Linux - How to find a port is open or not, Determine tcp port is open or close

How to find a port is open or not

nmap command can be used to find the tcp port 80 is open or closed. To find whether the port is open or close use the namp command with the following options.

   nmap -p 80 hostname

Example:

   nmap -p 80 localhost

For UDP

   nmap -sU -p 80 hostname

The above command will determine the port 80 is opened or closed.

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