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  are pushed back are read prior to the normal input from the
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  are pushed back are read prior to the normal input from the
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  connection, by the normal text-reading functions such as
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  connection, by the normal text-reading functions such as
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  \code{\link{readLines}} and \code{\link{scan}}.
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  \code{\link{readLines}} and \code{\link{scan}}.
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  Pushback is only allowed for readable connections.
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  Pushback is only allowed for readable connections.
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  Not all uses of connections respect pushbacks, in particular the input
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  connection is still wired directly, so for example parsing
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  commands from the console and \code{\link{scan}("")} ignore pushbacks on
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  \code{\link{stdin}}.
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}
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}
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\value{
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\value{
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  \code{pushBack} returns nothing.
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  \code{pushBack} returns nothing.
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  \code{pushBackLength} returns number of lines currently pushed back.
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  \code{pushBackLength} returns number of lines currently pushed back.