Linux / UNIX List Open Files for Process

To list the open files for a process on a Linux or Unix system, you can use the lsof command.

For example, to list the open files for a process with the process ID (PID) 123, you can use the following command:

lsof -p 123

This will show a list of all the open files for the process with PID 123.

You can also use the lsof command to list the open files for a specific user or a specific program. For example, to list the open files for the user user1, you can use the following command:

lsof -u user1

To list the open files for the program program1, you can use the following command:

lsof -c program1

You can also use the /proc filesystem to list the open files for a process. The /proc filesystem is a virtual filesystem that provides information about the running processes on the system.

For example, to list the open files for a process with PID 123, you can use the following command:

ls -l /proc/123/fd

This will show a list of all the open files for the process with PID 123. The fd directory in the /proc filesystem contains a symbolic link for each open file descriptor for the process.

Note: To list the open files for all processes, you can use the lsof command without any options.

lsof