Add comment using CLI

Hi Everyone,
2 Questions on RT command line tools. Using version 3.6.3 here.

  1. I’ve used “rt-crontool” to add comments to tickets based on a scheduled
    query and like that functionality.
    Is there a way to add comments to tickets on the fly using the "rt"
    CLI interface?
    I’ve looked at the help and examples and did not see anything obvious.
  2. I know the “rt” CLI interface can make use of environment variables like
    Can the rt-crontool use these as well? It seems to only utilize the
    credentials of the logged on user and ignores the environment settings.

Thanks in advance!