How do I tell from within a ruby script whether it has been run from the command line or from a non-interactive process? -

How can I tell from within a Ruby script, it has been run from the command line, that is how:

& gt; Ruby myscript.rb

Or from a non-interactive process, e.g. Cron?

$ stdin.tty? If the back terminal is otherwise wrong.

Additional information on the question is quite a bit