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  This function can be used to download a file from the Internet.
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  This function can be used to download a file from the Internet.
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}
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}
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\usage{
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\usage{
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download.file(url, destfile, method, quiet = FALSE, mode = "w",
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download.file(url, destfile, method, quiet = FALSE, mode = "w",
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              cacheOK = TRUE,
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              cacheOK = TRUE,
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              extra = getOption("download.file.extra"), \dots)
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              extra = getOption("download.file.extra"),
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              headers = NULL, \dots)
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}
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}
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\arguments{
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\arguments{
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  \item{url}{a \code{\link{character}} string (or longer vector e.g.,
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  \item{url}{a \code{\link{character}} string (or longer vector e.g.,
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    for the \code{"libcurl"} method) naming the URL of a resource to be
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    for the \code{"libcurl"} method) naming the URL of a resource to be
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    downloaded.}
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    downloaded.}
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  \item{cacheOK}{logical.  Is a server-side cached value acceptable?}
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  \item{cacheOK}{logical.  Is a server-side cached value acceptable?}
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  \item{extra}{character vector of additional command-line arguments for
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  \item{extra}{character vector of additional command-line arguments for
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    the \code{"wget"} and \code{"curl"} methods.}
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    the \code{"wget"} and \code{"curl"} methods.}
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  \item{headers}{named character vector of HTTP headers to use in HTTP
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    requests.  It is ignored for non-HTTP URLs.  The \code{User-Agent}
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    header, coming from the \code{HTTPUserAgent} option (see
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    \code{\link{options}}) is used as the first header, automatically.}
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  \item{\dots}{allow additional arguments to be passed, unused.}
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  \item{\dots}{allow additional arguments to be passed, unused.}
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}
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}
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\details{
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\details{
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  The function \code{download.file} can be used to download a single
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  The function \code{download.file} can be used to download a single
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  file as described by \code{url} from the internet and store it in
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  file as described by \code{url} from the internet and store it in