in reply to How to UPDATE rather than append to STDOUT?

As some people have said, \b works for this, but so does \r:
> perl -e "for(1..10){print qq(\r$_.);select undef,undef,undef,0.5}"
Just thought I'd mention it. It depends on exactly what you want done, and if it is anything complex, have a look at suggested modules instead. :)
You have moved into a dark place.
It is pitch black. You are likely to be eaten by a grue.