[R] Environmental variables

Charles C. Berry cberry at tajo.ucsd.edu
Mon Feb 2 05:16:52 CET 2009

On Sun, 1 Feb 2009, David Epstein 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?

Did you try starting the R GUI from the command line whilst using tcsh?

<username>% /Applications/R.app/Contents/MacOS/R &

The R GUI when started by launch'ing it picks up different environment 
vars than when starting it from a shell.

And Sys.getenv() would show them.



p.s. R-sig-mac is a better place for this question.

> 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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Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901

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