Jeff A. I can certainly look for the output from Java — but that was not the point — nothing was captured to CAPTURE with either scenarios. B. I tried changing case — that did not solve the problem.
The issue remains — when I execute the system command, the text output that I presented below is not being displayed. Is there a way to capture that output? If so, I can certainly figure out how to parse it. Dennis Dennis Fisher MD P < (The "P Less Than" Company) Phone / Fax: 1-866-PLessThan (1-866-753-7784) www.PLessThan.com <http://www.plessthan.com/> > On Nov 9, 2019, at 9:28 AM, Jeff Newmiller <jdnew...@dcn.davis.ca.us> wrote: > > I am mystified by your description. > > A) If java is not installed, the operating system or system shell will be the > source of any error associated with attempting to invoke it. That means the > error message could be anything, but I find it quite surprising that the > message emitted by the OS would mention "runtime". In any event, look for the > output you can rely on from java for positive identification rather than > looking for any consistent pattern in the error messages for negative > confirmation. > > B) Many OS command shells are case-sensitive... asking for the "Java" program > is in that case different than asking for the "java" program. > > On November 9, 2019 8:51:43 AM PST, Dennis Fisher <fis...@plessthan.com> > wrote: >> R 3.6.3 >> OSX and Windows >> >> Colleagues >> >> I want to identify if Java is installed on a particular computer. >> >> When I execute >> Java -version >> in a terminal (OSX), but not in R, there are two outcomes: >> >> Java installed yields: >> java version "13.0.1" 2019-10-15 >> Java(TM) SE Runtime Environment (build 13.0.1+9) >> Java HotSpot(TM) 64-Bit Server VM (build 13.0.1+9, mixed mode, >> sharing) >> >> Java not installed yields: >> No Java runtime installed >> >> I assume that there are comparable outputs in Windows. >> >> I would like to capture this output in R using the system command, then >> search for “No Java runtime installed” )or the correponding text in >> Windows). >> >> I execute something like: >> CAPTURE <- system("Java -version", intern=TRUE, ignore.stderr=FALSE, >> ignore.stdout=FALSE) >> (with various permutations of TRUE/FALSE for the options) but I cannot >> capture what is displayed on the console. >> >> I have also tried “system2” with various TRUE/FALSE permutations >> without success. >> >> Any clever ideas? >> >> Dennis >> >> Dennis Fisher MD >> P < (The "P Less Than" Company) >> Phone / Fax: 1-866-PLessThan (1-866-753-7784) >> www.PLessThan.com >> >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> 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. > > -- > Sent from my phone. Please excuse my brevity. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
