Many a times, when you are trying to unmount your usb device, you find it busy and can't figure out what process is keeping it busy. Some of the commands which can help you in this matter are "fuser" and "lsof". fuser displays the PID of processes using specified files or file systems. lsof list the open files. Just observe the output of my lsof command:
[Wed Jun 09|swg@insane:intel]$ lsof |grep Transcend
bash 8619 swg cwd DIR 8,17 4096 470 /media/Transcend/intel
lsof 13006 swg cwd DIR 8,17 4096 470 /media/Transcend/intel
grep 13007 swg cwd DIR 8,17 4096 470 /media/Transcend/intel
lsof 13008 swg cwd DIR 8,17 4096 470 /media/Transcend/intel
Transcend is my usb device which I want to unmount and it is giving me a 'device busy' error. I find that "current working directory" is accessing the this device apart from the other two commands about which I am aware of. Hence, I need to come out of this directory called "/media/Transcend/intel" and do an unmount on the usb device.
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