How do I determine what is using the folder?

Question

I just can't delete the folder under root (it says that resource/device is busy), but lsof and fuser tell me nothing. The folder is located in the depth of /var/www/... and I tried to delete it after I stop apache2 and nginx.

Answer 1

You can use:

sudo lsof +D /var/www/dir_name

Once you know which processes have files open, you can exit those apps, or kill them with the kill command.

If you had a partition mounted to that point, you should umount first.