#!/usr/local/bin/bash
FREE=`df -h | grep da0p3 | awk '{print $4}' | sed '{s/.$//;}'`
MIN=1000
TO="email@domain.com"
SBJ="Alarm - free space"
 
echo $FREE
 
if [ $FREE -lt $MIN ]
    then
        echo $FREE | mail -s $SBJ $TO
        echo "Huston, we have a problem!"
    else
        echo "Good!"
fi