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% File src/library/base/man/commandArgs.Rd
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% Part of the R package, http://www.R-project.org
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% Copyright 1995-2007 R Core Team
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% Distributed under GPL 2 or later
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\name{commandArgs}
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\alias{commandArgs}
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\title{Extract Command Line Arguments}
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\description{
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  Provides access to a copy of the command line arguments supplied when
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  this \R session was invoked.
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}
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\usage{
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commandArgs(trailingOnly = FALSE)
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}
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\arguments{
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  \item{trailingOnly}{logical.  Should only arguments after
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    \option{--args} be returned?}
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}
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\details{
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  These arguments are captured before the standard \R command line
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  processing takes place.  This means that they are the unmodified
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  values.  This is especially useful with the \option{--args}
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  command-line flag to \R, as all of the command line after that flag
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  is skipped.
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}
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\value{
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  A character vector containing the name of the executable and the
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  user-supplied command line arguments.  The first element is the name
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  of the executable by which \R was invoked.  The exact form of this
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  element is platform dependent: it may be the fully qualified name, or
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  simply the last component (or basename) of the application, or for an
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  embedded \R it can be anything the programmer supplied.
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  If \code{trailingOnly = TRUE}, a character vector of those arguments
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  (if any) supplied after \option{--args}.
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}
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\seealso{\code{\link{Startup}}
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#ifdef unix
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\code{\link{BATCH}}
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#endif
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}
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\examples{
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commandArgs()
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## Spawn a copy of this application as it was invoked,
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## subject to shell quoting issues
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## system(paste(commandArgs(), collapse = " "))
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}
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\keyword{environment}
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\keyword{sysdata}
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\keyword{programming}