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zero-mk
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[#]: collector: (lujun9972)
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[#]: translator: (zero-MK)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (How To Check If A Port Is Open On Multiple Remote Linux System Using Shell Script With nc Command?)
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[#]: via: (https://www.2daygeek.com/check-a-open-port-on-multiple-remote-linux-server-using-nc-command/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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How To Check If A Port Is Open On Multiple Remote Linux System Using Shell Script With nc Command?
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======
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We had recently written an article to check if a port is open on the remote Linux server. It will help you to check for single server.
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If you want to check for five servers then no issues, you can use any of the one following command such as nc (netcat), nmap and telnet.
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If you would like to check for 50+ servers then what will be the solution?
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It’s not easy to check all servers, if you do the same then there is no point and you will be wasting a lots of time unnecessarily.
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To overcome this situation, i had coded a small shell script using nc command that will allow us to scan any number of servers with given port.
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If you are looking for a single server scan then you have multiple options, to know more about it. Simply navigate to the following URL to **[Check Whether A Port Is Open On The Remote Linux System?][1]**
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There are two scripts available in this tutorial and both the scripts are useful.
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Both scripts are used for different purpose, which you can easily understand by reading a head line.
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I will ask you few questions before you are reading this article, just answer yourself if you know or you can get it by reading this article.
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How to check, if a port is open on the remote Linux server?
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How to check, if a port is open on the multiple remote Linux server?
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How to check, if multiple ports are open on the multiple remote Linux server?
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### What Is nc (netcat) Command?
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nc stands for netcat. Netcat is a simple Unix utility which reads and writes data across network connections, using TCP or UDP protocol.
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It is designed to be a reliable “back-end” tool that can be used directly or easily driven by other programs and scripts.
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At the same time, it is a feature-rich network debugging and exploration tool, since it can create almost any kind of connection you would need and has several interesting built-in capabilities.
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Netcat has three main modes of functionality. These are the connect mode, the listen mode, and the tunnel mode.
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**Common Syntax for nc (netcat):**
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```
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$ nc [-options] [HostName or IP] [PortNumber]
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```
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### How To Check If A Port Is Open On Multiple Remote Linux Server?
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Use the following shell script if you would like to check the given port is open on multiple remote Linux servers or not.
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In my case, we are going to check whether the port 22 is open in the following remote servers or not? Make sure you have to update your servers list in the file instead of us.
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Make sure you have to update the servers list into `server-list.txt file`. Each server should be in separate line.
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```
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# cat server-list.txt
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192.168.1.2
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192.168.1.3
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192.168.1.4
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192.168.1.5
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192.168.1.6
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192.168.1.7
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```
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Use the following script to achieve this.
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```
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# vi port_scan.sh
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#!/bin/sh
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for server in `more server-list.txt`
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do
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#echo $i
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nc -zvw3 $server 22
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done
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```
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Set an executable permission to `port_scan.sh` file.
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```
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$ chmod +x port_scan.sh
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```
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Finally run the script to achieve this.
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```
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# sh port_scan.sh
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Connection to 192.168.1.2 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.3 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.4 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.5 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.6 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.7 22 port [tcp/ssh] succeeded!
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```
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### How To Check If Multiple Ports Are Open On Multiple Remote Linux Server?
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Use the following script if you want to check the multiple ports in multiple servers.
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In my case, we are going to check whether the port 22 and 80 is open or not in the given servers. Make sure you have to replace your required ports and servers name instead of us.
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Make sure you have to update the port lists into `port-list.txt` file. Each port should be in a separate line.
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```
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# cat port-list.txt
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22
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80
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```
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Make sure you have to update the servers list into `server-list.txt` file. Each server should be in separate line.
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```
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# cat server-list.txt
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192.168.1.2
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192.168.1.3
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192.168.1.4
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192.168.1.5
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192.168.1.6
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192.168.1.7
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```
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Use the following script to achieve this.
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```
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# vi multiple_port_scan.sh
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#!/bin/sh
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for server in `more server-list.txt`
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do
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for port in `more port-list.txt`
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do
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#echo $server
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nc -zvw3 $server $port
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echo ""
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done
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done
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```
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Set an executable permission to `multiple_port_scan.sh` file.
