file check disk space on server linux

diskspace.sh

#!/bin/bash
# Created by @betapcode - time 05/12/2014
# Check Out of disk space on server
# Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/>
# admin email account - eg: [email protected] [email protected] [email protected]
ADMIN="[email protected]"

# set usage alert threshold - default is 90%
THRESHOLD=90

#hostname
HOSTNAME=$(hostname)

#ipaddress
CMD_GET_IP="$(which ip)"
IPADDR=`$CMD_GET_IP addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1  -d'/'`

#mail client
MAIL="$(which mail)"

# store all disk info here
EMAIL=""

for line in $(df -hP | egrep '^/dev/' | awk '{ print $6 "_:_" $5 }')
do

        part=$(echo "$line" | awk -F"_:_" '{ print $1 }')
        part_usage=$(echo "$line" | awk -F"_:_" '{ print $2 }' | cut -d'%' -f1 )

        if [ $part_usage -ge $THRESHOLD -a -z "$EMAIL" ];
        then
                EMAIL="$(date): Running out of diskspace on $HOSTNAME\n"
                EMAIL="$EMAIL\n$part ($part_usage%) >= (Threshold = $THRESHOLD%)"

        elif [ $part_usage -ge $THRESHOLD ];
        then
                EMAIL="$EMAIL\n$part ($part_usage%) >= (Threshold = $THRESHOLD%)"
        fi
done

if [ -n "$EMAIL" ];
then
        echo -e "$EMAIL" | $MAIL -s "[TT Alert]: In $IPADDR diskspace on $HOSTNAME" "$ADMIN"
fi