求大神帮检查一下我写的Linux脚本程序。 我运行了一下是个无限循环，不在哪里有错误。

echo -e "Please enter your choice (A-Q) : "
read choice
while [ $choice != "Q" ] && [ $choice != "q" ]
do
if [ $choice = "A" ] || [ $choice = "a" ]
then
echo "A) Creat a user account"

elif [ $choice = "B" ] || [ $choice = "b" ]
then
echo "B) Delete a user account"

elif [ $choice = "C" ] || [ $choice = "c" ]
then
echo "C) Change supplementary group for a user account"

elif [ $choice = "D" ] || [ $choice = "d" ]
then
echo "D) Change initial group for a user account"

elif [ $choice = "E" ] || [ $choice = "e" ]
then
echo "E) Change defult login shell for a user account"

elif [ $choice = "F" ] || [ $choice = "f" ]
then
echo "F) Change account expiration date for a user account"

fi
read choice
done
echo "Q) Quit"