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

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

Solution 1:

switch(Sys.info()[['sysname']],
Windows= {print("I'm a Windows PC.")},
Linux  = {print("I'm a penguin.")},
Darwin = {print("I'm a Mac.")})

Since it took me more than a trivial amount of time to sort this out, I thought other would benefit as well.

Regards,

• Brian

Solution 2:

I'm not sure about using Sys.info() since the help page says it is not implemented on all R platforms; maybe use .Platform instead? ?.Platform has a lot of useful information, since:

‘.Platform’ is a list with some details of the platform under which R was built. This provides means to write OS-portable R code.

It also seems the packages included with R use .Platform much more frequently than Sys.info.

josh: /c/R/R-2.12.0-src/src/library
> grep ".Platform" */R/* | wc -l
144
josh: /c/R/R-2.12.0-src/src/library
> grep ".Platform\$OS.type" */R/* | wc -l
99
josh: /c/R/R-2.12.0-src/src/library
> grep "Sys.info" */R/* | wc -l
4

Solution 3:

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