shell笔记之case语句

​一般用于固定传参脚本​

语法格式

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

使用case打印菜单

[root@zabbix_ser scripts]# cat zy07.sh
 #!/bin/bash
 #################################################
 #    File Name: zy07.sh
 #       Author: fakehydra
 #         Mail: [e-mail]
 #     Function: 
 # Created Time: 2018年11月05日 星期一 08时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 欢迎再次光临 \E[0m"
      exit 3
      ;;
    *)
        usage
      exit 1
  esac
 }
 main() {
 menu
 chose
 }
 while true
 do
 main
 done