Originally Posted by six_storm
Interesting. I thought it was disabled unless I put you in the ops.txt but I guess I was wrong. I'll have to do some research on securing my server!
Nope. the ops.txt file is only for admin commands. You need to have world guard or something like that installed in order to block users from building. If you want to limit the players a whitelist would be a good method. Unless you're going to build some magical stuff I don't think griefing is going to be too much of an issue.
Do you have cron jobs setup for your server? There is a really nice set of scripts to do automated backups and run the server as a service so you don't need to be logged in for it to stay up.