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VxJasonxV
Asked: 2009-11-05 17:34:20 +0800 CST

Testing whether or not a port is already bound

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I'm looking to bind to a port for SSH tunnelling via a simple shell script (likely: BASH), and I'd like a more ... "sane" manner of testing whether or not the port is already bound to another process, and I'd rather not like to grok (read: grep) the output of netstat.

Is there some command or utility that makes doing this sane? I either have terrible google-fu and a terrible vocabulary, or most people don't try to iterate over ports programmatically via a shell, but instead via a programming language.

networking

2 Answers

  1. Best Answer

    you could use lsof:

    -i i select by IPv[46] address: [46][proto][@host|addr][:svc_list|port_list]

    lsof -i [email protected]:80
    • 6

  2. Another option would be lsof. You can do something like:

    lsof -i tcp:<port> -s tcp:listen
    • 2