Basic Command	Description
psql -d database -U user -W	Connects to a database under a specific user
psql -h host -d database -U user -W	Connect to a database that resides on another host
psql -U user -h host “dbname=db sslmode=require”	Use SSL mode for the connection
\c dbname	Switch connection to a new database
\l	List available databases
\dt	List available tables
\d table_name	Describe a table such as a column, type, modifiers of columns, etc.
\dn	List all schemes of the currently connected database
\df	List available functions in the current database
\dv	List available views in the current database
\du	List all users and their assign roles
SELECT version();	Retrieve the current version of PostgreSQL server
\g	Execute the last command again
\s	Display command history
\s filename	Save the command history to a file
\i filename	Execute psql commands from a file
\?	Know all available psql commands
\h	Get help
\e	Edit command in your own editor
\a	Switch from aligned to non-aligned column output
\H	Switch the output to HTML format
\q	Exit psql shell

Start Stop and Status check

systemctl status postgresql-13.service

systemctl stop postgresql-13.service

systemctl start postgresql-13.service

PG Port Number 

select * from pg_settings where name=’port’;

Create Database

CREATE DATABASE name

[ [ WITH ] [ OWNER [=] db_owner ]

   [ TEMPLATE [=] template ]

   [ ENCODING [=] encoding ]

   [ TABLESPACE [=] tablespace ]

]