### autheur: WarLocG ###
### script pour redimensionner l'ecran automatiquement ###

#! /bin/bash
set -u ;

if [ `which xrandr | wc -l` -eq 0 ] ; then
  echo "xrandr not installed or path is missing." ;
  exit ;
fi

commande="xrandr" ; #`which xrandr` ;

#test LVDS, HDMI-0, VGA-0
for iface in "LVDS" "HDMI-0" "VGA-0"; do
  status=`xrandr | grep $iface | awk '{print $2}'` ;
  echo "$iface $status" ;
  if [ $status = "connected" ] ; then
    commande="$commande --output $iface" ;
    mode=`xrandr | grep -b1 $iface | awk '{print $2}' | tail -n-1` ;
    #verification
    if [ `echo $mode | egrep '^[0-9]{3,4}x[0-9]{3,4}$' | wc -l` -eq 0 ] ; then
      echo 'echec du script : abandon' ;
      exit ;
    fi
    commande="$commande --mode $mode"
    if [ $iface = "LVDS" ] ; then commande="$commande --pos 0x0" ;
    else commande="$commande --right-of LVDS" ; fi
  fi
done

echo "commande=$commande"
bash `$commande`

[warlocg][linux][~][12:22:17][user mode]
Enter command here -> sh Desktop/Scripts/dualscreen.sh 
LVDS connected
HDMI-0 disconnected
VGA-0 connected
commande=xrandr --output LVDS --mode 1920x1080 --pos 0x0 --output VGA-0 --mode 1280x1024 --right-of LVDS
[warlocg][linux][~][12:22:26][user mode]
Enter command here ->