Snapshot 5 datapoints of CPU Utilization percentage and print the 5th data point for CPU Utilization percentage

cpu_utilization.sh

#!/bin/sh
# by Paul Colby (http://colby.id.au), no rights reserved ;)
# modified by Bakhda, Firesh

PREV_TOTAL=0
PREV_IDLE=0

for INDEX in 1 2 3 4 5; do
  # Get the total CPU statistics, discarding the 'cpu ' prefix.
  CPU=$(sed -n 's/^cpu\s//p' /proc/stat)
  set -- $CPU
  IDLE=$(echo "$CPU" | tr -s " " | cut -d " " -f5)

  for item in "$@"
  do
    TOTAL=$((TOTAL+item))
  done

  # Empty out the array for next iteration
  set --

  #echo "CPU: "$CPU
  #echo "IDLE: "$IDLE
  #echo "TOTAL: "$TOTAL

  # Calculate the CPU usage since we last checked.
  DIFF_IDLE="$((IDLE-PREV_IDLE))"
  DIFF_TOTAL="$((TOTAL-PREV_TOTAL))"
  DIFF_USAGE="$(((1000*(DIFF_TOTAL-DIFF_IDLE)/DIFF_TOTAL+5)/10))"

  #echo "DIFF_TOTAL: "$DIFF_TOTAL
  #echo "DIFF_IDLE: "$DIFF_IDLE
  #echo "DIFF_USAGE: "$DIFF_USAGE

  c=$(echo "$DIFF_TOTAL $DIFF_IDLE" | awk '{printf("%.2f\n",(1000*($1-$2)/$1+5)/10)}')
  USAGE="$USAGE $c"

  # Debug
  #echo "$USAGE"

  # Remember the total and idle CPU times for the next check.
  PREV_TOTAL="$TOTAL"
  PREV_IDLE="$IDLE"
  TOTAL=""

  #echo "PREV_TOTAL: "$PREV_TOTAL
  #echo "PREV_IDLE: "$PREV_IDLE

  # Wait before checking again.
  #echo ""
  sleep 1
done

set -- $USAGE
#echo "USAGE: "$USAGE

echo "$5" | awk '{
    if ($1 < 0)
        printf("A %.2f",0);
    else if ($1 > 100)
        printf("B %.2f",100);
    else
        printf("C %.2f",$1);
}'