PostgreSQL: wipe all databases and start with a clean slate

Scenario: I munged the 'postgres' database, or I DROPped the 'template1' database, or I did some other similar stupidity. I don't have any important data in my PostgreSQL setup, so I would just like to wipe all the databases and start afresh.

Procedure:

1. As root, shut down the PostgreSQL server.
   

   # systemctl stop postgresql.service
   

2. Become the postgres user.
   

   # su - postgres
   

3. Copy the pg_hba.conf file to postgres home directory so I can restore it later.
   

   postgres$ cp data/pg_hba.conf .
   

4. Wipe the /var/lib/pgsql/data/ directory.
   

   postgres$ rm -rf /var/lib/pgsql/data/
   

5. Become root again.
   

   postgres$ exit
   

6. Start the server again - it will detect that the /var/lib/pgsql/data/ directory is missing and re-create it.
   

   # systemctl start postgresql.service
   

7. Become the postgres user.
   

   # su - postgres
   

8. Resore the pg_hba.conf file to data/
   

   postgres$ cp pg_hba.conf data/
   

9. Become root again.
   

   postgres$ exit
   

10. Restart the server to load the production pg_hba.conf settings.
    

    # systemctl restart postgresql.service