>
> screen -r 4951
>

only works if the /run/screen entry hasn't been deleted:

  #0us#Dec06Fri22:50#Greg at jocur:/proc/6319/fd#  rm
/run/screen/S-root/6319.pts-10.jocur
  #0us#Dec06Fri22:51#Greg at jocur:/proc/6319/fd#  screen -r 6319.pts-10.jocur
There is no screen to be resumed matching 6319.pts-10.jocur.

reptyr looks good, thank you.  unfortunately in my attempts to hack into
that screen, it died:

  #0us#Dec06Fri22:38#Greg at jocur:/run/screen/S-root#  link 870.pts-0.jocur
/proc/870/fd/4
`870.pts-0.jocur' -> `/proc/870/fd/4'
  #0us#Dec06Fri22:38#Greg at jocur:/run/screen/S-root#  screen -D -RR
Cannot contact screen again. Sigh.

(and it was gone)
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