detecting operating system in R (e.g. for adaptive .Rprofile files)

Question

I was wondering how to automatically detect operating system in R, for example to place things in the .Rprofile.

Answer 1

> Sys.info()
                                      sysname 
                                      "Linux" 
                                      release 
                          "2.6.32-26-generic" 
                                      version 
"#48-Ubuntu SMP Wed Nov 24 09:00:03 UTC 2010"