Ответ 1
Параметры -D -R
заставят экран попытаться отсоединить или создать при необходимости.
screen -D -R -S ipad
Я рекомендую вам взглянуть на все опции -d|D -r|-R|-RR
в руководстве по экрану, так как есть много похожих результатов.
-d -r
Reattach a session and if necessary detach it first.
-d -R
Reattach a session and if necessary detach or even create it first.
-d -RR
Reattach a session and if necessary detach or create it. Use the first session if more than
one session is available.
-D -r
Reattach a session. If necessary detach and logout remotely first.
-D -R
Attach here and now. In detail this means: If a session is running, then reattach. If necessary
detach and logout remotely first. If it was not running create it and notify the user. This is
the author favorite.
-D -RR
Attach here and now. Whatever that means, just do it.
Note: It is always a good idea to check the status of your sessions by means of "screen -list".