break和continue的用法

#!/bin/sh
while :
do
  echo -n "Enter number 1 to 5:"
  read NUM
    case $NUM in
     1|2|3|4|5)
         echo "OK you enter num $NUM" ;;
     *)
         echo -e "NO.continue(y|n):\c"
            read info
         case $info in
         y|Y)
          
            ;;
          n|N)
          
            ;;
          esac
       ;;
      esac
done