> umount /mnt/imsi
umount: /mnt/imsi: device is busy
==>
> fuser -cu /mnt/imsi/ #check users holding this directory
> fuser -ck /mnt/imsi #remove users holding this directory forcely
(주의, fuser 하면 로그인되어 있는 유저들이 로그아웃됨)
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