This is useful to find out which file is blocking a partition which has to be unmounted and gives a typical error of:
# umount /home/
umount: unmount of /home failed: Device busy
umount impossible because a file is locking home
Find opened files on a mount point with fuser or lsof:
# fuser -m /home # List processes accessing /home
# lsof /home/ctechz/
About an application:
# lsof -p 3324
About a single file:
# lsof /usr/local/src/firefox/firefox
FreeBSD and most Unixes
# fstat -f /home # for a mount point
# fstat -p PID # for an application with PID
# fstat -u user # for a user name
To list all the open files on the var filesystem:
# lsof +D /var
To list all open files in your current directory only:
# lsof +d .
To list all open Internet files:
# lsof -i
To list all files currently open by user joe:
# lsof -u jake
To list all files open by syslog-ng (this is a great quick way to find logs!):
# lsof -c syslog
To list all files open by pid:
# lsof -p PID
List sockets related to port 80
# lsof -i :80
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