Answers for "psql with user"

postgres create user

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;

how to login using a particular user postrges

psql -d mydb -U myuser -W
psql -h myhost -d mydb -U myuser -W

psql create user

# https://www.postgresql.org/docs/8.0/sql-createuser.html
CREATE USER <username> WITH PASSWORD '<password>' VALID UNTIL '<date here>';

create postgres user

createuser --interactive