postgresql – running a .sql file via the ubuntu command line for postgres

I've installed postgresql on Ubuntu using:

$ sudo apt install postgresql

Now I have a series of SQL queries that I would like to run to create schemas, users, tables, and so on. I've put these queries in a .sql file as below:

$ sudo nano postgressetup.sql
CREATE SCHEMA schma;
CREATE USER a2i WITH PASSWORD & # 39; password & # 39 ;;
GRANT CONNECT ON DATABASE postgres TO schma;

This file contains all queries. I have tried something like:

$ psql -U postgres -d postgres -a -f postgressetup.sql

and received an error:

psql: FATAL: Peer authentication failed for the user "postgres"

I want to know how to run this .sql file.
Note: I just installed Postgres and no other operation is performed on it. Any help is appreciated.