I am using Ubuntu.
I know by using
cd ~/ , I can go to home/ directory.
But if I want to go to the directory (I do not know the official name of this directory) which contains
opt/, ... sub-directories, what is the symbol used to refer to this directory? (And by the way what is the official name of this directory? root directory?)
Basically, I would like to
cd to that directory without using
cd .. but one symbol to refer to it, is there such a symbol for it (like
~ refers to home directory)?