Cloud-9: How to open a file in the c9-editor from c9-terminal

Question

Is there a way to open a file not from the workspace tree view but from the c9-terminal tab?

Background: c9 doesn´t allow me to set the workspace path to / for a use

Answer 1

I've just written into /mnt/shared/plugins/google.cloud/etc/gitconfig. First I was not allowed to write it, in nano. But using "c9 open" - just closing the tab with .gitconfig saved my changes.