List Open Files
If you try to unmount a partition and get a message like this:
# umount /media/usbdisk/ umount: /media/usbdisk: device is busy
use the lsof command to find out what programs are using what files:
# lsof /media/usbdisk/ COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME bash 6925 root cwd DIR 8,17 4096 1 /media/usbdisk/ xmms 6979 root cwd DIR 8,17 4096 1 /media/usbdisk/
This shows that the programs bash and xmms are using the device. For an even clearer picture, use the device name rather than the mountpoint:
# lsof /dev/sdb1 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME bash 6925 root cwd DIR 8,17 4096 1 /media/usbdisk xmms 6979 root cwd DIR 8,17 4096 1 /media/usbdisk xmms 6979 root 8r REG 8,17 2713101 377 /media/usbdisk/a.mp3
You either can wait until those processes exit or terminate them manually.
Special Reports: DevOps
Have projects in development that need help? Have a great development operation in place that can ALWAYS be better? Regardless of where you are in your DevOps process, Linux Journal can help!
With deep focus on Collaborative Development, Continuous Testing and Release & Deployment, we offer here the DEFINITIVE DevOps for Dummies, a mobile Application Development Primer, advice & help from the experts, plus a host of other books, videos, podcasts and more. All free with a quick, one-time registration. Start browsing now...
- The Ubuntu Conspiracy
- Science on Android
- A First Look at IBM's New Linux Servers
- Vigilante Malware
- Disney's Linux Light Bulbs (Not a "Luxo Jr." Reboot)
- Vagrant Simplified
- Bluetooth Hacks
- System Status as SMS Text Messages
- Libreboot on an X60, Part I: the Setup
- October 2015 Issue of Linux Journal: Raspberry Pi