[R] capturing output from Win 98 shell
ligges at statistik.uni-dortmund.de
Tue Aug 12 17:21:34 CEST 2003
Simon Fear wrote:
> Uwe, you suggest
>>So you almost got it, just read ?shell carefully enough:
>> filenames <- shell("dir D:\\tmp\\*.sasb7dat /b", intern = TRUE)
> Unfortunately, this does not work and is why I wrote to Rhelp (OK I used
> system instead of shell, but I tried shell first); here filenames is
> character(0) even though the dir output is not empty.
(sure about "intern = TRUE" ?)
Hmmm. It works on WinNT, and I cannot check a DOS based OS like Win98,
because we don't have any of those DOS based operating systems in our
> Believe me I did read ?shell many times before I wrote: but I am
> that shell does not do what ?shell says it should.
>>or even better in this case:
>> filenames <- list.files("d:/tmp", pattern = "sasb7dat")
> THANK YOU! I'm always forgetting about file.* and friends. Platform
> independent too.
> Still leaves me asking the bigger question though: how do I capture DOS
> command output in general?
Or, to come back to Peter's suggestion, the help file ?system tells us:
"... (To use DOS internal commands use
[Peter, we don't need to be experts to read this on Windows -- even with
that heatwave in Dortmund ... ;-)]
So we get:
filenames <- system(paste(Sys.getenv("COMSPEC"), "/c", "dir /b"),
intern = TRUE)
but that's the same way shell() works, so I woudn't expect this to work
when shell() doesn't...
> Simon Fear
> Senior Statistician
> Syne qua non Ltd
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