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两种方法，另附效果图：

第一种方案:

while true; do 
 
 
read -p "Do you wish to install this program?" yn 
 
 
case $yn in 
 
 
[Yy]* ) make install; break;; 
 
 
[Nn]* ) exit;; 
 
 
* ) echo "Please answer yes or no.";;
    esac
done
 
 
第二种方案:
 
 
echo "Do you wish to install this program?" 
 
 
select yn in "Yes" "No"; do 
 
 
   case $yn in 
 
 
Yes ) make install; break;; 
 
 
No ) exit;; 
 
 
esac 
 
 
done