> Anyway,
> thanks for all the experiments, and (to Renaud) support.rstudio.org is
> the place to report such problems.
>

Funny how the post diverged to an RStudio-related issue.
Anyway, I posted a link to this post at support.rstudio.org:
http://support.rstudio.org/help/discussions/problems/9242-cat-with-backspace-and-newline-characters/

>From the user point of view, the following behaviour still feels like a
strange behaviour of the R prompt:

> cat("abc\b\b\b")
> c
(with the cursor now position on the 'c')

I don't know if there is a general official behaviour of prompt characters,
but I think one expects the prompt to always follow whatever is printed by
the previous R command, without corruption of the input line to be.

Renaud

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