Q. How can I determine the files that a process has opened?
Q. How can I locate the process that is using a specific network address?
Q. How can I locate the processes that have files open on a file system?

A. Use lsof (LiSt Open Files).

From: "Juan G. Ruiz Pinto" <jgruiz@cyber1.servtech.com>

Lsof is available via anonymous ftp from
<ftp://vic.cc.purdue.edu/pub/tools/unix/lsof/lsof.tar.Z>
(for the most current version). There are binary distributions in the
"binary" directory.

A prebuilt installp (smit) installable package is available from
<http://www-frec.bull.com/>. The installation scripts in this package
automatically creates a group "kmem" during the install
and uses "acledit" to allow the kmem group to read /dev/mem and /dev/kmem.
This configuration is recommended by Vic Abell <abe@purdue.edu>, the
author of lsof.

Some parts © 2009 Advameg, Inc.