\Header{source}{Redirect Input}
\keyword{file}{source}
\keyword{programming}{source}
\begin{Description}\relax
\code{source} causes \R{} to accept its input from the named file (the
name must be quoted). Input is read from that file until the end of
the file is reached.   \code{\Link{parse}} is used to scan the
expressions in, they are then evaluated sequentially in the chosen
environment.\end{Description}
\begin{Usage}
\begin{verbatim}
source(file, local = FALSE, echo = verbose, print.eval = echo,
       verbose = getOption("verbose"),  prompt.echo = getOption("prompt"),
       max.deparse.length = 150, chdir = FALSE)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{file}] character; the name of the file to read from (quoted).
\item[\code{local}] if \code{local} is \code{FALSE}, the statements scanned
are evaluated in the global environment, otherwise in the local
calling source.
\item[\code{echo}] logical; if \code{TRUE}, each expression is printed
after parsing, before evaluation.
\item[\code{print.eval}] logical; if \code{TRUE}, the result of
\code{eval(i)} is printed for each expression \code{i}; defaults
to \code{echo}.
\item[\code{verbose}] if \code{TRUE}, more diagnostics (than just
\code{echo = TRUE}) are printed during parsing and evaluation of
input, including extra info for \bold{each} expression.
\item[\code{prompt.echo}] character; gives the prompt to be used if
\code{echo = TRUE}.
\item[\code{max.deparse.length}] integer; is used only if \code{echo} is
\code{TRUE} and gives the maximal length of the ``echo'' of a
single expression.
\item[\code{chdir}] logical; if \code{TRUE}, the R working directory is
changed to the directory containing \code{file} for evaluating.
\end{ldescription}
\end{Arguments}
\begin{SeeAlso}\relax
\code{\Link{demo}} which uses \code{source};
\code{\Link{eval}}, \code{\Link{parse}} and \code{\Link{scan}}; \code{\Link{options}("keep.source")}.\end{SeeAlso}

