CPU usage chart for BitBar

real-cpu-usage-chart.10s.sh

#!/bin/bash

# Real CPU Usage Chart
# BitBar plugin
#
# by Marian Schubert
# Based on work by Mat Ryer and Tyler Bunnell
#
# This script requires https://github.com/holman/spark
#
# Calcualtes and displays real CPU usage chart.

IDLE=`top -F -R -l3 | grep "CPU usage" | tail -1 | egrep -o '[0-9]{0,3}\.[0-9]{0,2}% idle' | sed 's/% idle//'`

CURRENT=`echo 100 - $IDLE | bc`

HISTORY_FILE="${HOME}/.cpu.history"
touch "${HISTORY_FILE}"
PREVIOUS=`tail -5 "${HISTORY_FILE}"`
echo "$PREVIOUS" > "${HISTORY_FILE}"
echo $CURRENT >> "${HISTORY_FILE}"

LC_ALL=en_US.UTF-8
CHART=`( cat ${HISTORY_FILE} ; echo 100 ) | /usr/local/bin/spark`
echo ${CHART:1:5}