# umount /mnt/usb/
umount: /mnt/usb: device is busy
umount: /mnt/usb: device is busy

# fuser -mv /dev/sda1

USER PID ACCESS COMMAND
/dev/sda1 root 6968 f.... famd

#!/bin/bash

if [ `whoami` != "root" ]; then
echo "You must run this as root"
exit
fi

dir=$1

# first try unmounting it without doing anything special
testumount=`umount $dir 2>&1`
if [ `echo $testumount | grep "not mounted" | wc -l` -gt 0 ]; then
echo "$1 isn't mounted, exiting"
exit
fi

if [ `echo $testumount | grep busy | wc -l` -gt 0 ]; then
echo "Having trouble, checking famd..."
else
echo "unmounted $dir without any trouble..."
exit
fi

# check famd
if [ `ps -e |grep famd|wc -l` -gt 0 ]; then
/etc/init.d/famd restart
# try unmounting again
if [ `umount $dir 2>&1 | wc -l` -gt 0 ]; then
echo "I tried restarting famd, but that didn't work. checking xinetd"
else
echo "Unmounted $dir by restarting famd"
exit
fi
else
echo "famd isn't running so it couldn't be that.."
fi


# check xinetd
if [ `ps -e | grep xinetd | wc -l` -gt 0 ]; then
/etc/init.d/xinetd stop
# try unmounting again
if [ `umount $dir 2>&1 | wc -l` -lt 1 ]; then
/etc/init.d/xinetd start
echo "Unmounted $1 by restarting xinetd"
exit
fi
/etc/init.d/xinetd start
echo "I tried stopping xinetd, but that didn't work."

else
echo "xinetd isn't running so it couldn't be that.."
fi

echo
echo "I'm going to list processes that are using the folder you are
trying to umount. Answer whether you'd like to kill them or not.
You should look up each process before you answer. use the
following command in a separate shell:"
echo
echo " ps -e | grep <pid>"
echo
echo "where <pid> is the number of the process."
echo
fuser -ki $dir
echo
if [ `echo $testumount | grep busy | wc -l` -gt 0 ]; then
echo "OK, this is the last resort. Do you want to umount the volume using "
echo "the -l option? According to the umount man page -l means:"
echo
echo " Lazy unmount. Detach the filesystem from the filesystem
hierarchy now, and cleanup all references to the filesystem as
soon as it is not busy anymore. (Requires kernel 2.4.11 or later.)"
echo
echo "Use -l option? (y )"
read yn
if [ $yn == "y" ]; then
umount -l $dir
else
echo "OK. Sorry I couldn't help"
fi
else
echo "You're all good "
fi

exit