#!/bin/bash

ctrlc_count=0

function no_ctrlc()
{
        let ctrlc_count++
        echo
        if [[ $ctrlc_count == 1 ]]; then
                echo "Don\'t do that." 
        elif [[ $ctrlc_count == 2 ]]; then
                echo "if you\'re sure, do it once more." 
        else
                echo "Okay, bye."
                exit
        fi
}

# define the trap that reacts on ctrl-c
trap no_ctrlc SIGINT

# run the command on something that will be restarted after receiving SIGINT
# this fails if you do it on while sleep 10000
while true
do
        echo doing nothing for a long time
        sleep 10000
done