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This is the third post in the article series about Unix and Linux utilities that you should know about. In this post I will take you through the useful lsof tool. If netcat was called the Swiss Army Knife of Network Connections, then I'd call lsof the Swiss Army Knife of Unix debugging.
Lsof follows Unix philosophy closely. It does just one task and it does it perfectly — it lists information about files opened by processes. An open file may be a regular file, a directory, a NFS file, a block special file, a character special file, a shared library, a regular pipe, a named pipe, a symbolic link, a socket stream, an Internet socket, a UNIX domain socket, and many others. Since almost everything in Unix is a file, you can imagine how incredibly useful lsof is!
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