Su Log In Problem
 

Hello friends.

I installed rapsbian, and I'm trying to get into the interface folder in command prompt. I type:
/etc/network/interfaces

And I get : permission denied.
So I try to go to superuser typing

$ su
password: raspberry (I tried everything)

and I always get the same answer: su: authentication failure

What am I doing wrong?

have you tried sudo bash?

Interfaces is a configuration file not a directory.

sudo nano interfaces