http://forums.linuxwebadmin.info/index.php/topic,44.0.htm
Script which will send you email alert when disk space usage is more than 70%:
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#!/bin/bash
usage=`df -h | awk ‘{print $5}’ | sed -e N -e ’s/\n/ /’ | awk ‘{print $2}’ | tr -d % -s “\n”`
devnm=`df -h | awk ‘{print $1}’ | sed -e N -e ’s/\n/ /’ | awk ‘{print $2}’ | tr -s “\n”`
str=”=============================”
if [ $usage -ge 70 ]; then
info=”Disk usage for $devnm is more than 70% , Current Disk usage is $usage % ”
echo -e “$str\n$info\n$str” …