# Save this instead of running lsvg over and over
lsvg -o | grep -v "rootvg" > /tmp/$$-lsvg
# "xargs command < filename" roughly equivalent to command `cat filename` but safer 
xargs lsvg -l < /tmp/$$-lsvg | awk '{ print $7 }' | grep -vE "(^$|LV|N/A)" | sort -r > ${LOGFLDR}/tmp_vg.out
{
        while read i
                do
                        umount -f $i
                    if [ $? -ne 0 ]
                       then
                        fuser -kxuc $i
                        umount -f $i
                    fi
                done < ${LOGFLDR}/tmp_vg.out

        while read i
                do
                        varyoffvg $i
               done < /tmp/$$-lsvg

        rm -f /tmp/$$-lsvg
} 1>${LOGFLDR}/FS-status_daily.log 2>&1
if [ $? -eq 0 ]
then
d=`date +"%d-%m-%Y %H:%M"`
echo "Succefully Completed Execution of flashunmount.bash at $d "
unset d
exit 0
else
echo "Error Occured during the execution of flashunmount.bash. Refer the log file created in "${LOGFLDR}""
fi
exit

       fuser  outputs  only  the  PIDs  to  stdout, everything else is sent to
       stderr.

# /tmp/$$-fuser is just a temporary file.  Use whatever name you please.
fuser -c /filesystem 2> /dev/null > /tmp/$$
while read -d ' ' P
do
        echo "PID is $P"
done < /tmp/$$-fuser
rm -f /tmp/$$-fuser