Hello World

umount  linux filesystem 出現 target is busy 訊息
root@lab01:# umount /mnt/usb
umount: /mnt/usb: target is busy.

使用 fuser 檢查,是哪個processes 占用
root@lab01:# fuser -m /mnt/usb
-bash: fuser: command not found

如果找不到 fuser , 則安裝 psmisc 套件
root@lab01:# apt install psmisc

查詢占用程式
root@lab01:# fuser -m /mnt/usb
/mnt/usb:            151982c

root@lab01:# ps uax grep 151982
user1  151982  0.0  0.1   8164  5032 pts/1    Ss   May14   0:00 -bash

中止 processes
root@lab01:# kill  151982

如果沒有辦法中止,加上 -9 參數
root@lab01:# kill -9 151982