### to prevent accidental shudown, add confirm dialog to commands:
confirm() {
    # call with a prompt string or use a default
    read -r -p "${1:-Are you sure? [y/N]} " response
    case "$response" in
        [yY][eE][sS]|[yY]) 
            true
            ;;
        *)
            false
            ;;
    esac
}
alias reboot="confirm && reboot"
alias shutdown="confirm && shutdown"
alias poweroff="confirm && poweroff"