[R] Test internet presence

Prof Brian Ripley ripley at stats.ox.ac.uk
Mon Sep 11 15:26:05 CEST 2006

On Mon, 11 Sep 2006, Ted.Harding at nessie.mcc.ac.uk wrote:

> On 11-Sep-06 Gregor Gorjanc wrote:
> > It seems that 'internal' method was used (I use R 2.3.1 under
> > Linux) as indicated in help page of download.file. I could
> > use wget or lynx methods, but these two must be available,
> > so this is not really portable. Are there any other options
> > for testing internet access? I am thinking that this might be
> > more relevant for R-devel. I will wait a bit
> > before moving there.

Check out tests/internet.R.  nsl() checks if you can resolve host names, 
which has worked well enough there.

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

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