PostgreSQL (10.4 (Ubuntu 10.4-2.pgdg16.04+1)) Ubuntu 16.04.4 LTS

Installation

https://www.postgresql.org/download/linux/ubuntu/

Create the file /etc/apt/sources.list.d/pgdg.list and add a line for the repository

deb http://apt.postgresql.org/pub/repos/apt/ xenial-pgdg main

Import the repository signing key

wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -

and update the package lists

sudo apt-get update

apt-get install postgresql-10

###### INCLUDED IN DISTRIBUTION
###### postgresql-client-10,postgresql-10,postgresql-contrib-9.x,postgresql-xx,libpq-dev,
###### postgresql-server-dev-10,pgadmin4

Creating user

$ sudo -u postgres createuser <username>

Creating Database

$ sudo -u postgres createdb <dbname>

Giving the user a password

$ sudo -u postgres psql
psql=# alter user <username> with encrypted password '<password>';

Granting privileges on database

psql=# grant all privileges on database <dbname> to <username> ;

Commands

\list or \l: list all databases
\dt: list all tables in the current database You will never see tables in other databases, these tables aren't visible. You have to connect to the correct database to see its tables (and other objects).
\connect <database_name> # To switch databases:

How to manage PostgreSQL databases and users from the command line

https://www.a2hosting.in/kb/developer-corner/postgresql/managing-postgresql-databases-and-users-from-the-command-line

HELPFULL

create role <role_name> with createdb login;
create role <role_name> with createdb login password '<password>';
\password <role_name>
\du # list Role name and  List of roles Attributes

--Create User

CREATE USER my_user_test WITH LOGIN NOSUPERUSER NOCREATEDB  NOCREATEROLE    INHERIT NOREPLICATION   CONNECTION LIMIT -1 PASSWORD 'xxxxxxx';

-- Grant connect to my data base

GRANT CONNECT ON DATABASE my_db_test TO my_user_test;

-- Grant usage the schema

GRANT USAGE ON SCHEMA my_sch_test TO my_user_test ;

-- Grant all table for SELECT, INSERT, UPDATE, DELETE

GRANT SELECT, INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA my_sch_test TO my_user_test;

Use systemctl command to manage postgresql service:

systemctl stop postgresql #stop service

systemctl start postgresql #start service

systemctl status postgresql #show status of service:

systemctl disable postgresql # disable service(not auto-start any more)

enable service postgresql(auto-start)

systemctl enable postgresql

saivachandran/PostgreSQL-Ubuntu.md