Simple Disk and Memory Monitor

#!/bin/sh
# Shell script to monitor the disk space,Memory,SWAP Usage and send an email to $ADMIN, if the free avilable percentage of space is >= $ALERT

ADMIN="hareeshvv@gmail.com"
ADMIN1="admin1@mycompany.com"
ADMIN2="admin2@mycompany.com"


# Alert Level Percentage of Disk Usage . Default is 90%
ALERT=90
df -h | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;
do
used=$(echo $output | awk '{ print $1}' | cut -d'%' -f1 )
partition=$(echo $output | awk '{ print $2 }' )
mountpoint=`mount | grep $partition | cut -f3 -d" "`

if [ $used -ge $ALERT ]; then
echo "Running out of space \"$partition ($used%) mounted on $mountpoint\" on $(hostname) as on $(date)" |
mail -s "Alert: Almost out of disk space $used" -c $ADMIN1,$ADMIN2 $ADMIN
fi
done

# Alert on RAM and SWAP Usage

MEM=`free -m | grep Mem | awk -F" " {'print $2'}`
USEDMEM=`free -m | grep Mem | awk -F" " {'print $3'}`
SWAP=`free -m | grep Swap | awk -F" " {'print $2'}`
USEDSWAP=`free -m | grep Swap | awk -F" " {'print $3'}`
echo "Total Memory - $MEM" > /tmp/memorystatus
echo "Used - $USEDMEM" >> /tmp/memorystatus
echo "Total Swap - $SWAP" >> /tmp/memorystatus
echo "Used Swap - $USEDSWAP" >> /tmp/memorystatus
echo "on $(hostname) as on $(date)" >> /tmp/memorystatus

mail -s "Memeory Usage" -c $ADMIN1,$ADMIN2 $ADMIN < /tmp/memorystatus