Postgresql

What's the difference between sudo su - postgres and sudo -u postgres?

There is no benefit to using sudo su, it's an anachronistic habit from when people were used to using su. People started tacking sudo in front when Linux distros stopped setting a root password and made sudo the only way to access the root account. Rather than change their habits, they just used sudo su.

https://serverfault.com/questions/601140/whats-the-difference-between-sudo-su-postgres-and-sudo-u-postgres