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How do you determine if a port is in use?

By nhilty ·
I have run across multiple ways to check and see if a port is in use and the quickest and easist way is to run a the following netstat command. For example: if you wanted to see if port 9800 was currently in use, you would enter

netstat -an | grep 9800

Returns the following if port 9800 is already in use, in this case, an application is already listening on port 9800:
$ netstat -an | grep 9800
*.9800 *.* 0 0 4**52 0 LISTEN

If the port was not in use, the following would get returned:
netstat -an | grep 9801

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