[R] append lines to a created file

[Rolf Turner]

On 17/12/2008, at 1:43 PM, Jörg Groß wrote:

> hi,
>
> I try to append a line to a file with;
>
> writeLines("xxx", con = "file.txt, sep = "\n")
>
>
> but it always overwrites the existing content.
>
>
> How can I "change" the "mode" of writeLines to append ("a") ?

The help on connections says:

	In general functions using connections will open them if they are not
	open, but then close them again, so to leave a connection open call  
open explicitly.

So do something like:

	zz <- file("file.txt","w")
	writeLines("xxx",con=zz,sep="\n")
	writeLines("A load of dingos' kidneys.",con=zz,sep="\n")
	
	etc.
	etc.

	close(zz)

But why not just use sink() and cat()?  Much simpler, IMHO.

	cheers,

		Rolf Turner
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