I am a quite new modder. Just started... I am kinda stuck with creating a command. All the videos and sites I google myself to is to no help. I thought this was the only place I could get help from people that knows their stuff. I try to make a kinda useless command that just kill you. But again kinda stuck. Could you tell me what to do? Here is the lines of code from the ICommand: 

package com.crazylevi.crazymod;

import java.util.List;

import net.minecraft.command.CommandException;
import net.minecraft.command.ICommand;
import net.minecraft.command.ICommandSender;
import net.minecraft.util.BlockPos;

public class CrazyCommand implements ICommand {

    @Override
    public int compareTo(ICommand o) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public String getCommandName() {
        // TODO Auto-generated method stub
        return "crazy";
    }

    @Override
    public String getCommandUsage(ICommandSender sender) {
        // TODO Auto-generated method stub
        return "Wanna try it?";
    }

    @Override
    public List<String> getCommandAliases() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void processCommand(ICommandSender sender, String[] args) throws CommandException {
        // TODO Auto-generated method stub

    }

    @Override
    public boolean canCommandSenderUseCommand(ICommandSender sender) {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public List<String> addTabCompletionOptions(ICommandSender sender, String[] args, BlockPos pos) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public boolean isUsernameIndex(String[] args, int index) {
        // TODO Auto-generated method stub
        return false;
    }

}
 

Thank you for your time!

Don't implement ICommand yourself, extend CommandBase.