Hello,

I'm trying to run a script that opens the background screen through crontab. the command i used to open the screen ' screen -S test'

It gives me an error 'Must be connected to a terminal' and terminates the screen.

Kindly assist me please

That is because you are doing something cron was never intended to do.
Depending upon how you set up crontab, you either start something as root or as the user. In either case, it runs in a new session that does not own a display. You would need to give it permissions to a display, set that display as the default in its environment, and ensure that the specific display was current and running when it starts.
If that sounds like a lot of trouble, it is. It can be done, but seems pretty silly. Why do you want to start a GUI process in a non-gui cron environment? What is your true objective?

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