Re: [Rd] Problem with system2(), directing STDERR to a file

From: Keith Satterley <keith_at_wehi.edu.au>
Date: Thu, 11 Nov 2010 14:33:43 +1100

Looking at help for tempfile,

"tempfile" returns a vector of character strings which can be used as names for temporary files.  

and

 For "tempfile" a character vector giving the names of possible

     (temporary) files. Note that no files are generated by "tempfile".

try a file.create(t) after tempfile()

cheers,

Keith

Dan Tenenbaum wrote:
> According to ?system2, I should be able to direct the output of STDERR to a
> file by giving the filename as a character vector to the "stderr" argument.
>
> But here is what happens.
>
> Given a ruby script test.rb (with its executable bit set):
>
> #!/usr/bin/env ruby
> STDOUT.puts "stdout"
> STDERR.puts "stderr"
>
> And the following R code:
>
>
>> t <- tempfile()
>> res <- system2("./test.rb", stdout=TRUE, stderr=t)
>>
> stderr
>
>> res
>>
> [1] "stdout"
>
>> file.exists(t)
>>
> [1] FALSE
>
> I would expect the file t to exist and contain "stderr", and I would expect
> not to see "stderr" in the console.
>
> Also, there is a typo in the man page - the command is listed as "system" in
> the Description instead of "system2".
>
> The reverse behavior does work correctly:
>
>> res <- system2("./test.rb", stdout=t, stderr="")
>>
> stderr
>
>> file.exists(t)
>>
> [1] TRUE
>
>
> Thanks!
> Dan
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-devel_at_r-project.org mailing list
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>



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