Add host (allow adding tags/groups to hosts)
Delete host by IP, Host or both
Check for existing host by IP, host or both. (With proper exit codes!)
list by regex or by IP w/ subnet
Remove duplicates, sort alphabetically
Merge external hosts file over HTTPS (option to --replace also) (can schedule to run every day)
Backup hosts file to git or S3 etc.
Restore from old backup
Open hosts file in preferred editor
Cat out hosts file with nice highlighting/formatting
Self update hosts
Get/Set config values.
Spit out help for commands
More logging.
No logging.
Help per commands