Colleagues,
I am writing scripts that run on both Windows (Vista) and Linux
(RedHat 9). The scripts will be used in both S-Plus (version 8) and
R (2.6.0). I am trying to use the "status" portion of the quit command:
------------------------------------------------------------------------
-----------------------------------------------------------------------
> quit package: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.
>
>
>
>
> 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.
------------------------------------------------------------------------
-----------------------------------------------------------------------
Of the four combinations (R/S-Plus crossed with Windows/Linux), the
only combination that I cannot get to work properly is R/Windows.
The code below from Linux/R:
> > q(status=34, "no")
> P2: 72> echo $status
> 34
shows the expected response.
When I replicate that R code in Windows, then type:
1. echo %status%: Windows echoes %status, indicating that the
environment variable status was never set
2. echo %error level%: Windows echoes 1 (if i execute a normal quit
command, i.e., without setting status, Windows echoes 0).
So, it appears that in Windows, %errorlevel% is the (undocumented)
equivalent of $status (Linux). However, in Windows, the value
returned appears to be limited to either 0 (normal exit) or 1 (status
set to a non-zero value) despite the claim that "valid values ...
[are] 0:255 (as is the case in Linux).
Does any one have an experience with this? I realize that another
option is to write "status" to a (hidden) file, then read it from the
OS. However, there are reasons why this is not desirable.
Dennis
Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-415-564-2220
www.PLessThan.com
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