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#!/bin/bash
# Source: http://askubuntu.com/a/450136
URGENT_VALUE=90
PREV_TOTAL=0
PREV_IDLE=0
cpuFile="/tmp/.cpu"
if [[ -f "${cpuFile}" ]]; then
fileCont=$(cat "${cpuFile}")
PREV_TOTAL=$(echo "${fileCont}" | head -n 1)
PREV_IDLE=$(echo "${fileCont}" | tail -n 1)
fi
CPU=(`cat /proc/stat | grep '^cpu '`) # Get the total CPU statistics.
unset CPU[0] # Discard the "cpu" prefix.
IDLE=${CPU[4]} # Get the idle CPU time.
# Calculate the total CPU time.
TOTAL=0
for VALUE in "${CPU[@]:0:4}"; do
let "TOTAL=$TOTAL+$VALUE"
done
if [[ "${PREV_TOTAL}" != "" ]] && [[ "${PREV_IDLE}" != "" ]]; then
# Calculate the CPU usage since we last checked.
let "DIFF_IDLE=$IDLE-$PREV_IDLE"
let "DIFF_TOTAL=$TOTAL-$PREV_TOTAL"
let "DIFF_USAGE=(1000*($DIFF_TOTAL-$DIFF_IDLE)/$DIFF_TOTAL+5)/10"
echo "${DIFF_USAGE}%"
echo "${DIFF_USAGE}%"
echo ""
else
echo "?"
echo "?"
echo ""
fi
# Remember the total and idle CPU times for the next check.
echo "${TOTAL}" > "${cpuFile}"
echo "${IDLE}" >> "${cpuFile}"
if [[ "${DIFF_USAGE}" -gt 0 ]] && [[ "${DIFF_USAGE}" -gt "${URGENT_VALUE}" ]]; then
exit 33
fi
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