i3status Patch to show RAM usage in %

# shell script to add percentage of ram, monitor brightness, and window title to i3status
# needs sed, free, and bc
# showing cpu_usage has to be enabled
# output_format has to be set to "i3bar"

i3status | while :
do
    read line

    # get ram usage in percent
    # you'll need to edit this to match up your total ram
    ram_used="`free -k | sed -n -e '3p' | sed 's/-\/+ buffers\/cache:\s*//' | cut -b 1-7`"
    ram_total="`free -k | sed -n -e '2p' | sed 's/Mem:\s*//' | cut -b 1-7`"
    ram_buffer="`free -k | sed -n -e '2p' | sed 's/Mem:\s*//' | cut -b 46-51`"
    net_ram=`echo $[$ram_total-$ram_buffer]`
    memperc=`echo "$(echo "scale=1; $ram_used * 100 / $net_ram" | bc )"`

    # if used RAM is more than 80% show text in red, else white
    if [ $(echo "$memperc > 75" | bc) -eq 1 ]
    then
        color=FF0000
    else
        color=FFFFFF
    fi

    # add in ram, window brightness, and window title
    sedline="s/cpu_usage/ram_usage\",\"color\":\"\#${color}\",\"full_text\":\"RAM ${memperc}%\"},{\"name\":\"cpu_usage/"

    line=`echo $line | sed -e "$sedline" | sed -e "s/% \"/%\"/"`

    colonline='s/\([a-zA-Z]\):/\1/g'
    final=`echo $line | sed -e "$colonline"`

    echo $final || exit 1
done