Linux: Find Out Open Files [ Descriptors ] Command

To find out the open files (also known as file descriptors) on a Linux system, you can use the lsof (List Open Files) command.

To list all open files on the system, you can use the following command:

lsof

This will display a list of all open files, along with the process ID (PID) of the process that has the file open, the type of file (e.g., regular file, directory, socket), and the file name.

You can also use the -p option to list the open files for a specific process. For example, to list the open files for the process with PID 1234, you can use the following command:

lsof -p 1234

You can also use the -u option to list the open files for a specific user. For example, to list the open files for the user john, you can use the following command:

lsof -u john