shell case in 返回问题

下面脚本里第三选择想实现返回 echo "选择yes/no" ，用了while true;do ,retrun 0 虽然能实现功能，但是一直报错 return: can only `return' from a function or sourced script, help!!!

#!/bin/bash

echo "选择yes/no"
read chooise
case $chooise in
yes)
    echo "1111"
;;
no)
    exit 0
;;
*)
    echo "重新选择"
;;
esac

---

我不是特别清楚，我写了一个或许可以使用，还有完善的地方。

#!/bin/bash

echo "选择yes/no"
flag=1
ret=0
#read chooise
while [ $flag -eq 1 ]; do
read chooise
case $chooise in
    yes)
        echo "1111"
        let ret=1
        let flag=0
        ;;
    no)
        #exit 0
        let ret=0
        let flag=0
        ;;
    *)
        echo "重新选择"
        ;;
esac
done
echo $flag
echo $ret

---

还是搞定了.

#!/bin/bash
while true
do
echo "选择yes/no"
read chooise
case $chooise in
yes)
    echo "1111"
    exit
;;
no)
    exit 
;;
*)
    echo "重新选择"
;;
esac
done