[R] Testing for the existence of a file.

Kurt Hornik Kurt.Hornik at ci.tuwien.ac.at
Fri Nov 2 08:33:24 CET 2001

>>>>> Rolf Turner writes:

> 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.

Use file.exists() to find out whether a file exists.

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