Monitor SWAP in Linux

create shell script to monitor swap.

#!/bin/bash

cd
. ./.profile

SWAP_THR=70
uname -a |  awk '{print $2}'| read HOST
MAIL_GROUP='vikasthakur232@gmail.com'
df -h swap | awk '{print $5}' | tail -1 | sed 's/.$//'| while read output; do
SWAP_VAR=$(echo $output)
  if [ $SWAP_VAR -gt $SWAP_THR ] ; then
  MESSAGE=${MESSAGE}"Current Swap utilization is $SWAP_VAR percent on $HOME.\n "
  echo -e $MESSAGE | mailx -s "SWAP status on $HOST." $MAIL_GROUP
  fi
done