Set custom screen resolutions

set_resolution.sh

#!/usr/bin/env bash
# Sets custom screen resolution using xrandr and gtf.
# Usage: sh set_resolution.sh <x_resolution> <y_resolution> <refresh_rate>

# 1080p: sh set_resolution.sh 1920 1080 60
# 1440p: sh set_resolution.sh 2560 1440 60
# Pixelbook: sh set_resolution.sh 2400 1600 60

xres=$1
yres=$2
refresh=$3

gtf_result=`gtf $1 $2 $3 | sed 's/.*Modeline //' | grep \"`
mode_name=`echo $gtf_result | cut -d' ' -f1 | sed 's/"//g'`
mode_config=`echo $gtf_result | cut -d' ' -f2-`

if ! [[ $(xrandr | grep $mode_name) ]]; then
  echo 'creating mode'
  xrandr --newmode $mode_name $mode_config
  xrandr --addmode screen $mode_name
fi

xrandr --output screen --mode $mode_name