How to list all open files on the system
List all open files: This command lists out all the files that are opened by any process in the system.
lsof
Here, you observe there are details of files which are opened. Process Id, the user associated with the process, FD(file descriptor), size of the file all together gives detailed information about the file opened by the command, process ID, user, its size etc.
- FD represents as File descriptor.
- cwd : Current working directory.
- txt : Text file.
- mem : Memory file.
- mmap : Memory mapped device.
How to List Open Files in Linux | lsof Command
In the world of Linux, understanding and managing open files is crucial for system administrators and users alike. The Linux operating system provides a powerful utility called lsof
(List Open Files) that allows users to gain insights into the files currently open on their system. In this article, we will delve into the intricacies of the lsof
command, exploring its syntax, options, and practical use cases.
Linux/Unix consider everything as file and maintains folder. So “Files or a File” is very important in Linux/Unix. While working in Linux/Unix system there might be several file and folder which are being used, some of them would be visible and some not.
Table of Content
- Understanding Isof (List Open Files)
- Syntax of List Open Files `lsof`
- Options Available in lsof Command
- Pratical Example of How to List Open File in Linux
- 1. How to list all open files on the system
- 2. How to show file opened by a particular user
- 3. How to List all files which are opened by everyone except a specific user
- 4. How to list all open files by a particular process
- 5. How to List all open files that are opened by a particular process ID
- 6. Files opened by all other PID
- 7. How to List parent process IDs
- 8. How to list all opened files opened by a directory
- 9. How to open Files by network connections