Please ask the following shell script flow:
1. Why use $ * instead of $1 in a function?
2. how does while true jump out of the function?
3. The first two returns of case return the function return value?
4. Please explain the process of execution and do not understand it. . .

10 yes_or_no(){
 11     echo "Is your name $*"
 12     while true
 13     do
 14         echo  "Enter yes or no"
 15         read x
 16         case $x in
 17             y | yes)    return 0;  ;
 18             n | no )    return 1;  ;
 19             *      )    echo "Enter yes or no"
 20         esac
 21     done
 22 }
 23
 24 echo "Original parameters are $*"
 25 if yes_or_no "$1"
 26 then
 27     echo "Hi $1, nice name"
 28 else
 29     echo "Never mind"
 30 fi
 31 exit 0