"I guess you all know this: you are connected to your server
with SSH and in the middle of compiling some software (e.g. a new
kernel) or doing some other task which takes lots of time, and
suddenly your connection drops for some reason, and you lose your
labour. This can be very annoying, but fortunately there is a small
utility called screen which lets you reattach to a previous session
so that you can finish your task. This short tutorial shows how to
use screen for just this purpose..."