pkgsrc/misc/screen allows that, and much more.

The question is wether you can use it or not (like, system crash and such).
For "normal" use it's just perfect.

-- 
--- TLD
"Oh, how uncomfortable that word must feel on your lips: evil.
  Good...there is no good, there is no evil. There is only flesh,
  and the patterns to which we submit it." [Pinhead]