If I do "sudo ls -l /proc/<pid>/fd | wc -l", I see that increase by 4 for every "udevadm trigger --sysname-match=sdb1 --action=change" that I do.
If I do "sudo ls -l /proc/<pid>/fd | wc -l", I see that increase by 4 for every "udevadm trigger --sysname- match=sdb1 --action=change" that I do.