#!/bin/bash

spin() {
    local i=0
    local sp="/-\|"
    local n=${#sp}
    printf " "
    sleep 0.2
    while true; do
        printf "\b%s" "${sp:i++%n:1}"
        sleep 0.2
    done
}

printf "Hacking NASA    "
spin &
spinpid=$!
trap 'kill $spinpid' SIGTERM SIGKILL
{
    # You can run all the command you want here. I will run only sleep command.
    sleep 5
} &>/dev/null
kill $spinpid
printf "\b \t[done]\n"
printf "NASA has been successfully hacked!!!\n"

exit 0