Scripting Front-End for R

Description

This is an alternative front end for use in #! scripts and other scripting applications.

Usage

Rscript [options] [-e expression] file [args]

Arguments

Details

Rscript --help gives details of usage, and Rscript --version gives the version of Rscript.

Other invocations invoke the R front-end with selected options. This front-end is convenient for writing #! scripts since it is an executable and takes file directly as an argument. Options --slave --no-restore are always supplied: these imply --no-save.

Either one or more -e options or file should be supplied. When using -e options be aware of the quoting rules in the shell used: see the examples.

Additional options accepted (before file or args) are

--verbose

gives details of what Rscript is doing. Also passed on to R.

--default-packages=list

where list is a comma-separated list of package names or NULL. Sets the environment variable R_DEFAULT_PACKAGES which determines the packages loaded on startup. The default for Rscript omits methods as it takes about 60% of the startup time.

Normally the version of R is determined at installation, but this can be overridden by setting the environment variable RHOME.

stdin() refers to the input file, and file("stdin") to the stdin file stream of the process.

Note

Rscript is only supported on systems with the execv system call.

Examples

## Not run: 
Rscript -e 'date()' -e 'format(Sys.time(), "%a %b %d %X %Y")'

## 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()


## End(Not run)