Not sure exactly what the original poster was after, but for distinguishing when I am working on different machines with different OS, I use something like this:

### Set some state variables
opSys <- Sys.info()["sysname"]
if (opSys == "Windows"){
  linux <- FALSE
} else {
  linux <- TRUE
}

David Scott

On 26/02/2011 10:00 a.m., Ista Zahn wrote:
Hi,

see ?R.version

Something like
if(version$os == "mingw32") {
                path = "/ABC"} else {
                path = "/DEF"
}

might do it, but I'm not sure exactly what possible values version$os
can take or what determines the value exactly.

Best,
Ista


On Fri, Feb 25, 2011 at 1:23 PM, Hui Du<hui...@dataventures.com>  wrote:
Hi All,

                I have two Rs, one has been installed in Windows system and 
another one has been installed under UNIX system. Is there any environmental 
variable or function to tell me which R I am using? The reason that I need to 
know it is under different system, the data path could be different. I want to 
do something like

if it is R under Windows

                path = "/ABC"
else if it is R under UNIX,
                path = "/DEF"

Any idea? Thanks.

Best Regards,

HXD

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David Scott     Department of Statistics
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