Re: [R] System exit codes

From: Ranjan Bagchi <ranjan.bagchi_at_frotz.com>
Date: Wed, 30 Jul 2008 12:41:03 -0700 (PDT)

Thank you -- I missed the bit about the invisible attribute. Can this happen with pipe, as well?

> x = readLines(pipe("perl -e 'print \"foo\\\n\";exit(-1);'"))
> x

[1] "foo"

I'd want to know that the command failed so I can process x differently.

Thanks again,

Ranjan Bagchi

On Wed, 30 Jul 2008, Prof Brian Ripley wrote:

> On Wed, 30 Jul 2008, Ranjan Bagchi wrote:
>
>> Hi --
>>
>> Is there a way of detecting the exit code while calling system or pipe?
>
> Yes, see the help page (you are ignoring the return value).
>
>> print(system("perl -e 'print \"foo\\\n\";exit(-1);'"))
> foo
> [1] 65280
>
> (= 256*255)
>
>> eg (on Unix)
>>
>>> system("perl -e 'print \"foo\\\n\";exit(-1);'")
>> foo
>>
>> Any help appreciated,
>>
>> Ranjan
>>
>> ______________________________________________
>> R-help_at_r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
> PLEASE do.
>
>
> --
> Brian D. Ripley, ripley_at_stats.ox.ac.uk
> Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
> University of Oxford, Tel: +44 1865 272861 (self)
> 1 South Parks Road, +44 1865 272866 (PA)
> Oxford OX1 3TG, UK Fax: +44 1865 272595
>
>



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