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#!/bin/bash

#settings:

netspeed=true

ram=true

cpu=true

#-------------------------------------------------------

#---------------- initialize ---------------------------

rm /tmp/.sysmon > /dev/null 2>&1

dstat --net --mem --cpu --output=/tmp/.sysmon 1 1 > /dev/null 2>&1

#----------- up/down speed -----------------------------

if [ $netspeed = true ]; then

upspeed=$(echo $(cat /tmp/.sysmon | tail -1 | cut -d ',' -f2)/1024 | bc)

upkbmb=$(if [ $upspeed -gt 1024 ]; then

up1=$(echo $(cat /tmp/.sysmon | tail -1 | cut -d ',' -f2)/1024/1024 | bc -l)

echo $up1 | head -c 4

else

echo $upspeed | head -c 3

fi)

downspeed=$(echo $(cat /tmp/.sysmon | tail -1 | cut -d ',' -f1)/1024 | bc)

downkbmb=$(if [ $downspeed -gt 1024 ]; then

down1=$(echo $(cat /tmp/.sysmon | tail -1 | cut -d ',' -f1)/1024/1024 | bc -l)

echo $down1 | head -c 4

else

echo $downspeed | head -c 3

fi)

#---------------- up/down speed unit --------------------

downunit=$(if [ $downspeed -gt 1024 ]; then echo "MB/s"; else echo "KB/s"; fi)

upunit=$(if [ $upspeed -gt 1024 ]; then echo "MB/s"; else echo "KB/s"; fi)

fi

#------------------- CPU % used -------------------------

if [ $cpu = true ]; then

cpufree=$(cat /tmp/.sysmon | tail -1 | cut -d ',' -f9)

cpuused=$(echo 100-$cpufree | bc | sed -e 's/\..*//')

fi

#------------------- RAM % used --------------------------

if [ $ram = true ]; then

memused=$(free -m | grep buffers/cache | tr -s ' ' | cut -d' ' -f 3)

memfree=$(free -m | grep buffers/cache | tr -s ' ' | cut -d' ' -f 4)

memtotal=$(echo $memused+$memfree | bc -l)

memusedpercent=$(echo 100-100*$memfree/$memtotal | bc)

fi

#------------------ The Indicator Sysmonitor actual output -

echo $(if [ $cpu = true ]; then echo CPU: $cpuused% \|; fi) $(if [ $ram = true ]; then echo RAM: $memusedpercent% \|; fi) $(if [ $netspeed = true ]; then echo ↓ $downkbmb $downunit ↑ $upkbmb $upunit; fi)

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