What methods can be used to view files that were opened by a process (Linux)?

In Linux, you can view files opened by a process using the following methods:

1. Through the directory /proc/[pid]/fd/ — contains symbolic links to files opened by the process with the specified pid.

ls -l /proc/1234/fd/

2. Using the lsof command (list open files):

lsof -p 1234

3. The fuser command shows processes using a file, but in the reverse direction.

These methods allow you to get a list of open files, including regular files, sockets, devices, etc.