Today I will shortly describe how you can remotely check the PostgreSQL version and use it inside shell scripts. This ability comes in handy at times, as it can be used to perform different tasks depending on the returned database version.
There are two ways to non interactively provide a password for the psql command (PostgreSQL interactive terminal). Each method allows you to quickly write shell scripts using terminal-based PostgreSQL utilities as you can provide user credentials from the password file or environment variables.