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#ifdef unix
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#ifdef unix
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\section{Stdout and stderr}{
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\section{Stdout and stderr}{
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  For command-line \R, error messages written to \file{stderr} will be
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  For command-line \R, error messages written to \file{stderr} will be
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  sent to the terminal unless \code{ignore.stderr = TRUE}.  They can be
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  sent to the terminal unless \code{ignore.stderr = TRUE}.  They can be
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  captured (in the most likely shells) by
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  captured (in the most likely shells) by
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\preformatted{
 - 
 
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    system("some command 2>&1", intern = TRUE)
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\preformatted{    system("some command 2>&1", intern = TRUE)
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}
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}
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  For GUIs, what happens to output sent to \file{stdout} or
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  For GUIs, what happens to output sent to \file{stdout} or
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  \file{stderr} if \code{intern = FALSE} is interface-specific, and it
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  \file{stderr} if \code{intern = FALSE} is interface-specific, and it
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  is unsafe to assume that such messages will appear on a GUI console
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  is unsafe to assume that such messages will appear on a GUI console