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```
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$ chmod +x multiple_port_scan.sh
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```
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Finally run the script to achieve this.
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```
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# sh multiple_port_scan.sh
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Connection to 192.168.1.2 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.2 80 port [tcp/http] succeeded!
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Connection to 192.168.1.3 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.3 80 port [tcp/http] succeeded!
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Connection to 192.168.1.4 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.4 80 port [tcp/http] succeeded!
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Connection to 192.168.1.5 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.5 80 port [tcp/http] succeeded!
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Connection to 192.168.1.6 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.6 80 port [tcp/http] succeeded!
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Connection to 192.168.1.7 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.7 80 port [tcp/http] succeeded!
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/check-a-open-port-on-multiple-remote-linux-server-using-nc-command/
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作者：[Magesh Maruthamuthu][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: https://www.2daygeek.com/how-to-check-whether-a-port-is-open-on-the-remote-linux-system-server/
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@ -0,0 +1,189 @@
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[#]: collector: "lujun9972"
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[#]: translator: "zero-MK"
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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[#]: subject: "How To Check If A Port Is Open On Multiple Remote Linux System Using Shell Script With nc Command?"
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[#]: via: "https://www.2daygeek.com/check-a-open-port-on-multiple-remote-linux-server-using-nc-command/"
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[#]: author: "Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/"
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# 如何使用带有 nc 命令的 Shell 脚本来检查多个远程 Linux 系统是否打开了指定端口？
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我们最近写了一篇文章关于如何检查远程 Linux 服务器是否打开指定端口。它能帮助您检查单个服务器。
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如果要检查五个服务器有没有问题，可以使用以下任何一个命令，如 nc（netcat），nmap 和 telnet。
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但是如果想检查 50 多台服务器，那么你的解决方案是什么？
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要检查所有服务器并不容易，如果你一个一个这样做，完全没有必要，因为这样你将会浪费大量的时间。
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为了解决这种情况，我使用 nc 命令编写了一个 shell 小脚本，它将允许我们扫描任意数量服务器给定的端口。
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如果您要查找单个服务器扫描，您有多个选择，你只需导航到到 **[检查远程 Linux 系统上的端口是否打开？][1]** 了解更多信息。
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本教程中提供了两个脚本，这两个脚本都很有用。
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这两个脚本都用于不同的目的，您可以通过阅读标题轻松理解其用途。
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在你阅读这篇文章之前，我会问你几个问题，如果你知道答案或者你可以通过阅读这篇文章来获得答案。
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如何检查一个远程 Linux 服务器上指定的端口是否打开？
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如何检查多个远程 Linux 服务器上指定的端口是否打开？
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如何检查多个远程 Linux 服务器上是否打开了多个指定的端口？
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### 什么是nc（netcat）命令？
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nc 即 netcat 。Netcat 是一个简单实用的 Unix 程序，它使用 TCP 或 UDP 协议进行跨网络连接进行数据读取和写入。
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它被设计成一个可靠的 “后端” (back-end) 工具，我们可以直接使用或由其他程序和脚本轻松驱动它。
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同时，它也是一个功能丰富的网络调试和探索工具，因为它可以创建您需要的几乎任何类型的连接，并具有几个有趣的内置功能。
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Netcat 有三个主要的模式。分别是连接模式，监听模式和隧道模式。
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**nc（netcat）的通用语法：**
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```
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$ nc [-options] [HostName or IP] [PortNumber]
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```
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### 如何检查多个远程 Linux 服务器上的端口是否打开？
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|
如果要检查多个远程 Linux 服务器上给定端口是否打开，请使用以下 shell 脚本。
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|
在我的例子中，我们将检查端口 22 是否在以下远程服务器中打开，确保您已经更新文件中的服务器列表而不是还是使用我的服务器列表。
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|
您必须确保已经更新服务器列表 ： `server-list.txt file` 。每个服务器（IP）应该在单独的行中。
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```
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# cat server-list.txt
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192.168.1.2
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192.168.1.3
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192.168.1.4
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192.168.1.5
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192.168.1.6
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192.168.1.7
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```
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使用以下脚本可以达到此目的。
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```
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# vi port_scan.sh
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#!/bin/sh
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for server in `more server-list.txt`
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do
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#echo $i
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nc -zvw3 $server 22
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done
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```
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设置 `port_scan.sh` 文件的可执行权限。
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```
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$ chmod +x port_scan.sh
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```
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最后运行脚本来达到此目的。
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```
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# sh port_scan.sh
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Connection to 192.168.1.2 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.3 22 port [tcp/ssh] succeeded!
