easy multisystem PPA add sources list and apt-key

#!/bin/bash
if [ ! "$(grep '^deb http://liveusb.info/multisystem' /etc/apt/sources.list 2>/dev/null)" ]; then
vardeb="## Depôt MultiSystem\ndeb http://liveusb.info/multisystem/depot all main"
echo -e "$vardeb" | tee -a "/etc/apt/sources.list"
fi
#Ajouter clé publique pour apt
sudo -u "$SUDO_USER" wget -q http://liveusb.info/multisystem/depot/multisystem.asc -O- | apt-key add -
#Recharger les sources
apt-get update