[R] Environmental variables

andrew
Mon, 02 Feb 2009 02:43:21 -0000

can you use the system function?

system("echo $PATH")



On Feb 2, 11:10?am, David Epstein <David.Epst... at warwick.ac.uk>
wrote:
> I use a Mac (10.4.11 Mac Os X).
>
> In my .tcshrc I define an environmental variable MY.
> Is it possible to find out its value from inside R? When one loads
> R for Mac OS X Cocoa GUI written by:
> ? ? ? ? Simon Urbanek
> ? ? ? ? Stefano M. Iacus
> are files like .tcshrc read by R?
>
> Can I make the value of this environmental variable available to R?
>
> Sys.getenv() produces a lot of output, with the values of many
environmental
> variables, but not this one.
>
> Do I need a file with the correct value of MY, and have both R and my Unix
> shell read the same file, or is there a better way to proceed? I want to
> avoid duplicating the information in source files, as this can lead to a
> setup that is very hard to maintain.
>
> Thanks for any help.
> David
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