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