= screen =

screen is a useful tool to keep long time tasks (a.e. magma, matlab) running on a computer without keeping your session online during the whole computation:

 * Initial Start:
   * open a console and connect through SSH to the machine you want to run the task on (most likely: compute.math.uzh.ch) by typing the host name: '''[user@tlX] compute''' and enter your password (there is a script called 'compute' which does nothing else than 'ssh compute' - in our evironment it's not necessary to type 'ssh compute')
   * type '''screen <application name>''' . F.e.: `screen maple` 

 * Detach:

   * to detach from screen ("send it to background"), press '''Ctrl + A + D '''
   * you now can log off from the terminal and your task will keep running

 * Attach again:
   * if you want to check progress of your computations, log into the machine where your task is running like you did before
   * use '''screen -raAd''' to connect to your task