GeekTool System Monitor

geektool-sys-monitor.sh

#!/bin/bash
# Modified from:
# http://www.macosxtips.co.uk/geeklets/system/comprehensive-system-monitor-yosemite/

# Make sure you change the following variable 
# to match the network interface you would like to monitor
nic=en3

echo ------- System Information ------

# Find current bandwith in each pipe
myvar1=`netstat -bI ${nic} | awk "/${nic}/"'{print $7;exit}'`
myvar3=`netstat -bI ${nic} | awk "/${nic}/"'{print $10;exit}'`

sleep 1

# Find current bandwith in each pipe after a second.
myvar2=`netstat -bI ${nic} | awk "/${nic}/"'{print $7;exit}'`
myvar4=`netstat -bI ${nic} | awk "/${nic}/"'{print $10;exit}'`

# Find the difference between each pipe after 1 second.
subin=$(($myvar2 - $myvar1))
subout=$(($myvar4 - $myvar3))


# Convert the bytes to kilobytes
kbin=`echo "scale=2; $subin/1024;" | bc`
kbout=`echo "scale=2; $subout/1024;" | bc`

# Current CPU usage
cpu="`ps -A -o %cpu | awk '{s+=$1} END {print s "%"}'`"

# Current Memory Usage
mem="`ps -A -o %mem | awk '{s+=$1} END {print s "%"}'`"

# Current Disk Usage
hdd="`df -h | grep -E "disk1\s+" | awk '{print $3}' | sed 's/Gi$//'` GB"

echo "CPU:$cpu Mem:$mem  Disk:$hdd"
echo

# Current IP Address
# Current Network Traffic
echo "IP address: `ipconfig getifaddr ${nic}`"
echo "Up:$kbout KB/s  Down:$kbin KB/s"
# Current uptime
echo Uptime: `uptime | sed -E "s/^[0-9]+:[0-9]+[[:space:]]+up //" | sed -E "s/, [0-9] users.*//"`
echo

# Install iStats for the following to work:
#     gem install iStats

# Current CPU Temp
istats cpu
# Current Fan speed
istats fan speed
echo
# Battery 
istats battery time
istats battery temp
istats battery charge

# Top 10 processes
echo
echo --------- Top Processes ---------
ps -ecrwwo "command pid %cpu %mem" | head -n 11

Script intended to be called from GeekTool and originally modified from
http://www.macosxtips.co.uk/geeklets/system/comprehensive-system-monitor-yosemite/

Obligatory screenshot:

Font: Source Code Pro

thx 👍