A easy to use PluginHider plugin.
Default blocked commands:
- /plugins
- /pl
- /help
- /?
- /bukkit: plugins
- /bukkit:help
- /bukkit:?
- /version
- /ver
You can easily add more if you wish!
How do I set a custom message when anyone tries running any of the blocked commands?
Open config.yml
go to line 11-12
custom-message: "&cNot today bud!"
custom-message-enabled: false

Enable the custom message and put your own message.