postgres user create password 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: set username and password for postgresql database

sudo -u postgres psql -c "ALTER USER postgres PASSWORD 'postgres';"

Example 3: create user and password postgres

dropuser username