fuser

Ever tried to unmount a drive only to get hit with a mysterious “in use” message?
Even when you are sure you are not using it?

Yea, that was one of the early problems that made learning linux tough. Then I learned about the fuser command:
<br />
fuser -v /path/to/mount<br />


You will get back what process is still using that mountpoint, and who owns that process:
<br />
USER PID ACCESS COMMAND<br />
root 2117 ..C... /bin/bash<br />


As you can see, I accidentally left a terminal open. Oops.

Related Links

• fuser at linuxcommand.org
  
• Also this linuxjournal article.