Shell Programming and Scripting

LOAD=75.00
CPU_LOAD= 'sar -P all 300 5 |grep 'Average.all* '| awk -F " " '(print 100.0 -$NF)''
IF [{ $CPU_LOAD > $LOAD ]};
ECHO "pLEASE CHECK YOUR PROCESS ON YOUR $HOSTANME VALUE OF CPU ..." -S MAILX...

#!/bin/bash
CHKFILE=/usr/wrk/CPU.dat
LIMIT=25
CMAX=5
USAGE=$(sar 5 6 | grep "Average")
IDLE=$(echo $USAGE | awk '{printf "%.0d", $8}')

# Read in number of past checks that have exceeded $LIMIT
[ -f $CHKFILE ] && read CPUCNT < $CHKFILE
CPUCNT=${CPUCNT:-0}

[ -z "$IDLE" ] && exit

if (( IDLE < LIMIT ))
then
   ((CPUCNT++))
   ((CPUCNT >= CMAX)) &&
   mailx -s "Sustained high CPU usage: $((100 - IDLE))%" anil@domain.com <<EOF
$(echo $USAGE | awk '{printf "User: %s%%, Nice: %s%%, System: %s%%, I/O Wait: %s%% Steal %s%%\n", $3, $4, $5, $6,$7,$8}')
EOF
else
   ((CPUCNT >= CMAX)) &&
   mailx -s "CPU usage normalised: $((100 - IDLE))%" anil@domain.com <<EOF
$(echo $USAGE | awk '{printf "User: %s%%, Nice: %s%%, System: %s%%, I/O Wait: %s%% Steal %s%%\n", $3, $4, $5, $6,$7,$8}')
   CPUCNT=0
EOF
fi

echo "$CPUCNT" > $CHKFILE