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rofi/bin/usedcpu

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+#!/bin/bash
+
+# Source: http://askubuntu.com/a/450136
+
+# I only slightly modify this script to add an option to show icon, useful for my tint2 executor
+# Also useful for polybar custom script, dzen2 feeder, conkybar, lemonbar feeder, dunst notify, etc.
+# 'usedcpu -i' = with icon, 'usedcpu' = text only
+# Cheers!
+# Addy
+
+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"
+  	if  [[ $1 = "-i" ]]; then
+    echo "  ${DIFF_USAGE}%"
+	else
+    echo "${DIFF_USAGE}%"
+	fi
+else
+  	if  [[ $1 = "-i" ]]; then
+    echo "  ?"
+	else
+    echo "?"
+	fi
+fi
+
+# Remember the total and idle CPU times for the next check.
+echo "${TOTAL}" > "${cpuFile}"
+echo "${IDLE}" >> "${cpuFile}"