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user3772108
Asked: 2015-04-30 01:53:20 +0800 CST

Ports are used by programm execution

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How can I found out which ports a program is using on his execution?

I am using a Ubuntu 14.04 Server and the program "SMcli". But the program shows on every execution "Network errors were detected while connecting to storage system". But before we changed the location everything was working fine.

Now I need to know which ports this program is using. Then I can look which ports the target is listening.

viewports

2 Answers

  1. Best Answer

    Try to use netstat -tunap or netstat -tunlp before the program starts and after the program starts.

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  2. If your program is nc (for example), you can do:

    sudo netstat -tulpn | grep "nc" | grep -Po "(?<=:)[^ ]+(?=.*:)"

    or

    sudo netstat -tulpn | grep "nc" | tr -s ' ' | cut -d' ' -f4 | cut -d: -f2

    Here i have considered only IPv4 and assumed that you have only one instance of the service running. If you need to consider any one of the above, then you should look for the service by the name and then decide which one is desired:

    sudo netstat -tulpn | grep "nc"

    Replace nc with the service name you want to look for.

    Example:

    $ sudo netstat -tulpn | grep "nc" | tr -s ' ' | cut -d' ' -f4 | cut -d: -f2
4567
$ sudo netstat -tulpn | grep "nc" | grep -Po "(?<=:)[^ ]+(?=.*:)"
4567
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