Set Up Minecraft Series 4: WorldEdit and Permissions Additions
If no commands work, it may because WorldEdit failed to start: Make sure that you are running Bukkit/Forge/Sponge/etc. A vanilla minecraft server will not load plugins/mods! You can run a command such as version (Bukkit), sponge version (Sponge) or forge help (Forge) to ensure your server is running proper software.