xrandr new mode solution

#!/bin/bash

if [ "$#" != 4 ]; then
  echo "Usage: $0 x y refresh_rate display"
  exit 1
fi

modeline="$(cvt "$1" "$2" "$3" | grep -i '^Modeline')"

modestring="$(<<< "$modeline" cut -d ' ' -f 2-)"
modename="$(<<< "$modestring" sed -n 's/^[^"]*"\([^"]*\)".*/\1/p')"
if [ "$modename" = "" ]; then # Modename not quoted for some reason
  modename="$(<<< "$modestring" cut -d ' ' -f 1)"
fi
modestring="$(<<< "$modestring" tr -d '"')"

xrandr --newmode $modestring # deliberately not in quotes

xrandr --addmode "$4" "$modename"

xrandr --output "$4" --mode "$modename"