RT Cannot Connect to Local PostgreSQL Service with postgres User

[dessy53]

@LesAdams

sudo -u postgres psql postgres
psql (9.2.23)
Type "help" for help.

postgres=# \password postgres
Enter new password: 
Enter it again: 
postgres=# \q

1. Restart PostgreSQL: sudo service postgresql restart

1. trust connection by adding in pg_hba.conf file

• local all postgres trust

2. Restart postgresql service

• sudo service postgresql restart

3. psql -U postgres
4. At the postgres=# prompt, change the user name postgres password:

• ALTER USER postgres with password ‘new-password’;

5. Revert the changes in pg_hba.conf file from trust to md5 and restart postgresql
   yet when i try to test psql -U postgres -W
   it will give me this error:
   [root@localhost rt-4.4.3]# psql -U postgres -W
   Password for user postgres:
   psql: FATAL: Peer authentication failed for user “postgres”
   [root@localhost rt-4.4.3]#
   pls how can i go about this?