[R] shell()/system() question

Prasad, Rajiv Rajiv.Prasad at pnl.gov
Wed Nov 28 21:28:54 CET 2001

> -----Original Message-----
> From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk]
> Sent: Wednesday, November 28, 2001 12:13 PM
> To: Prasad, Rajiv
> Cc: R-Help (E-mail)
> Subject: Re: [R] shell()/system() question
> On Wed, 28 Nov 2001, Prasad, Rajiv wrote:
> > Hi folks:
> >
> > How do I get shell() or system() to run external programs 
> > in a particular
> > directory (different from the current R working directory)?
> Give the full path.

Guess I did not specify the problem entirely.  Apologies.  I'll try again.

The "program" that I am trying to run accesses files stored in the same
directory where it is run, and produces output to stdout, which I am trying
to capture directly into R via shell().  This works well if the current
working directory in R is the same as where the program to be run is
located.  If not, the program fails since it cannot access its supporting
data files.

Since my earlier mail, I figured a workaround, using getwd() and setwd() to
temporarily change the R working directory, run the program using shell(),
and reset the R working directory to where it originally was.  Works via a
wrapper function.

Just wondering if shell() or system() may be provided with a "wd" argument?
Not a big deal, since the wrapper is easy to write.

Thanks for your quick reply.

Rajiv Prasad
Postdoctoral Research Associate, Hydrology Group
Pacific Northwest National Laboratory, P.O. Box 999, MSIN K9-33
Richland, WA 99352
Voice: (509) 375-2096  Fax: (509) 372-6089  Email: rajiv.prasad at pnl.gov
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