[R] Environmental variables

andrew andrewjohnroyal at gmail.com
Mon Feb 2 03:43:21 CET 2009

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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