transmit token via controller.token file

When I transmit token like : 
cozy-controller -u --auth <token>

If I do "ps -e u | grep cozy-controller", I can see token.

That's why, I change token transmission. 

Now, cozy-controller is called like : 
cozy-controller -u --auth
and it reads token in file '/etc/cozy/controller.token'