Which Linux process is using a particular network port?

Seeing the 'address in use' error or need to find out which process is listening to a particular port on Linux? Here are the tools to find out!


Most network related services have to open up a network socket, so they can start listening for incoming network requests. It is common to find the TCP or UDP being used as the main communication protocol. In this article, we will check what ports are used by which Linux process. Auditing processes and network services Find out what process is listening to a port Only one process can actively listen to a TCP or UDP port.

Strace cheat sheet

The strace utility is diverse and helpful in performance tuning, troubleshooting, and monitoring process activity. Get the most out of this powerful tool!


Troubleshoot and monitor all processes

Monitor file access by Linux processes

Linux is powerful with the help of small utilities like lsof and strace. They help with monitoring disk and file activity, of new and running processes.


Processes are the running workforce on a Linux system. Each process has a particular goal, like forking child processes, handling incoming user requests of monitoring other processes. As a system administrator or IT auditor, you might want to know at some point what disk activity occurs in a process. In this article, we have a look at a few options to quickly reveal what is occuring in a process, including disk and file activity.