一般用於固定傳參指令碼

語法格式

 case 變數 in 
 1)
 do
 ;;
 2)
 do
 ;;
 *)
 exit
 esac

使用case列印選單

 [[email protected]_ser scripts]# cat zy07.sh
 #!/bin/bash
 #################################################
 #    File Name: zy07.sh
 #       Author: fakehydra
 #         Mail: [email protected]
 #     Function: 
 # Created Time: 2018年11月05日 星期一 08時47分17秒
 #################################################
 red='\E[1;31m'
 green='\E[1;32m'
 yellow='\E[1;33m'
 cherry='\E[1;35m'
 res='\E[0m'
 usage (){
 echo "$USAGE: {1|2|3|4}"
 exit 2
 }
 menu (){
 	cat << EOF
 	-------------------
 	1.apple
 	2.pear
 	3.banana
 	4.cherry
 	5.exit
 	-------------------
 EOF
 }
 chose (){
 	read -p "pls tell me what you want: " f
 	case $f in
 		1)
 			echo -e "$red this is apple $res"
 			;;
 		2)
 			echo -e "$green this is pear $res"
 			;;
 		3)
 			echo -e "$yellow this is banana $res"
 			;;
 		4)
 			echo -e "$cherry this is cherry $res"
 			;;
 		5)
 			echo -e "\E[1;5;31m 歡迎再次光臨 \E[0m"
 			exit 3
 			;;
 		*)
 	    	usage
 			exit 1
 	esac
 }
 main() {
 menu
 chose
 }
 while true
 do
 main
 done