how to log in as the postgresql superuser code example

Example 1: create db user postgres

sudo -u postgres psql
postgres=# create database mydb;
postgres=# create user myuser with encrypted password 'mypass';
postgres=# grant all privileges on database mydb to myuser;

Example 2: postgres create user with superuser privileges

sudo -u postgres createuser -s -i -d -r -l -w <>
sudo -u postgres psql -c "ALTER ROLE <> WITH PASSWORD '<>';"