Re: [R] Runing R in a bash script Ulrik Stervbo wrote:  > Hello!  >  > I am having issues trying to plot to a ong (or jpg)  when the R-code in a  > bash script is executed from cron.  >  > I can generate a pdf file, but when I try to write to a png, the file is  > created, but nothing is written. If I execute the bash script from my  > console, everything works file. Any ideas?  >  > In my cron I have SHELL=/bin/bash - otherwise /bin/shell is used and the  > folowing enery, so example is executed every minute  > * * * * * [path]/example.sh  >  > I am running  > R version 2.4.1 (2006-12-18)  >  > Here's a minimal example - two files one R-script ('example.r') and one  > bash-script ('example.sh')  >  > example.r  > # Example R-script  > x <- c(1:10)  > y <- x^2  > png(file="example2.png")  > #pdf(file="example2.pdf")  > plot(x,y)  > graphics.off()  >  > example.sh  > #/bin/bash  > #  > # Hello world is written to exhotext every time cron executes this script  > echo "Hello world" > echotext  > # This works, but not when executed from cron  > n=`R --save < example.r`  > # using exec as in `exec R --save < example.r` dosent work with cron  either  > # This also works, but nothing is written to the png when executed  from cron  > R --save < x <- c(1:10)  > y <- x^2  > png(file="example2.png")  > #pdf(file="example2.pdf")  > plot(x,y)  > graphics.off()  > #dev.off() dosent work at all when executed from cron  > RSCRIPT The png() device requires an X server for the image rendering. You might  be able to get away with exporting the DISPLAY environment variable export DISPLAY=:0.0 # try and connect to X server on display 0.0 within your script, but it will only work if the script is executed by  the same user as is running the X server, *and* the X server is running  at the time the script is executed. There are a handful of packages that will create a png without the  presence of an X server, and I'm partial to Cairo (since I've done some  work on it). You can install the latest version like this: install.packages("Cairo",,'http://rforge.net/',type='source') Cairo can also outputs nice pdf's with embedded fonts... useful if you  want to embed high-quality OpenType or TrueType fonts. Best, Jeff --  http://biostat.mc.vanderbilt.edu/JeffreyHorner ______________________________________________ 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.