Reattach to the session:
screen -r <session_id>
Example:
Create a session, give it a nice name:
user:~$ screen -S nananananana_batman
Close the terminal (detach).
List the active sessions:
user:~$ screen -list There is a screen on: 3151.nananananana_batman (10/23/2013 05:34:02 PM) (Detached) 1 Socket in /var/run/screen/S-user.
Reattach back to our session:
user:~$ screen -S nananananana_batman