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===== SCREEN =====

With "screen" you can run a shell in background (for e. g. running scripts), but when shell terminates, screen still runs!

You can start screen by executing

  screen
or
  screen -S some-session-name
  
Optional: Start logging (each command executed in screen will be written to a file such as "screenlog.0" in the home directory of the screen executing user):

  ctrl + a , H
  
If you are running screen as root-user you can activate the logging in any path/ folder. If you running the logging as non-root, you have to make sure to have write-permissions in the running path! The logging-file "screenlog.0" will be written in the path you started the screen-session.
  
Detach from running screen:

  ctrl + ad

List all screen-sessions:

  screen -ls
  
If there´s just one screen running attach:

  screen -r

If there´s are several screen running and you want to attach to:

1. execute:

  screen -ls
  
Example output:

<code>
root@demo-host:~# screen -ls
There are screens on:
        15893.pts-0.demo-host  (05/27/2016 03:46:27 PM)        (Detached)
        1864.pts-0.demo-host   (05/27/2016 12:27:05 PM)        (Detached)
2 Sockets in /var/run/screen/S-root.
</code>

2. execute:

  screen -r 1864.pts-0.demo-host
or
  screen -r -S 1864.pts-0.demo-host
  
Terminate all screen-sessions:

  screen -X quit

Terminate single screen-session:

  screen -X -S ID quit
  
Example:

  screen -X -S 1864.pts-0.demo-host quit
  
Attach to an already attached session (e. g. after network disconnect):

  screen -rd
  screen -r -d 30608