#!/bin/bash

# this is a script that warns root about disk partitions reaching the limit

HOSTNAME=`hostname`

# this constant is the max disk usage for a partition
DISK_LIMIT=90

cd
df -h |awk {'print $1"\t"$2"\t"$4"\t"$5"\t"$6'} > /tmp/df.$$

# number of total partitions we have is LINES-2
LINES=`wc -l /tmp/df.$$|awk {'print $1'}`

for ((i = 2;i <= $LINES;i++))
 do
        DISK_SIZE=`head -$i /tmp/df.$$ | tail -1 | awk {'print $4'} | sed 's/\%//g'`
        if [ $DISK_SIZE -ge $DISK_LIMIT ]; then
            MOUNT_POINT=`head -$i /tmp/df.$$ | tail -1 | awk {'print $5'}`
            PARTITION=`head -$i /tmp/df.$$ | tail -1 | awk {'print $1'}`
            echo "$PARTITION ($MOUNT_POINT) is $DISK_SIZE% full" >> /tmp/mail_disksize
        fi
 done

# test if /tmp/mail_disksize is not empty

if [ -s /tmp/mail_disksize ]; then
   mail -s "Warning! Disk partition almost full on $HOSTNAME" varinder@canaca.com, syed@canaca.com, peter@canaca.com < /tmp/mail_disksize
fi

# remove any temp files
rm -f /tmp/df.$$
rm -f /tmp/mail_disksize