Bash script for killing all processes that are using a volume in Mac OS X

free-volume.sh

#!/bin/bash
# This script helps when you're getting this kind of error on a Mac:
#
# "The volume can’t be ejected because it’s currently in use."
#
# Just copy this script to /usr/bin/free-volume or somewhere else you
# want and then call it passing the path to the volume you want 
# to free.
#
# Example: free-volume /Volumes/Iomega_HDD
#
# WARNING: This script kills all process currently using the volume
# so use it at your're own risk when you are sure you aren't performing
# any important operation with the disk and the OS is simple refusing to
# unmount it.
#
# Once you've run it you can safely unmount the volume the usual way.
#

kill -9 `lsof $1/|awk '{ print $2 }'|grep -v PID|sort|uniq|tr '\n' ' '`