Umount:/mnt/CDROM: device is busy

Umount:/mnt/CDROM: device is busyevery wonder why sometimes you get this message

When you try to un-mount a NFS drive or CDROM Drive

Coderoot @ Homer:~ # Umount/mnt/CDROM

Umount:/mnt/CDROM: device is busy
Umount:/mnt/CDROM: device is busy
Root @ Homer:~ #

Well chances a process is running that is using that directory. To find out run

Coderoot @ Homer:~ # Fuser-M/mnt/CDROM/
/Mnt/CDROM/: 24066c

That shows you what process is using that directory. Now lets do a PS aux and see

Whats running

Coderoot @ Homer:~ # Ps aux | grep 24066

Root 24066 0.0 0.5 2244 1284 pts/10 s-su
Root @ Homer:~ #

Looks like a root user is in that directory. If you cannot find the term that is

In that directory then kill that process

Coderoot @ Homer:~ # Kill-9 24066
Root @ Homer:~ #

Now you can un-mount

Coderoot @ Homer:~ # Umount/mnt/CDROM/
Root @ Homer:~ #

This tip brought to you by the letter J and the letter y