nmap 检测扫描端口，shell elif then else 用法

#!/bin/bash
#yum install -y nmap                    # 安装扫描工具
read -p "请输入域名或IP地址进行检测：" eaddress
read -p "请选择执行方式：1 为端口范围，2 为指定端口，由数组 eport 控制" ecase
startp=60000                                    # 端口开始扫描范围
endp=60100                                      # 结束范围
eport=(
80 443 6379 3389 22
)
fanwei (){
  for((i=$startp;i<=$endp;i++))
    do
      statusP=$(nmap -p $i $eaddress -Pn | grep $i | awk -F" " '{print $2}'| sed 's/ //g' ) ; echo "$eaddress $i ----- ${statusP}"
      if [[ $statusP = "open" ]]; then
           echo "端口---------> $i 通畅"
      elif [[  $statusP = "closed" ]]; then
           echo "端口： $i 开放，没有服务运行该端口"
      else
           echo "端口没开放"
      fi
    done
}
zhiding(){
for i in ${eport[*]}
  do
       statusP=$(nmap -p $i $eaddress -Pn | grep $i | awk -F" " '{print $2}'| sed 's/ //g' ) ; echo "$eaddress $i ----- ${statusP}"
       if [[ $statusP = "open" ]]; then
           echo "端口---------> $i 通畅"
      elif [[  $statusP = "closed" ]]; then
           echo "端口： $i 开放，没有服务运行该端口"
      else
           echo "端口没开放"
      fi
    done
}
  case $ecase in
       "1") echo "您选择了使用端口范围方式扫描"
               fanwei
;;
        "2")echo "指定端口扫描"
              zhiding
;;
        *)echo "选择无效，请重新输入！"
              exit
;;
esac

# wget eisc.cn/file/shell/nmap.sh ; sh nmap.sh
# 执行脚本