A Linux administrator needs to remove a USB drive from a system. The unmount command fails, stating the device is busy. Which of the following commands will show the reason for this error?
A) lsusb | grep /mnt/usb
B) mount | grep /mnt/usb
C) ps aux | grep /mnt/usb
D) lsof | grep /mnt/usb

Question

Quizplus · Accepted Answer

The `lsof` command lists open files and can show which processes are using files on the USB drive, causing it to be busy.

A Linux Administrator Needs to Remove a USB Drive from a System