NAME

       r - Provides hash-bang (#!) capability for R (www.r-project.org)

SYNOPSIS

       r [options] [-|file] [R arguments]

DESCRIPTION

       Launches GNU R to execute the specified file containing R commands, or takes commands from
       stdin if '-' is used to denote stdin, using the specified options. This makes it  suitable
       to  create  R  scripts  via the so-called shebang '#!/' line. The optional R arguments are
       stored in the R vector argv.

OPTIONS

       -h, --help
              Display a short help list.

       --usage
              Give a short usage message.

       -V, --version
              Show the version number.

       -v, --vanilla
              Pass the '--vanilla' option to R.

       -p, --verbose
              Print the value of expressions to the console.

       -l, --packages list
              Load the R packages from the comma-separated 'list'.

       -t, --rtemp
              Use a per-session temporary directory as R does.

       -q, --quick
              Skip autoload (i.e. delayed assign) of default libraries.

       -i, --interactive
              Force 'interactive()' to evaluate to TRUE, whereas the default is FALSE.

       -e, --eval expr
              Evaluate 'expr' in R.

USAGE

       r can be used in command-line 'pipes' as well as in 'shebang'-style scripts.

EXAMPLES

       Piping R commands:

        echo 'cat(pi^2,"\n")' | r

       Equivalently, R commands can be given on the command-line:

        r -e 'cat(pi^2, "\n")'

       Alternatively, commands can be stored in a  file,  which  in  turn  might  use  R  command
       'readLines' to process stdin input:

        $ cat examples/fsizes.r
        fsizes <- as.integer(readLines())
        print(summary(fsizes))
        stem(fsizes)

       which can be evaluated by r with the following command:

        ls -l /boot | awk '!/^total/ {print $5}' | r examples/fsizes.r

       The script file may contain a "shebang" line:

        $ cat examples/install.r
        #!/usr/bin/env r
        # a simple example to install one or more packages
        if (is.null(argv) | length(argv)<1) {
          cat("Usage: installr.r pkg1 [pkg2 pkg3 ...]0)
          q()
        }
        repos <- "http://cran.us.r-project.org"
        lib.loc <- "/usr/local/lib/R/site-library"
        install.packages(argv, lib.loc, repos, dependencies=TRUE)

       and if it is executable, it can be called as:

        examples/install.r "TeachingDemos"

       See the examples directory in the sources for more.

NOTE

       The  executable  program is called r, but the project is called littler to avoid confusion
       with the real GNU R.

SEE ALSO

       The GNU R language is documented extensively at the R  website  (http://www.r-project.org)
       and in several manuals available in html, info and pdf.

AUTHORS

       Jeffrey Horner <jeff.horner@vanderbilt.edu>.  Dirk Eddelbuettel <edd@debian.org>.