Running gekko in the background with PM2

[Derbeweis]

Thanks again it is very useful.... 
i tried it and it is working.. the one thing i still need is: 
Can I access a running process on pm2 node to give it a command or string, or just to interact with it.
For example i have a backtest that always asks to choose an option of 2 different histories I have for the same pair and exchange, and after you start it, it asks me to choose a database... 
on screen or so i can just go there and till it to choose, but on PM2 ??? 

Would be nice to know how... 
thanks.