Unknown Command - Returns "Unknown Command" messages. And lets you edit what ops can do.
For a while now CraftBukkit had an "Unknown Command" message. As of UC 1.2, this plugin now instead allows for custom UC messages to be sent to the player. All you have to do is run the plugin once, and edit the file at /plugins/Unknown Command/Messages.txt. You can have more than one message (separated by lines) and it will randomly choose which one to say to the player. It supports all of the Minecraft color codes. Instead of the usual & you need to put a \. So if you wanted a blue message you would put \1Unknown Command. To edit what ops can do go to /plugins/Unknown Command/Commands.txt. Any thing you remove will be a Unknown Command.
Downloads
Click download in the top right corner of the screen
How To Install
Place Unknown Command in to you plugins directory
Reload or restart your server
Edit the files to your liking
Commands
/uc reload - Reloads the plugins configuration