On 8/24/07, Dirk Eddelbuettel <[EMAIL PROTECTED]> wrote: > On Fri, Aug 24, 2007 at 10:57:46AM -0400, Duncan Murdoch wrote: > > On 8/24/2007 10:33 AM, Dirk Eddelbuettel wrote: > >> On Fri, Aug 24, 2007 at 08:32:00AM -0400, Duncan Murdoch wrote: > >>> On 8/24/2007 6:58 AM, Ronaldo Reis Junior wrote: > >>> > Hi, > >>> > > It is possible to use a shell command inside a R script? > >>> > > I'm write a R script and I like to put somes shell commands inside to > >>> R. > Somethink like: convert fig01.png fig01.xpm or sed ..., etc. > >>> The details and available functions depend on the platform, but you want > >>> to look at ?system, ?shell, and/or ?shell.exec. (These all exist in > >>> Windows; on Unix-alikes, you probably won't have the latter two.) > >> Don't forget pipes. R's ability to consistently work on connections that > >> may be local > >> files, remotes files, program output, ... is a true treasure (and > >> thanks and credits to, I believe, Brian Ripley to make it so). > >> Eg you can do this OD <- read.table(pipe("links -dump > >> http://cran.r-project.org/src/contrib/ | awk '/tar.gz/ {print $3, $4}'"), > >> header=FALSE, col.names=c("file", "date")) > >> to get files and dates of files on CRAN. As I recall, this also works on > >> that other operating system, provided > >> you do all the legwork of installing other tools, setting PATHs etc > >> to provide what works out of the box on the supposedly unfriendlier OS. > > > > The pipe command you list doesn't work in Windows. I'd guess this is > > because the pipe syntax "|" within the command is unsupported: it tries to > > execute "links", with the rest of the line passed as arguments. But I > > haven't traced through to check on this. > > Hm, wishful thinking must have gotten the better of me then. Sorry for > spreading misinformation about the capabilities of that other OS.
This works for me on Windows: > tab <- read.table(pipe("lynx --nolist --dump > http://cran.r-project.org/src/contrib/ | findstr tar.gz"), as.is = TRUE) > head(tab[3:5]) V3 V4 V5 1 ADaCGH_1.3-1.tar.gz 14-May-2007 12:04 2 AIS_1.0.tar.gz 31-Jul-2007 16:38 3 AMORE_0.2-10.tar.gz 11-Apr-2007 10:17 4 ARES_1.2-2.tar.gz 19-Mar-2007 20:53 5 AcceptanceSampling_0.1-1.tar.gz 07-Jul-2007 20:46 6 AdaptFit_0.2-1.tar.gz 04-Aug-2007 09:51 ______________________________________________ R-help@stat.math.ethz.ch 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.