Email on diskspace almost full Linux

Create a script file like this one

#vi /scripts/diskalert.sh

#!/bin/sh
df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $6 }' | 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%" stompersly@gmail.com
  fi
done

Add a command to your cron

# crontab -e

 0  7 * * * /scripts/diskAlert.sh

If you need to install mail

# sudo yum install mailx