telnet批量ip端口测试连通自动脚本

测试前将要测试的ip与端口分别创建在同目录iplist.txt和portlist.txt中，然后直接执行脚本即可。

function telnetport ()
{
    for ip in $(cat iplist.txt)
    do
        echo $ip
        for port in $(cat portlist.txt)
        do      
        		echo "" |telnet $ip $port > back_ruselt.txt 2>&1
                if [ `cat back_ruselt.txt |grep refused |wc -l` -ne 0 ];then
                	echo "$ip:$port is refused" >> telnet.log	
                fi
        done
    done
}
telnetport
exit 0