You're testing what happens when you delete a file for which an open file descriptor exists. On Linux, a shared library will normally be memory-mapped but will

You're testing what happens when you delete a file for which an open file descriptor exists. On Linux, a shared library will normally be memory-mapped but will not have a corresponding file descriptor. So lsof will show DEL, not (deleted). I wouldn't normally nitpick about something like this, but if people follow your advice they might incorrectly think they don't need to reboot.