Hey folks 
Is there any way to keep server running after I close the SSH window?
I installed the server using umod 

And also i've installed 3 plugins

Max Players
Auto save
Position

Is there any way to know if they working? Coz in console or chat when I use the Position commands nothing happen

edit

I am using ubuntu 18.04 server

The SSH thing solved. 
I installed screen

sudo apt install screen

then

screen ./start_server.sh