q("no", 1, FALSE)` and returns error code 1. Error status 2 is used for R ‘suicide’, that is a catastrophic failure, and other small numbers are used by specific ports for initialization failures. It is recommended that users choose statuses of 10 or more.

Valid values of `status` are system-dependent, but `0:255` are normally valid. (Many OSes will report the last byte of the value, that is report the number modulo 256. But not all.)

### References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

### See Also

`.First` for setting things on startup.

### Examples

    ## Not run: ## Unix-flavour example
    .Last <- function() {
      cat("Now sending PostScript graphics to the printer:\n")
      system("lpr Rplots.ps")
      cat("bye bye...\n")
    }
    quit("yes")
    ## End(Not run)

[Package base version 2.15.1 Index]