TCP/IP and NFS FAQ
By using lsof (included with Linux, available from http://www.sco.com/skunkware for old SCO).
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.
See lsof also.
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