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How to create a TCP listener or open ports in unix os

You can create a port listener using Netcat .

yum install nc -y

root@rmohan:~# nc -l 5000
you can also check if port is open or not using netstat command .

root@vm-rmohan:~# netstat -tulpen | grep nc
tcp 0 0 0.0.0.0:5000 0.0.0.0:* LISTEN 0 710327 17533/nc
you can also check with nc :

Netcat Server listener :

nc -l localhost 5000
Netcat Client :

root@vm-rmohan:~# nc -v localhost 5000
Connection to localhost 5000 port [tcp/*] succeeded!

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