[R] Testing for the existence of a file.

[Rolf Turner]

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.

Any ideas?

					cheers,

						Rolf Turner
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