% File src/library/base/man/commandArgs.Rd
% Part of the R package, http://www.R-project.org
% Copyright 1995-2007 R Core Team
% Distributed under GPL 2 or later

\name{commandArgs}
\alias{commandArgs}
\title{Extract Command Line Arguments}
\description{
  Provides access to a copy of the command line arguments supplied when
  this \R session was invoked.
}
\usage{
commandArgs(trailingOnly = FALSE)
}
\arguments{
  \item{trailingOnly}{logical.  Should only arguments after
    \option{--args} be returned?}
}
\details{
  These arguments are captured before the standard \R command line
  processing takes place.  This means that they are the unmodified
  values.  This is especially useful with the \option{--args}
  command-line flag to \R, as all of the command line after that flag
  is skipped.
}
\value{
  A character vector containing the name of the executable and the
  user-supplied command line arguments.  The first element is the name
  of the executable by which \R was invoked.  The exact form of this
  element is platform dependent: it may be the fully qualified name, or
  simply the last component (or basename) of the application, or for an
  embedded \R it can be anything the programmer supplied.

  If \code{trailingOnly = TRUE}, a character vector of those arguments
  (if any) supplied after \option{--args}.
}
\seealso{\code{\link{Startup}}
#ifdef unix
\code{\link{BATCH}}
#endif
}
\examples{
commandArgs()
## Spawn a copy of this application as it was invoked,
## subject to shell quoting issues
## system(paste(commandArgs(), collapse = " "))
}
\keyword{environment}
\keyword{sysdata}
\keyword{programming}