Shell Programming and Scripting

###########################################
ALERT="50"
ALERT1="85"
DFH=dfh.$$
#DFH=df.$$
DFM=mail.$$
CHK=chk.$$
###########################################
EMAIL=anchal.khare@xyz.com
SUBJECT="WARNING! Disk Usage of $(uname -n)"
MAILPROG=mailx
###########################################

rm -f $DFM
clear
echo
echo `date` | tee $DFM
echo | tee -a $DFM
#df -h > $DFH
cat $DFH | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $6 }' | while read output;
do
  echo "OP is $output"
  USEP=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  )
  FS=$(echo $output | awk '{ print $2 }' )
  echo "USEP is $USEP, FS is $FS"
  if [ $USEP -gt $ALERT ]
  then
  echo "Running out of space \"$FS - ($USEP%)\"" | tee -a $DFM
  fi
done
if test -f $CHK
then
echo "Not Sending an Email"
exit
else
echo Sending an Email
$MAILPROG -s "$SUBJECT" "$EMAIL" < $DFM
echo Creating Tmp File
touch $CHK
fi


## USEP is null here. because of different subshell
## syntx error for if
echo "USEP is $USEP, ALERT1 is $ALERT1"
if [ $USEP -lt $ALERT1 ]
then
echo Removing Tmp File
rm -f $CHK

fi

Mon Mar 15 12:17:58 MET 2010

Running out of space "/d01 - (87%)"
Running out of space "/san - (81%)"
Running out of space "/san00 - (79%)"