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|
Connection to 192.168.1.4 22 port [tcp/ssh] succeeded!
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|
Connection to 192.168.1.5 22 port [tcp/ssh] succeeded!
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|
Connection to 192.168.1.6 22 port [tcp/ssh] succeeded!
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Connection to 192.168.1.7 22 port [tcp/ssh] succeeded!
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|
```
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|
### 如何检查多个远程 Linux 服务器上是否打开多个端口？
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如果要检查多个服务器中的多个端口，请使用下面的脚本。
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在我的例子中，我们将检查给定服务器的 22 和 80 端口是否打开。确保您必须替换所需的端口和服务器名称而不使用是我的。
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|
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|
您必须确保已经将要检查的端口写入 `port-list.txt` 文件中。每个端口应该在一个单独的行中。
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```
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# cat port-list.txt
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22
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80
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|
```
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|
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|
您必须确保已经将要检查的服务器（ IP 地址 ）写入 `server-list.txt` 到文件中。每个服务器（ IP ） 应该在单独的行中。
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|
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|
```
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|
# cat server-list.txt
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192.168.1.2
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192.168.1.3
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192.168.1.4
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192.168.1.5
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192.168.1.6
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192.168.1.7
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```
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|
使用以下脚本来达成此目的。
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```
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# vi multiple_port_scan.sh
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#!/bin/sh
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for server in `more server-list.txt`
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do
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|
for port in `more port-list.txt`
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do
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#echo $server
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nc -zvw3 $server $port
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echo ""
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|
done
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done
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|
```
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|
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|
设置 `multiple_port_scan.sh` 文件的可执行权限。
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|
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|
```
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|
$ chmod +x multiple_port_scan.sh
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|
```
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|
最后运行脚本来实现这一目的。
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|
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||||||
|
```
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|
# sh multiple_port_scan.sh
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|
Connection to 192.168.1.2 22 port [tcp/ssh] succeeded!
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||||||
|
Connection to 192.168.1.2 80 port [tcp/http] succeeded!
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||||||
|
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||||||
|
Connection to 192.168.1.3 22 port [tcp/ssh] succeeded!
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||||||
|
Connection to 192.168.1.3 80 port [tcp/http] succeeded!
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||||||
|
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||||||
|
Connection to 192.168.1.4 22 port [tcp/ssh] succeeded!
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||||||
|
Connection to 192.168.1.4 80 port [tcp/http] succeeded!
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|
|
||||||
|
Connection to 192.168.1.5 22 port [tcp/ssh] succeeded!
|
||||||
|
Connection to 192.168.1.5 80 port [tcp/http] succeeded!
|
||||||
|
|
||||||
|
Connection to 192.168.1.6 22 port [tcp/ssh] succeeded!
|
||||||
|
Connection to 192.168.1.6 80 port [tcp/http] succeeded!
|
||||||
|
|
||||||
|
Connection to 192.168.1.7 22 port [tcp/ssh] succeeded!
|
||||||
|
Connection to 192.168.1.7 80 port [tcp/http] succeeded!
|
||||||
|
```
|
||||||
|
|
||||||
|
--------------------------------------------------------------------------------
|
||||||
|
|
||||||
|
via: https://www.2daygeek.com/check-a-open-port-on-multiple-remote-linux-server-using-nc-command/
|
||||||
|
|
||||||
|
作者：[Magesh Maruthamuthu][a]
|
||||||
|
选题：[lujun9972][b]
|
||||||
|
译者：[zero-MK](https://github.com/zero-mk)
|
||||||
|
校对：[校对者ID](https://github.com/校对者ID)
|
||||||
|
|
||||||
|
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||||
|
|
||||||
|
[a]: https://www.2daygeek.com/author/magesh/
|
||||||
|
[b]: https://github.com/lujun9972
|
||||||
|
[1]: https://www.2daygeek.com/how-to-check-whether-a-port-is-open-on-the-remote-linux-system-server/
|
||||||
Loading…
Reference in New Issue
Block a user