[R] Testing for the existence of a file.

Uwe Ligges ligges at statistik.uni-dortmund.de
Fri Nov 2 08:02:15 CET 2001

Rolf Turner wrote:
> Is there any way to do this (test for the existence of a file)
> in R?  In Splus (3.4) I can do
>         unix(paste("test -r", fnm), output = F)
> where ``fnm'' is a character string giving the pathname of the file.
> This returns 0 if the file exists and 256 if it doesn't.
> I thought in R to do something like
>         system(paste("test -r", fnm), intern =T)
> but this returns ``character(0)'' irrespective of the existence of
> the file.


Uwe Ligges
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