Script to toggle display configuration on a laptop

switchDisplay.sh

#!/bin/sh
# Script to toggle display configuration on a laptop
# authors: Ruben Verhack, ste-fan

config="/tmp/display.conf"
# get output names with `xrandr -q`
external=VGA1
extMode='--mode 800x600'
internal=LVDS1
intMode='--auto'


# Check if config exists
if ! [ -f $config ]; then
    # Empty file executes default
    touch $config
fi
current=`cat $config`
 
# Check if external monitor is connected
if xrandr -q | grep "$external connected"; then
    # Toggle between 2 states
    case "$current" in
        ''|'external')
            # default or was external, now laptop only
            xrandr --output $internal $intMode --output $external --off
            echo "internal" > $config
            ;;
        'internal')
            # was internal, now external only
            xrandr --output $internal --off --output $external $extMode
            echo "external" > $config
            ;;
    esac
    #~ # Toggle between 3 states
    #~ case "$current" in
        #~ ''|'internal')
            #~ # default or was internal, now both
            #~ xrandr --output $internal $intMode --output $external \
                #~ --left-of $internal --output $external $extMode
            #~ echo "dual" > $config
            #~ ;;
        #~ 'dual')
            #~ # was dual, now external only
            #~ xrandr --output $internal --off --output $external $extMode
            #~ echo "external" > $config
            #~ ;;
        #~ 'external')
            #~ # was external, now internal only
            #~ xrandr --output $internal $intMode --output $external --off
            #~ echo "internal" > $config
            #~ ;;
    #~ esac
else
    xrandr --output $internal $intMode
fi