Username and password for postgresql?

Question

I have installed postgresql in ubuntu.

But i need to know the username and password for it?

If i have to set it, how do i do that?

Thanks!

Answer 1

Did you check the Ubuntu-manual?

Answer 2

You do not need to know postgresql's password.Because by default,postgresql trust local os users.So you can login postgresql without password:

psql -d db -U postgres

then you can change you password:

alter user postgres password 'password'