循环两个菜单并根据提示显示输出

Question

当脚本启动时，它会从目录中的文件中列出一个菜单并提示选择，当选择一个文件时，会显示另一个菜单，其中包含用户想要执行的操作，现在用户想要使用选项 6 返回上一个菜单，该操作已成功完成，但当用户从主菜单中选择另一个选项时，脚本似乎没有更新：

#!/bin/bash


echo "Welcome to Led_Config"
echo "============================"

echo "Please select a led to configure"

echo "---------------------------------"

print_menu(){
i=({0..7})

for file in /sys/class/leds/* 
do 
    echo ${i[i++]}".""$(basename "$file")"

done

echo ${i[7]}".""Quit"
echo "------------------------------------"
printf "Please enter a number (1-8) for the led to configure or quit:"
read ans
clear
}
print_menu


while [ $ans != '' ]
do
    if [[ $ans = 5 ]]
    then 
    echo "LED0"
    echo "====="
    PS3="Please enter a number (1-6) for your choice:"
    options=("turn on" "turn off" "associate with a system event" \
        "associate with the performance of a process" \
        "stop association with a process performance" \
        "quit to main menu")
    select opt in "${options[@]}"
    do
    case $REPLY in 
        1) echo 1 | sudo tee /sys/class/leds/led0/brightness;;
        2) echo 0 | sudo tee /sys/class/leds/led0/brightness;;
        3) echo "Associate Led with a System Event";
            echo "============================";
            echo "Available Events are:";
            echo "---------------------";
            i=({0..34})
            for file in /sys/class/leds/led0/*
            do 
                echo ${i[i++]}".""$(basename "$file")"
            done;;
        6) print_menu;
    esac 
done    




elif [[ $ans = 6 ]]
then
    echo "LED1"
    echo "===="
     PS3="Please enter a number (1-6) for your choice:"
     options=("turn on" "turn off" "associate with a system event" \
                  "associate with the performance of a process" \
          "stop association with a process performance" \
                  "quit to main menu")
     select opt in "${options[@]}"
     do
     case $REPLY in 
                                                         1) echo 1 | sudo tee /sys/class/leds/led1/brightness;;      2) echo 0 | sudo tee /sys/class/leds/led1/brightness;;
         6) print_menu;;

             esac 
     done            
 fi


if [[ $ans = 7 ]]
then
    exit
else 

    echo "under construction"
    break
fi
done