What arguments should I put to make Visual Studio Code default script editor?

I work in ubuntu 16.04 LTS and I have Unity 2017.2.1f1. I want to make VSC my defaul script editor , so I put the shortcut of VSC , but I have to put an argument (e.g. : “$(File)”). I copy-pasted the location of the VSC, but when I want to open a script (TriggerChecker.cs), VSC opens but the script doesn’t appear…
There appears the welcome page.
Can you help me with this error?
Thanks,
Matthew
P.S: There’s a video that is attached below.

https://drive.google.com/open?id=1M_IOdDS0GxMIzvY5r3Klp_y__5bjLlG2

Go to the External Tools section.