Where to set CI_ENV for CI methods executed via cron?

This is how I do it:

public/index.php...

Calling it:

PHP Code:

php public/index.php controller method production 


Thank you for your response!

This does in fact address the problem but is not ideal for two reasons:
1) one must specify the environment every single time one specifies a cron/cli command. My crontab is going to have a dozen commands in it, all of which would need to have this value specified.
2) edits to the index.php file can make upgrading CodeIgniter more difficult because you have to propagate these changes manually merge these changes with any made by the CI core.

Is there not one place we can specify this value that works for both cron jobs and for cli execution?