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It is possible with a simple Unix command to find out if we can listen on a port or not? I'm building an application in which the user has the permissions to change the port.

I have to check though if the port is already listening somewhere or not. I want it in Command since i can't use any programming language for other reasons.

Thanky you

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To check if a port is not already binding using :

$ nc -zw2 <IP> <PORT> && echo "already binding" || echo "Not already binding"

Reminder, users can only use ports > 1024 and < 65536

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