How to add role to the PostgreSQL

If you need have superuser access to PostgreSQL via command line psql utility, create needed username first:

sudo -u postgres createuser NEEDED_USERNAME

You will be asked whether role should be a superuser:

Shall the new role be a superuser? (y/n)

answer Y (yes) if so and hit Enter.
Now you have NEEDED_USERNAME allowed to access databases as a superuser via psql.

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