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![Linux and Unix Port Scanning With netcat [nc] Command - nixCraft](https://www.cyberciti.biz/media/new/faq/2007/07/scan-with-nc.jpg "Linux and Unix Port Scanning With netcat [nc] Command - nixCraft")
Linux and Unix Port Scanning With netcat [nc] Command - nixCraft
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How to check open ports in Linux - javatpoint
How to check if port is in use on Linux or Unix - nixCraft
5 Ways to Check if a Port Is Opened - wikiHow
