cpuScale.sh

#!/bin/sh
# Created By Nate Ober
# Nate [dot] Ober [at] Gmail

LBLUE='\033[0;36m';
DBLUE='\033[0;34m';
BLACK='\033[0;30m';
GREEN='\033[0;32m';
RED='\033[0;31m';
YELLOW='\033[0;33m';
WHITE='\033[0;37m';

LINES=20;
HIGHLIGHT=RED;
SYMBOL="__";

usage()
{
cat << EOF
usage: $0 options

This script will output a series of symbols with the symbol that represents the percent full highlighted in one of several colors. 
I wrote this for use with Geektool. It is best operated in Geektool by using the "dot" convention ". /path/to/script.sh".

OPTIONS:
   -h      Highlight color. The color of the pipe line that indicates percent full. 
		   Options are LBLUE, DBLUE, BLACK, GREEN, RED, YELLOW, WHITE. Default is RED.
		   
   -l      Total number of divisor symbols. Default is 20.
   
   -s      The string to use as a divisor symbol. The default is a "__". (As you might expect, you must surround the string in quotes)
   
EOF
}

while getopts “:h:l:s:” OPTION
do
     case $OPTION in
         h)
             HIGHLIGHT=$(echo "$OPTARG" | tr '[a-z]' '[A-Z]')
             ;;
         l)
             LINES="$OPTARG"
             ;;
    	 s)
             SYMBOL=$(printf '%s' $OPTARG)
             ;;
    	 ?)
             usage
             exit
             ;;
         *)
             usage
             exit
             ;;
     esac
done

if ! [[ "$LINES" =~ ^[0-9]+$ ]] ; then
   	usage
    exit
fi

case $HIGHLIGHT in
	LBLUE)
		HIGHLIGHT=$LBLUE
		;;
	DBLUE)
		HIGHLIGHT=$DBLUE
		;;
	BLACK)
		HIGHLIGHT=$BLACK
		;;
	GREEN)
		HIGHLIGHT=$GREEN
		;;
	RED)
		HIGHLIGHT=$RED
		;;
	YELLOW)
		HIGHLIGHT=$YELLOW
		;;
	WHITE)
		HIGHLIGHT=$WHITE
		;;
	*)
		usage
		exit
		;;
esac
CPUIDLE=`top -l 2 | grep -o '[0-9\.]\{3,5\}% idle' | awk 'NR==2{print}'`;
CPUUSAGE=`echo $CPUIDLE | awk '{printf "%.0f", 100 - $1}'`;
DIVTOT=`echo $CPUIDLE | awk -v lines=$LINES '{printf "%.0f", ($1/100)*lines}'`
echo "$CPUUSAGE%";
for ((i=1;i<$LINES;i++));do 
	if [ $i -ge $DIVTOT ]; then
		echo "$(echo $HIGHLIGHT) $SYMBOL$(echo  '\033[0m')"; 
	else 
		echo " $SYMBOL";
	fi
done
echo "cpu"