Shell Script To Notify Admin User if UNIX / Linux System Load Crossed Certain Limit

#!/bin/bash
#
# Script to notify admin user if Linux,FreeBSD load crossed certain limit
# It will send an email notification to admin.
#
# Copyright 2005 (c) nixCraft project
# This is free script under GNU GPL version 2.0 or above.
# Support/FeedBack/comment :  http://cyberciti.biz/fb/
# Tested os:
# * RedHat Linux
# * Debain Linux
# * FreeBSD
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
 
# Set up limit below
NOTIFY="6.0"
 
# admin user email id
EMAIL="root"
 
# Subject for email
SUBJECT="Alert $(hostname) load average"
 
# -----------------------------------------------------------------
 
# Os Specifc tweaks do not change anything below ;)
OS="$(uname)"
TRUE="1"
if [ "$OS" == "FreeBSD" ]; then
        TEMPFILE="$(mktemp /tmp/$(basename $0).tmp.XXX)"
	FTEXT='load averages:'
elif [ "$OS" == "Linux" ]; then
        TEMPFILE="$(mktemp)"
	FTEXT='load average:'
fi
 
# get first 5 min load
F5M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f1)"
# 10 min
F10M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f2)"
# 15 min
F15M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f3)"
 
# mail message
# keep it short coz we may send it to page or as an short message (SMS)
echo "Load average Crossed allowed limit $NOTIFY." >> $TEMPFILE
echo "Hostname: $(hostname)" >> $TEMPFILE
echo "Local Date & Time : $(date)" >> $TEMPFILE
 
# Look if it crossed limit
# compare it with last 15 min load average
RESULT=$(echo "$F15M > $NOTIFY" | bc)
 
# if so send an email
if [ "$RESULT" == "$TRUE" ]; then
        mail -s "$SUBJECT" "$EMAIL" < $TEMPFILE
fi
 
# remove file
rm -f $TEMPFILE

Tagged as: awk command, basename, bash script, date time, debain linux, email notification, free script, freebsd, linux, linux system, load averages, mail command, mail email, message sms, shell script, short message, support feedback, sysem load, unix linux, uptime command