bash 쉘스크립트 질문입니다.

#!/bin/bash
 
echo -n "P = 프로세스 리스트, K = 프로세스 강제종료, Q or X = 동작스크립트 종료:, C = 화면초기화"
read answer
 
case $answer in
        p|P)
                echo "answer is p";
ps -e
;;
 
        k|K)
                echo "answer is k";
read answer
answer "ID;"
 
kill -9 pid
;;
        q|Q)
                echo "answer is q";
exit
;;
 
        x|X)
                echo "answer is x";
exit
;;
 
        c|C)
                echo "answer is c";
clear
;;
 
 
*)
echo "answer isn't p or k or q or x"
esac