This script is very useful for system admins, it checks Cpuload and get info of which process takes the cpuload, if cpuload is or above 70%  it sends alert email to admin

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#!/bin/bash
# Shell script to monitor or watch the high cpu-load
# It will send an email to $ADMIN, if the (cpu load is in %) percentage
# of cpu-load is >= 70%
# If you have any suggestion or question please email to ravi<at>indiangnu <dot> org
# set admin email so that you can get email
# set alert level 70% is default
# you can set it to string LOAD with your value

AWK=/bin/awk
SAR=/usr/bin/sar
GREP=/bin/grep
TR=/usr/bin/tr
HEAD=/usr/bin/head
PS=/bin/ps
SORT=/bin/sort
HOSTNAME=indiangnu.org
SED=/bin/sed
LOAD=70
CAT=/bin/cat
MAILFILE=/tmp/mailviews$$
MAILER=/bin/mail
mailto=”ravi@indiangnu.org”
for path in $PATHS
do
CPU_LOAD=`$SAR -P ALL 1 2 | $GREP ‘Average.*all’ | $AWK -F” ” ‘{ print 100.0 -$NF}’`
echo $CPU_LOAD
if [[ $CPU_LOAD > $LOAD ]];
then
PROC=`$PS -eo pcpu,pid -o comm= | $SORT -k1 -n -r | $HEAD -1`
echo “Please check your processess on ${HOSTNAME} the value of cpu load is $CPU_LOAD % & $PROC” > $MAILFILE
$CAT $MAILFILE | $MAILER -s “CPU Load is $CPU_LOAD % on ${HOSTNAME}” $mailto
fi
done

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After  end of  schedule cron job for this script like below

*/30 * * * * /bin/sh /root/cpuload.sh >/dev/null 2>&1

Thanks

Ravi