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)
.Last <- function(x) { ...... }

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, the function .Last() is executed if it 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.

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)

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