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  Use \command{R CMD \var{foo} --help} to obtain usage information on
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  Use \command{R CMD \var{foo} --help} to obtain usage information on
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  utility \code{\var{foo}}, notably the possible \command{options}.
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  utility \code{\var{foo}}, notably the possible \command{options}.
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  The defaults for some of the options to \command{R CMD build} can be
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  The defaults for some of the options to \command{R CMD build} can be
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  set by environment variables \env{_R_BUILD_RESAVE_DATA_} and
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  set by environment variables, e.g., \env{_R_BUILD_RESAVE_DATA_} and
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  \env{_R_BUILD_COMPACT_VIGNETTES_}: see \sQuote{Writing R Extensions}.
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  \env{_R_BUILD_COMPACT_VIGNETTES_}: see \manual{R-exts}{Building package tarballs}.
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  Many of the checks in \command{R CMD check} can be turned off or on by
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  Many of the checks in \command{R CMD check} can be turned off or on by
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  environment variables: see Chapter \sQuote{Tools} of the
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  environment variables: see Chapter \manual{R-ints}{Tools}.
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  \sQuote{R Internals} manual.
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  By default \command{R CMD build} uses the \code{"internal"} option to
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  By default \command{R CMD build} uses the \code{"internal"} option to
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  \code{\link{tar}} to prepare the tarball.  An external \command{tar}
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  \code{\link{tar}} to prepare the tarball.  An external \command{tar}
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  program can be specified by the \env{R_BUILD_TAR} environment
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  program can be specified by the \env{R_BUILD_TAR} environment
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  variable.  This may be substantially faster for very large packages,
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  variable.  This may be substantially faster for very large packages,
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  They make use of a temporary directory specified by the environment
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  They make use of a temporary directory specified by the environment
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  variable \code{TMPDIR} and defaulting to \samp{c:/TEMP}.  Do ensure
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  variable \code{TMPDIR} and defaulting to \samp{c:/TEMP}.  Do ensure
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  that if set forward slashes are used.
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  that if set forward slashes are used.
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}
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}
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\seealso{
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\seealso{
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  The sections on \sQuote{Checking and building packages} and
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  Section \manual{R-exts}{Checking and building packages}.
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  \sQuote{Processing documentation files} in \sQuote{Writing R Extensions}:
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  \code{\link{RShowDoc}("R-exts#Checking-and-building-packages")}.
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}
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}
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\keyword{utilities}
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\keyword{utilities}