Run R script from command line

Question

I have a file, called a.r, it has a chmod of 755,

sayHello <- function(){
   print(\'hello\')
}

sayHello()

Ho

Answer 1

You need the ?Rscript command to run an R script from the terminal.

Check out http://stat.ethz.ch/R-manual/R-devel/library/utils/html/Rscript.html

Example

## example #! script for a Unix-alike

#! /path/to/Rscript --vanilla --default-packages=utils
args <- commandArgs(TRUE)
res <- try(install.packages(args))
if(inherits(res, "try-error")) q(status=1) else q()