Shell script to programmatically list xrandr output modes

list_screen_output_modes.sh

#!/bin/sh

output=""

xrandr | while read line; do
  if echo "${line}" | grep 'connected' > /dev/null; then
    if echo "${line}" | grep ' connected' > /dev/null; then
      output="$( echo "${line}" | sed 's/\(.*\) connected.*/\1/' )"
    fi
  elif ! echo "${line}" | grep '^Screen' > /dev/null; then
    echo "${output}:$( echo "${line}" | awk '{ print $1 }' )"
  fi
done