> Date: Thu, 01 Mar 2001 14:30:32 +0100
> To: R Help list <r-help at stat.math.ethz.ch>
> From: Christian Hoffmann <christian.hoffmann at wsl.ch>
> Subject: [R] Using csh
>
> Hi all,
>
> I am fancying the idea of using my preferred shell (t)csh when invoking
> system(). How can I do that? (I didn't find anything about that in the
FAQ).
>
It's not an R issue. On Unix/Linux (I am presuming), R's system calls
calls the C calls system or popen. What shell system(3) calls is OS-specific,
and in the case of Solaris, argument-specific too.
Also, system() is used a lot by R itself, so you don't want to risk
breaking that.
Here is a workaround: you need to do it this way to avoid quoting issues.
shell <- function(command, shell="tcsh", ...)
{
input <- tempfile("in")
on.exit(unlink(input))
cat(command, "\n", sep="", file=input)
system(paste(shell, input), ...)
}
The Windows version has a shell() command: is there enough need for
something like this on Unix? (The granddaddy is unix.shell(),
I think from S3.)
--
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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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