Bash菜单-从SubMenu返回主菜单？

#!/bin/bash

while true; do
    clear
    echo "主菜单"
    echo "1. 执行操作1"
    echo "2. 进入子菜单"
    echo "3. 退出"

    read -p "请输入选项：" choice

    case $choice in
        1)
            echo "执行操作1"
            # 执行操作1的代码
            ;;
        2)
            while true; do
                clear
                echo "子菜单"
                echo "1. 执行子菜单操作1"
                echo "2. 返回主菜单"

                read -p "请输入选项：" sub_choice

                case $sub_choice in
                    1)
                        echo "执行子菜单操作1"
                        # 执行子菜单操作1的代码
                        ;;
                    2)
                        break  # 返回主菜单
                        ;;
                    *)
                        echo "无效的选项，请重新输入"
                        ;;
                esac
            done
            ;;
        3)
            exit 0  # 退出程序
            ;;
        *)
            echo "无效的选项，请重新输入"
            ;;
    esac
done