xrandr force custom resolution

xrandr_force.sh

#!/bin/bash

#Usage: xrandr_force.sh <width>x<height>
#Eg: ./xrander_force.sh 1920x1080

#Just some random defaults
WIDTH=1300
HEIGHT=750

if [ -n "$1" ]; then
    WIDTH=`echo $1 | sed -e 's/x.*//'`
    HEIGHT=`echo $1 | sed -e 's/.*x//'`
fi

#First Screen
S=`xrandr | head -n2  | tail -n1 | sed -e 's/ connected.*//'`

#Generate modeline
L=`cvt ${WIDTH} ${HEIGHT} 60`
NEW_MODE=`echo $L | sed 's/.* Modeline //g' | sed 's/"//g'`

#New Width
NW=`echo $NEW_MODE | awk '{print $3;}'`

#New Height
NH=`echo $NEW_MODE | awk '{print $7;}'`

#Check if mode exists already
let M=`xrandr | grep "${NW}x${NH}_60.00" | wc -l`
if [ $M -eq 0 ]; then
    xrandr --newmode $NEW_MODE
fi

#Add mode to screen
xrandr --addmode $S ${NW}x${NH}_60.00

#Set resolution
xrandr -s ${NW}x${NH}