scanPort.md

Scan Port

注：本shell使用了nc命令测试服务器端口，请确保本地已安装了相应的程序包。

#!/bin/bash

if [ $# -lt 1 ]; then
   echo "Usage: ./scan.sh <hostip> [<port>]"
else
   ping=`ping -c 1 $1`

   string=${ping#*received, }
   string=${string% packet loss*}

   if [ $string = '0%' ];then
       echo $1 is alive.
       if [ $# -eq 2 ]; then
         nc -nvv -z $1 $2 >/dev/null 2>&1
         if [ $? -gt 0 ]; then
            echo "$2 port is closed."
         else
            echo "$2 port is open."
         fi
       fi
   elif [ $string = '100%' ];then
       echo $1 is dead.
   else
       echo The network sucks!
   fi
fi