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  This will extract the file named \code{file} from the zip archive,
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  This will extract the file named \code{file} from the zip archive,
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  if possible, and write it in a temporary location.
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  if possible, and write it in a temporary location.
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}
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}
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\details{
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\details{
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  The method used is selected by \code{options(unzip=)}. All platforms
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  The method used is selected by \code{options(unzip=)}. All platforms
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  support an \code{"internal"} unzip: this is the default under
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  support an \code{"internal"} unzip: this is the default under Windows
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  Windows and the fall-back under Unix if no \code{unzip}
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  and the fall-back under Unix if no \code{unzip} program was found
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  program was found during configuration and \code{R\_UNZIPCMD} is not set.
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  during configuration and \env{R\_UNZIPCMD} is not set.
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  The file will be extracted if it is in the archive and any required
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  The file will be extracted if it is in the archive and any required
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  \code{unzip} utility is available.  It will probably be extracted to
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  \code{unzip} utility is available.  It will probably be extracted to
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  the directory given by \code{tempdir}, overwriting an existing file of
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  the directory given by \code{tempdir}, overwriting an existing file of
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  that name.
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  that name.