```text
Usage: ./letsencrypt.sh [-h] [command [argument]] [parameter [argument]] [parameter [argument]] ...
-Default command: cron
+Default command: help
Commands:
- --cron (-c) Sign/renew non-existant/changed(TODO)/expiring certificates.
+ --cron (-c) Sign/renew non-existant/changed/expiring certificates.
--revoke (-r) path/to/cert.pem Revoke specified certificate
--help (-h) Show help text
--env (-e) Output configuration variables for use in other scripts