[R] showing available environment variables

[Prof Brian Ripley]

On Wed, 29 Nov 2006, Karin Lagesen wrote:

>
> I have searched through the mailing lists and the docs, and I seem
> completely unable to find a way to make R list all available
> environment variables that it uses.
>
> The reason that I want to do this is the following:
>
> The default program for reading files when using openVignettes on my
> system is ggv. ggv is broken. I would therefore like to use a
> different program, and I found the variable R_PDFVIEWER which should
> do the trick. However, so far no luck.
>
> Therefore, how do I ask R what variables are available, and how do I
> get it to show what it is currently set to.

In this specific case you need to look at the R-admin manual for what 
various variables do, and Sys.getenv("R_PDFVIEWER") or Sys.getenv() for 
the current value or list of values.

R_PDFVIEWER is set in R_HOME/etc/Renviron, and you can override the 
setting via ~/.Renviron (see ?Startup).

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595