screen: commonly used operation

https://linuxize.com/post/how-to-use-linux-screen/

https://www.mattcutts.com/blog/a-quick-tutorial-on-screen/

-list out the created screens:
screen -ls

create a new screen:
screen -S screen_name

reattach to a existing screen:
screen -r screen_need_to_be_attached

check the current screen:
echo $STY

kill a detached session:
screen -X -S [session name] quit

create a screen to run the program and kill the screen session when the program finished
screen python main.py

General commands:
every screen command starts from ctrl+a, session and window are two different terms, in one session, it can include several windows.