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Rev 88336 Rev 88977
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  Argument \code{extra_flags} is passed to an external \command{tar} and
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  Argument \code{extra_flags} is passed to an external \command{tar} and
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  so is platform-dependent.  Possibly useful values include \option{-h}
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  so is platform-dependent.  Possibly useful values include \option{-h}
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  (follow symbolic links, also \option{-L} on some platforms),
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  (follow symbolic links, also \option{-L} on some platforms),
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  \samp{--acls}, \option{--exclude-backups}, \option{--exclude-vcs} (and
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  \samp{--acls}, \option{--exclude-backups}, \option{--exclude-vcs} (and
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  similar) and on Windows \option{--force-local} (so drives can be
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  similar) and on Windows \option{--force-local} (so drives can be
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  included in filepaths: this used to be the default for \R on Windows).
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  included in filepaths: this used to be the default for \R on
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  Windows).  \command{bsdtar} from \code{libarchive} (the current
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  default \command{tar} on macOS) supports \option{--no-xattrs} to
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  exclude \sQuote{extended file attributes} (sometimes reported by GNU
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  \command{tar} as \sQuote{extended header keyword}).
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  A convenient and robust way to set options for GNU \command{tar} is via
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  A convenient and robust way to set options for GNU \command{tar} is via
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  environment variable \env{TAR_OPTIONS}.  Appending \option{--force-local}
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  environment variable \env{TAR_OPTIONS}.  Appending \option{--force-local}
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  to \env{TAR} does not work with GNU \command{tar} due to restrictions on
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  to \env{TAR} does not work with GNU \command{tar} due to restrictions on
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  how some options can be mixed.  The \command{tar} available on Windows 10
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  how some options can be mixed.  The \command{tar} available on Windows 10