Shell script to control multiple displays.

m.sh

#!/bin/bash

# check the main display with xrandr and change this accordingly.
MAIN_DP=eDP1

xrandr --output $MAIN_DP --mode 1920x1080

# list of possible displays. (I have a set of adapters, each is addressed with
# a different name)
LIST=$(xrandr | grep connected | cut -d\  -f 1)

function reset_all {
    for OUTPUT in $LIST
    do
        if [ $OUTPUT != $MAIN_DP ]
        then
            xrandr --output $OUTPUT --off
        fi
    done
}

function post_config {
    fbsetbg /home/dmelo/wallpaper/one.jpg
}

case $1 in
    'dual')
        # second monitor at the right side.
        reset_all
        xrandr --addmode $2 1920x1080
        xrandr --output $2 --mode 1920x1080
        xrandr --output $2 --right-of $MAIN_DP
        post_config
        ;;
    'alone')
        # only working with main monitor
        reset_all
        post_config
        ;;
    'record')
        # only one monitor. reduced resolution.
        reset_all
        xrandr --output $2 --mode 1024x768
        ;;
    'clone')
        # mirrored screens
        reset_all
        xrandr --addmode $2 1920x1080
        xrandr --output $2 --mode 1920x1080
        post_config
        ;;
    'home')
        # second monitor placed above main monitor.
        reset_all
        xrandr --addmode $2 1920x1080
        xrandr --output $2 --mode 1920x1080
        xrandr --output $2 --above $MAIN_DP
        post_config
        ;;
    *)
        echo "Usage:"
        echo
        echo "./m.sh MODE DISPLAY"
        echo
        echo "    MODE: dual|alone|record|clone|home"
        echo "    DISPLAY: run xrandr without arguments, to see list of available displays."
        ;;
esac