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  Extract files from or list a tar archive.
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  Extract files from or list a tar archive.
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}
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}
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\usage{
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\usage{
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untar(tarfile, files = NULL, list = FALSE, exdir = ".",
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untar(tarfile, files = NULL, list = FALSE, exdir = ".",
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      compressed = NA, extras = NULL, verbose = FALSE,
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      compressed = NA, extras = NULL, verbose = FALSE,
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      tar = Sys.getenv("TAR"))
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      restore_times =  TRUE, tar = Sys.getenv("TAR"))
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}
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}
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\arguments{
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\arguments{
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  \item{tarfile}{The pathname of the tar file: tilde expansion (see
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  \item{tarfile}{The pathname of the tar file: tilde expansion (see
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    \code{\link{path.expand}}) will be performed.  Alternatively, a
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    \code{\link{path.expand}}) will be performed.  Alternatively, a
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    \link{connection} that can be used for binary reads.}
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    \link{connection} that can be used for binary reads.}
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    flags such as \option{-p} to be passed to an external \command{tar}
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    flags such as \option{-p} to be passed to an external \command{tar}
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    program.}
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    program.}
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  \item{verbose}{logical: if true echo the command used.}
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  \item{verbose}{logical: if true echo the command used.}
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  \item{restore_times}{logical.  If true (default) restore file
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    modification times.  If false, the equivalent of the \option{-m}
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    flag.  Times in tarballs are supposed to be in UTC, but tarballs are
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    submitted to CRAN with times in the future or far past: this
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    argument allows such times to be discarded.}
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  \item{tar}{character string: the path to the command to be used.  If
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  \item{tar}{character string: the path to the command to be used.  If
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    the command itself contains spaces it needs to be quoted -- but
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    the command itself contains spaces it needs to be quoted -- but
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    \code{tar} can also contain flags separated from the command by spaces.}
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    \code{tar} can also contain flags separated from the command by spaces.}
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}
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}
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