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  If no expression is provided, i.e., the call is \code{on.exit()}, then
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  If no expression is provided, i.e., the call is \code{on.exit()}, then
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  the current \code{on.exit} code is removed.
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  the current \code{on.exit} code is removed.
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}
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}
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\usage{
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\usage{
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on.exit(expr = NULL, add = FALSE)
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on.exit(expr = NULL, add = FALSE, after = TRUE)
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}
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}
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\arguments{
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\arguments{
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  \item{expr}{an expression to be executed.}
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  \item{expr}{an expression to be executed.}
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  \item{add}{if TRUE, add \code{expr} to be executed after any previously
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  \item{add}{if TRUE, add \code{expr} to be executed after any previously
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    set expressions; otherwise (the default) \code{expr} will overwrite
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    set expressions (or before if \code{after} is FALSE); otherwise (the
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    any previously set expressions.}
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    default) \code{expr} will overwrite any previously set expressions.}
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  \item{after}{if \code{add} is TRUE and \code{after} is FALSE, then
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    \code{expr} will be added on top of the expressions that were already
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    registered. The resulting last in first out order is useful for freeing
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    or closing resources in reverse order.}
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}
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}
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\details{
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\details{
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  The \code{expr} argument passed to \code{on.exit} is recorded without
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  The \code{expr} argument passed to \code{on.exit} is recorded without
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  evaluation.  If it is not subsequently removed/replaced by another
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  evaluation.  If it is not subsequently removed/replaced by another
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  \code{on.exit} call in the same function, it is evaluated in the
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  \code{on.exit} call in the same function, it is evaluated in the