Computer Tips - How can I kill all processes using a file?

Date: 2009mar31 OS: Linux Q. How can I kill all processes using a file? A. Do this:
fuser -k <file>
It works for a port too:
fuser -k -n tcp 80
If you are running RedHat/Fedora/CentOS and don't have this command, do:
dnf install psmisc