Update Monitor refresh rates from terminal

refrate.sh

#!/bin/bash

function set_refresh_rate(){
    xrandr -d :1 --output $1 --mode $2 --rate $3
}

# update refresh rate for main monitor
set_refresh_rate DP-0 2560x1440 60.00
sleep 0.5
set_refresh_rate DP-0 2560x1440 164.96

# update refresh rate for secondary monitor
set_refresh_rate HDMI-0 1680x1050 60.00
sleep 0.5
set_refresh_rate HDMI-0 1680x1050 74.89

# update refresh rate for primary monitor
set_refresh_rate eDP-1-1 1920x1080 60.00
sleep 0.5
set_refresh_rate eDP-1-1 1920x1080 144.00

# start imwheel daemon
# to make cursor smooth and
# increase scrolling speed
if ! pgrep imwheel >> /dev/null;then
    imwheel >> /dev/null
fi

To control brightness

alias brc="xrandr --output HDMI-0 --brightness"