1) ssh into server (or practice locally first)
2) start screen
$ screen
# press return to get back to terminal
3) run a command
$ echo 'running my big process here..'
4) detach from screen and let commands keep running
$ Ctrl+a d
5) disconnect from server
$ exit
1) re-connect by ssh
2) re-attach to screen
$ screen -r
3) exit the screens
$ exit