Shell脚本-无回声，无错误

Question

I'm not sure why i'm not getting any error or any echoed information from this script. It's one of those exercises where we are supposed to correct mistakes in the script. I just need a nudge to point me in the right direction.

#!/bin/bash
clear
echo 

while [ "$CHOICE" = "y" ]
do

    # Rocket ship count down code
    for num in {1..5}
    do
        echo "$num ..."
        sleep 1
    done

    echo
    echo -n 'We have main engine start.'

    # Rocket ship powering up
    for num in {1..3}
    do
        echo -n ". "
        sleep 1
    done
    # End rocket ship powering up loop

    echo -e '\e[1;31mlift off!\e[0m'
    echo

    # Loop to build rocket ship
    ################################################## Do not alter the code between these hash marks ###################################################
    for rocket_ship_part in  '\e[1;30m    A   \e[0m' '\e[1;30m   / \  \e[0m' '\e[1;30m   |=|  \e[1;30m' '\e[1;30m   |\e[1;31mU\e[0m\e[1;30m|' \
    '\e[1;30m   |\e[1;34mS\e[0m\e[1;30m|' '\e[1;30m   |\e[1;32mA\e[0m\e[1;30m|' '\e[1;30m  _|=|_  ' '\e[1;30m / | | \ ' '\e[1;30m | \|/ | ' \
    '\e[1;30m |/"\e[1;31m"\e[0m"\| ' '\e[1;31m   """ \e[0m' '\e[1;31m   """ \e[0m' '\e[1;31m    " \e[0m' '\e[1;31m    " \e[0m' '\e[1;31m    . \e[0m' \
    '\e[1;31m    . \e[0m' '\e[1;31m    . \e[0m' '\e[0;31m    . \e[0m' '\e[0;31m    . \e[0m' '\e[0;30m    . \e[0m' '\e[0;30m    . \e[0m'
    ################################################## Do not alter the code between these hash marks ###################################################
    do
        echo -e "$rocket_ship_part"
        sleep 1
    done

    # Up, up and away!
    for altitude in {1..30}
    do
        echo
        sleep 0.5
    done
    clear
    echo 'To the stars and beyond!'
    echo
    echo -n "Do ypu want to launch the rocket again? (y/n) "
    read CHOICE
    clear
done

Answer 1

$CHOICE永远不是y ，所以它永远不会进入while循环。