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#!/bin/bash
# by Paul Colby (http://colby.id.au), no rights reserved ;)
# change this with your temporary files
TMP1="/dev/shm/tmp/cpuusage.total"
TMP2="/dev/shm/tmp/cpuusage.idle"
if [ ! -s "$TMP1" ]; then
touch "$TMP1"
echo 0 > "$TMP1"
fi
if [ ! -s "$TMP2" ]; then
touch "$TMP2"
echo 0 > "$TMP2"
fi
#PREV_TOTAL=0
#PREV_IDLE=0
#while true; do
PREV_TOTAL=`cat ${TMP1}`
PREV_IDLE=`cat ${TMP2}`
CPU=(`cat /proc/stat | grep '^cpu '`) # Get the total CPU statistics.
unset CPU[0] # Discard the "cpu" prefix.
IDLE=${CPU[4]} # Get the idle CPU time.
# Calculate the total CPU time.
TOTAL=0
for VALUE in "${CPU[@]}"; do
let "TOTAL=$TOTAL+$VALUE"
done
# Calculate the CPU usage since we last checked.
let "DIFF_IDLE=$IDLE-$PREV_IDLE"
let "DIFF_TOTAL=$TOTAL-$PREV_TOTAL"
let "DIFF_USAGE=(1000*($DIFF_TOTAL-$DIFF_IDLE)/$DIFF_TOTAL+5)/10"
echo -n "$DIFF_USAGE"
# Remember the total and idle CPU times for the next check.
#PREV_TOTAL="$TOTAL"
#PREV_IDLE="$IDLE"
echo $TOTAL > "$TMP1"
echo $IDLE > "$TMP2"
# Wait before checking again.
# sleep 1
#done
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