Linux – List processes being run inside a screen (Linux) session

You can run this: ssh -t hostname screen -r 3453 to reconnect. If you want to do it in a loop I use the following in a script.

while true; do
    ssh -t -o BatchMode=yes eeepc-rsi "screen -r 3453"
    sleep 2
done

This works best if you have ssh-keys setup so you can login without typing in your password. I'd also recommend that you look at tmux, a more modern implementation of screen. I actually use the above script with screen. You probably also want to use a named screen session rather than just using the pid like you do in your example.

To run a command when the system boots, schedule it for @reboot in cron. See man 5 crontab for details. This means your crontab line should look like

@reboot screen -m ...

Don't use su for that, put the command in the crontab of the user who should run the command. That way, the user can manage the commands without root's intervention. (But if you wanted to run a command as a system user without letting that system user change the command for security reasons, somethnig like su -c /path/to/command www-data in /etc/rc.local would be better.)

Screen closes a window when its command finishes and terminates the session when its last window is closed. If you want to see the script's output after it's finished, run another command after it to wait for input. For example, to leave the window open until you press Enter in it:

screen sh -c './script.sh; read'

Remember that screen only keeps a finite number of history lines. Unless script.sh sometimes requires interaction, you would be better served by redirecting its output to a file. If it does require interaction, you can use screen's log command to send output to a file (and then it's not a problem if the screen session terminates when it doesn't require input).