A.P. Lawrence

This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open Desktop or Openserver.

There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.

TCP/IP and NFS FAQ

How can I tell what process has a network port in use?

For example, if you wanted to know what process is using port 139, you'd do:

 lsof -i :139

The lsof tool is not just for network connections. It shows you detailed information about open files in general- not just network activity.

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