diskcheck.sh

#!/bin/bash

devices=`mount |grep -E '^/dev/' | cut -d ' ' -f 1`
warn_threshold="85"
fail_threshold="90"
status="OK"

for device in ${devices}; do
        diskfree=`df -h ${device} |grep ${device}`
        percent=`echo ${diskfree} |awk '{print $5}' |sed -e 's/%//'`
        free=`echo ${diskfree} |awk '{print $3}' |sed -e 's/%//'`
        total=`echo ${diskfree} |awk '{print $4}' |sed -e 's/%//'`
        if (( $percent > ${fail_threshold} )); then
                echo "FAILURE: ${device} usage is at ${percent}% (${free} free of ${total})"
                status="FAILURE"
        elif (( $percent > ${warn_threshold} )); then
                echo "WARNING: ${device} usage is at ${percent}% (${free} free of ${total})"
                if [ "${status}" == "OK" ]; then
                        status="WARNING"
                fi
        else
                echo "OK: ${device} usage is at ${percent} (${free}% free of ${total})"
        fi
done

if [ "${status}" == "OK" ]; then
        exit 0
elif [ "${status}" == "WARNING" ]; then
        exit 1
elif [ "${status}" == "FAILURE" ]; then
        exit 2
fi