Informing inputs through arguments or flags allows the user to automate workflows. It is particularly useful when you're manipulating other tools within a script, as you can automate operations without having to interact with the terminal.
Basically, there are two ways to inform input parameters directly on the command lines:
Through the STDIN flag . (will be deprecated in early 2021)
Through Input flags.
You can check out more about each one on the following pages: