Lists information about files opened by processes (programs) on a un*x box.
Generally runnable by root.
An open file may be a regular file, a directory, a block special file, a character special file, an executing text reference, a library, a stream or a network file (Internet socket, NFS file or UNIX domain socket.) A specific file or all the files in a file system may be selected by path.
In a nutshell, use it to...
It will probably work with your flavor of un*x, very helpful command line tool for day to day work..