Linux disk space checking script

Linux disk space information:-

create a shell file with the following script and run it in CRON job
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#!/bin/bash

df -h | grep -vE '^Filesystem|none|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 [ $usep -ge 85 ]; then
    echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" |
     mail -s "Alert: Almost out of disk space $usep%" <mail-id> (your mail id)
  fi
done
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it will send an alert to you mail if disk space reaches 85%.
if you want to set threshold value just place your value at 85.