Monitoring disk space with bash script and get alert on threshhold level

Yesterday I wrote a post when I found a script to monitor disk space in a server and getting alert on thresh hold level. However that script just send a notification when disk space is on thresh hold, but I wanted to get disk usage on daily basis therefore I made some modifications in script.

#!/bin/sh
# Shell script to monitor or watch the disk space
# It will send an email to $ADMIN, if the (free avilable) percentage
# of space is &gt;= 90%
# -------------------------------------------------------------------------
# Copyright (c) 2005 nixCraft project
#--------------------------------------------------------------------------
# Modified by http://WWW.MyliteratureTechLife.com
# Added code to send an email with current usage
# ----------------------------------------------------------------------
# Linux shell script to watch disk space (should work on other UNIX oses )
# SEE URL: http://www.techat.net/shell-script-to-monitor-current-disk-space-and-getting-alert-on-thresh-hold-level/
# set admin email so that you can get email
ADMIN="me@somewher.com"
# set alert level 90% is default
ALERT=90
df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;
do
  #echo $output
  usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  )
  partition=$(echo $output | awk '{ print $2 }' )
  if [ $usep -ge $ALERT ]; then
    echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" |
     mail -s "Alert: Almost out of disk space $usep%" $ADMIN
	 else
	 echo "Still enough space \"$partition ($usep%)\" on $(hostname) as on $(date)" |
     mail -s "Alert: Still enough disk space $usep%" $ADMIN
  fi
done