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Authored by ardumont on Oct 6 2019, 11:49 AM.

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	```
	$ sudo apt install r-base
	```

	```
	#!/usr/bin/Rscript --vanilla

	# This R script:
	# - calls the builtin API to install the versions package
	# if not already installed.
	# - then triggers a version check on the package passed as
	# argument to this script.

	args = commandArgs(trailingOnly=TRUE)

	if (length(args)==0) {
	stop("Must supplied one argument (package version to list version from).n", call.=FALSE)
	}

	# install idempotently an R pkg (no debian package for it yet)
	pkgLoad <- function(pkg) {
	if (!require(pkg, character.only = TRUE)) {
	install.packages(pkg, dep=TRUE)
	if(!require(pkg, character.only = TRUE))
	stop("Package not found")
	}
	suppressPackageStartupMessages(library(pkg, character.only = TRUE))
	}

	pkgLoad('versions')

	versions::available.versions(args[1])

	```

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