> When I do this, I use a simple \r (carriage return).
> I've never known it to fail or be messy, even on
> (ack) MSDOS.

Your code works in the most hostile environment I have available;
emacs shell buffer, running both bash and cmd.exe (both under
Windows).

However, it will *only* work if you have the "repeating" part of the
text string at the beginning of the line, where some apps have it in
the middle, like:

Entries Processed: ______

In that case, I've seen a number of "solutions" using (usually)
backspace, which causes:

Entries Processed:  1^H2^H3^H4...

and so on.  


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