[R] System exit codes

[Ranjan Bagchi]

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
>
>