-is normally called from a udev rule, to provide udev a unique hardware path for
-a device. Udev can use this information to create symlinks in /dev/ to the real
-device node.
-.SH EXAMPLES
-For all block devices on a system:
-
-.nf
-for i in `find /sys/class/block`
-do
- DEVPATH="`echo $i | sed -e 's@^/sys\|/dev@@g'`"; path_id
-done
-.fi
+is normally called from a udev rule, to create a unique name, based on
+the device properties along the chain of parent devices. Udev uses this
+information to create a persistent symlink to the real device node.