Reset PostgreSQL master password ubuntu bash

I recently lost my admin password of ubuntu postgresql, this is how I did a reset to access my postgresql again

Step 1 : Run following command change the authentication method in the configuration file and then reload

    

sudo sed -ibak 's/^\([^#]*\)md5/\1trust/g' pg_hba.conf
/etc/init.d/postgresql reload

Step 2 : Once the authentication method is reset then you can login to postgres using following and set the new password value

psql -U postgres
postgres=# alter user postgres with password 'NEW_PASSWORD';
postgresl=# \q

Step 3 : Once the new password is set, change the authentication method back to md5

sudo sed -i 's/^\([^#]*\)trust/\1md5/g' pg_hba.conf
sudo -u postgres pg_ctl reload or /etc/init.d/postgresql reload

You are all set to login using your new password