So I already run geth. And I quit. I don't remember how I quit, maybe I typed with exit or ctrl+c.
Anyway, now I can see geth running when I type [ top ] command in console terminal of ubuntu 16.04 server.
Now how can I go to inside of geth console? Thanks.
[ geth console ] command just spit out errors says, Fatal: Error starting protocol stack: datadir already used by another process