Check Remote TCP Port Status with Shell Script - Easy Tutorial

If you're looking to check the status of a remote TCP port using a shell script, you're in the right place. This process can be done easily with a few lines of code. Here's a tutorial on how to do it.

First, you'll need to use the "nc" command, which stands for "netcat". This command allows you to open connections to remote machines and check their port status. Here's an example of how to use it:


#!/bin/bash
nc -zv example.com 80

In this example, we're checking the status of port 80 on the domain "example.com". The "-z" flag tells netcat to scan for open ports without sending any data, and the "-v" flag makes netcat more verbose, providing additional information about the connection.

If the port is open, you'll see a message like this:


Connection to example.com 80 port [tcp/http] succeeded!

If the port is closed, you'll see a message like this:


nc: connect to example.com port 80 (tcp) failed: Connection refused

You can use this code in a shell script to check the status of multiple ports on multiple machines. Simply replace "example.com" and "80" with the appropriate domain and port number.

In conclusion, checking the status of a remote TCP port using a shell script is a simple process that can be done using the "nc" command. With just a few lines of code, you can easily check the status of multiple ports on multiple machines.

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